EazyTutors - Developer Guide

By: Team W12-4 Since: September 2018 Licence: MIT

1. Setting up
2. Design
3. Implementation
4. Documentation
5. Testing
6. Dev Ops
Appendix A: Suggested Programming Tasks to Get Started
- A.1. Improving each component
- A.2. Creating a new command: remark
Appendix B: Product Scope
Appendix C: User Stories
Appendix D: Use Cases
Appendix E: Non Functional Requirements
Appendix F: Glossary
Appendix G: Instructions for Manual Testing

1. Setting up

1.1. Prerequisites

JDK 9 or later

JDK 10 on Windows will fail to run tests in headless mode due to a JavaFX bug. Windows developers are highly recommended to use JDK 9.
IntelliJ IDE

IntelliJ by default has Gradle and JavaFx plugins installed.
Do not disable them. If you have disabled them, go to File > Settings > Plugins to re-enable them.

1.2. Setting up the project in your computer

Fork this repo, and clone the fork to your computer
Open IntelliJ (if you are not in the welcome screen, click File > Close Project to close the existing project dialog first)
Set up the correct JDK version for Gradle
1. Click Configure > Project Defaults > Project Structure
2. Click New… and find the directory of the JDK
Click Import Project
Locate the build.gradle file and select it. Click OK
Click Open as Project
Click OK to accept the default settings
Open a console and run the command gradlew processResources (Mac/Linux: ./gradlew processResources). It should finish with the BUILD SUCCESSFUL message.
This will generate all resources required by the application and tests.
Open XmlAdaptedPerson.java and MainWindow.java and check for any code errors
1. Due to an ongoing issue with some of the newer versions of IntelliJ, code errors may be detected even if the project can be built and run successfully
2. To resolve this, place your cursor over any of the code section highlighted in red. Press ALT+ENTER, and select Add '--add-modules=…' to module compiler options for each error
Repeat this for the test folder as well (e.g. check XmlUtilTest.java and HelpWindowTest.java for code errors, and if so, resolve it the same way)

1.3. Verifying the setup

Run the seedu.address.MainApp and try a few commands
Run the tests to ensure they all pass.

1.4. Configurations to do before writing code

1.4.1. Configuring the coding style

This project follows oss-generic coding standards. IntelliJ’s default style is mostly compliant with ours but it uses a different import order from ours. To rectify,

Go to File > Settings… (Windows/Linux), or IntelliJ IDEA > Preferences… (macOS)
Select Editor > Code Style > Java
Click on the Imports tab to set the order
- For Class count to use import with '*' and Names count to use static import with '*': Set to 999 to prevent IntelliJ from contracting the import statements
- For Import Layout: The order is import static all other imports, import java.*, import javax.*, import org.*, import com.*, import all other imports. Add a <blank line> between each import

Optionally, you can follow the UsingCheckstyle.adoc document to configure Intellij to check style-compliance as you write code.

1.4.2. Updating documentation to match your fork

After forking the repo, the documentation will still have the SE-EDU branding and refer to the se-edu/addressbook-level4 repo.

If you plan to develop this fork as a separate product (i.e. instead of contributing to se-edu/addressbook-level4), you should do the following:

Configure the site-wide documentation settings in build.gradle, such as the site-name, to suit your own project.
Replace the URL in the attribute repoURL in DeveloperGuide.adoc and UserGuide.adoc with the URL of your fork.

1.4.3. Setting up CI

Set up Travis to perform Continuous Integration (CI) for your fork. See UsingTravis.adoc to learn how to set it up.

After setting up Travis, you can optionally set up coverage reporting for your team fork (see UsingCoveralls.adoc).

Coverage reporting could be useful for a team repository that hosts the final version but it is not that useful for your personal fork.

Optionally, you can set up AppVeyor as a second CI (see UsingAppVeyor.adoc).

Having both Travis and AppVeyor ensures your App works on both Unix-based platforms and Windows-based platforms (Travis is Unix-based and AppVeyor is Windows-based)

1.4.4. Getting started with coding

When you are ready to start coding,

Get some sense of the overall design by reading Section 2.1, “Architecture”.
Take a look at Appendix A, Suggested Programming Tasks to Get Started.

2. Design

2.1. Architecture

Figure 1. Architecture Diagram

The Architecture Diagram given above explains the high-level design of the App. Given below is a quick overview of each component.

The .pptx files used to create diagrams in this document can be found in the diagrams folder. To update a diagram, modify the diagram in the pptx file, select the objects of the diagram, and choose Save as picture.

Main has only one class called MainApp. It is responsible for,

At app launch: Initializes the components in the correct sequence, and connects them up with each other.
At shut down: Shuts down the components and invokes cleanup method where necessary.

Commons represents a collection of classes used by multiple other components. Two of those classes play important roles at the architecture level.

EventsCenter : This class (written using Google’s Event Bus library) is used by components to communicate with other components using events (i.e. a form of Event Driven design)
LogsCenter : Used by many classes to write log messages to the App’s log file.

The rest of the App consists of four components.

UI: The UI of the App.
Logic: The command executor.
Model: Holds the data of the App in-memory.
Storage: Reads data from, and writes data to, the hard disk.

Each of the four components

Defines its API in an interface with the same name as the Component.
Exposes its functionality using a {Component Name}Manager class.

For example, the Logic component (see the class diagram given below) defines it’s API in the Logic.java interface and exposes its functionality using the LogicManager.java class.

Figure 2. Class Diagram of the Logic Component

Events-Driven nature of the design

The Sequence Diagram below shows how the components interact for the scenario where the user issues the command delete 1.

Figure 3. Component interactions for delete 1 command (part 1)

Note how the Model simply raises a AddressBookChangedEvent when the Address Book data are changed, instead of asking the Storage to save the updates to the hard disk.

The diagram below shows how the EventsCenter reacts to that event, which eventually results in the updates being saved to the hard disk and the status bar of the UI being updated to reflect the 'Last Updated' time.

Figure 4. Component interactions for delete 1 command (part 2)

Note how the event is propagated through the EventsCenter to the Storage and UI without Model having to be coupled to either of them. This is an example of how this Event Driven approach helps us reduce direct coupling between components.

The sections below give more details of each component.

2.2. UI component

Figure 5. Structure of the UI Component

API : Ui.java

The UI consists of a MainWindow that is made up of parts e.g.CommandBox, ResultDisplay, PersonListPanel, StatusBarFooter, MoreDetailsPanel etc. All these, including the MainWindow, inherit from the abstract UiPart class.

The UI component uses JavaFx UI framework. The layout of these UI parts are defined in matching .fxml files that are in the src/main/resources/view folder. For example, the layout of the MainWindow is specified in MainWindow.fxml

The UI component,

Executes user commands using the Logic component.
Binds itself to some data in the Model so that the UI can auto-update when data in the Model change.
Responds to events raised from various parts of the App and updates the UI accordingly.

2.3. Logic component

Figure 6. Structure of the Logic Component

API : Logic.java

Logic uses the AddressBookParser class to parse the user command.
This results in a Command object which is executed by the LogicManager.
The command execution can affect the Model (e.g. adding a person) and/or raise events.
The result of the command execution is encapsulated as a CommandResult object which is passed back to the Ui.

Given below is the Sequence Diagram for interactions within the Logic component for the execute("delete 1") API call.

Figure 7. Interactions Inside the Logic Component for the delete 1 Command

2.4. Model component

Figure 8. Structure of the Model Component

API : Model.java

The Model,

stores a UserPref object that represents the user’s preferences.
stores the Address Book data.
exposes an unmodifiable ObservableList<Person> that can be 'observed' e.g. the UI can be bound to this list so that the UI automatically updates when the data in the list change.
does not depend on any of the other three components.

As a more OOP model, we can store a Tag list in Address Book, which Person can reference. This would allow Address Book to only require one Tag object per unique Tag, instead of each Person needing their own Tag object. An example of how such a model may look like is given below.

2.5. Storage component

Figure 9. Structure of the Storage Component

API : Storage.java

The Storage component,

can save UserPref objects in json format and read it back.
can save the Address Book data in xml format and read it back.

2.6. Common classes

Classes used by multiple components are in the seedu.addressbook.commons package.

3. Implementation

This section describes some noteworthy details on how certain features are implemented.

3.1. Undo/Redo feature

3.1.1. Current Implementation

The undo/redo mechanism is facilitated by VersionedAddressBook. It extends AddressBook with an undo/redo history, stored internally as an addressBookStateList and currentStatePointer. Additionally, it implements the following operations:

VersionedAddressBook#commit() — Saves the current address book state in its history.
VersionedAddressBook#undo() — Restores the previous address book state from its history.
VersionedAddressBook#redo() — Restores a previously undone address book state from its history.

These operations are exposed in the Model interface as Model#commitAddressBook(), Model#undoAddressBook() and Model#redoAddressBook() respectively.

Given below is an example usage scenario and how the undo/redo mechanism behaves at each step.

Step 1. The user launches the application for the first time. The VersionedAddressBook will be initialized with the initial address book state, and the currentStatePointer pointing to that single address book state.

Step 2. The user executes delete 5 command to delete the 5th person in the address book. The delete command calls Model#commitAddressBook(), causing the modified state of the address book after the delete 5 command executes to be saved in the addressBookStateList, and the currentStatePointer is shifted to the newly inserted address book state.

Step 3. The user executes add n/David … to add a new person. The add command also calls Model#commitAddressBook(), causing another modified address book state to be saved into the addressBookStateList.

If a command fails its execution, it will not call Model#commitAddressBook(), so the address book state will not be saved into the addressBookStateList.

Step 4. The user now decides that adding the person was a mistake, and decides to undo that action by executing the undo command. The undo command will call Model#undoAddressBook(), which will shift the currentStatePointer once to the left, pointing it to the previous address book state, and restores the address book to that state.

If the currentStatePointer is at index 0, pointing to the initial address book state, then there are no previous address book states to restore. The undo command uses Model#canUndoAddressBook() to check if this is the case. If so, it will return an error to the user rather than attempting to perform the undo.

The following sequence diagram shows how the undo operation works:

The redo command does the opposite — it calls Model#redoAddressBook(), which shifts the currentStatePointer once to the right, pointing to the previously undone state, and restores the address book to that state.

If the currentStatePointer is at index addressBookStateList.size() - 1, pointing to the latest address book state, then there are no undone address book states to restore. The redo command uses Model#canRedoAddressBook() to check if this is the case. If so, it will return an error to the user rather than attempting to perform the redo.

Step 5. The user then decides to execute the command list. Commands that do not modify the address book, such as list, will usually not call Model#commitAddressBook(), Model#undoAddressBook() or Model#redoAddressBook(). Thus, the addressBookStateList remains unchanged.

Step 6. The user executes clear, which calls Model#commitAddressBook(). Since the currentStatePointer is not pointing at the end of the addressBookStateList, all address book states after the currentStatePointer will be purged. We designed it this way because it no longer makes sense to redo the add n/David … command. This is the behavior that most modern desktop applications follow.

The following activity diagram summarizes what happens when a user executes a new command:

3.1.2. Design Considerations

Aspect: How undo & redo executes

Alternative 1 (current choice): Saves the entire address book.
- Pros: Easy to implement.
- Cons: May have performance issues in terms of memory usage.
Alternative 2: Individual command knows how to undo/redo by itself.
- Pros: Will use less memory (e.g. for delete, just save the person being deleted).
- Cons: We must ensure that the implementation of each individual command are correct.

Aspect: Data structure to support the undo/redo commands

Alternative 1 (current choice): Use a list to store the history of address book states.
- Pros: Easy for new Computer Science student undergraduates to understand, who are likely to be the new incoming developers of our project.
- Cons: Logic is duplicated twice. For example, when a new command is executed, we must remember to update both HistoryManager and VersionedAddressBook.
Alternative 2: Use HistoryManager for undo/redo
- Pros: We do not need to maintain a separate list, and just reuse what is already in the codebase.
- Cons: Requires dealing with commands that have already been undone: We must remember to skip these commands. Violates Single Responsibility Principle and Separation of Concerns as HistoryManager now needs to do two different things.

3.2. Sort mechanism

The sort mechanism is reliant on the logic component. The primary sorting algorithm is contained in the 'UniquePersonList' class. It is implemented easily by using a 'Person' comparator.

The 'indicateAddressBookChanged' event is raised by 'Model' after the sorting is done to show that the Address Book has been modified.

The sequence diagram below illustrates how the sort mechanism works:

User executes the sort command which is then parsed through AddressBookParser.
A new sort command is created and it then executes the sort method in ModelManager.
ModelManager calls the internal sorting function in the UniquePersonList class and the person list is sorted.
Lastly, the updateFilteredPersonList() method in ModelManager is called and it then returns the result.

3.2.1. Design Considerations

Aspect: Implementation of `SortCommand`

Alternative 1 (current choice): Only sorts by names of persons in the Address Book.
- Pros: Easy to implement and more intuitive for the user.
- Cons: Functionality is limited and may not satisfy the demands of the user.
Alternative 2: Sorts persons in the Address Book by any field (e.g. sorting by email or tag), which is given as an input by the user.
- Pros: More flexibility for the user since he has the option to sort contacts using more fields.
- Cons: Harder to implement and constant updating of code is required every time a new field in the Person class is introduced.

3.3. Add Profile Photo feature

3.3.1. Current Implementation

The student’s Profile Photo can be viewed at the right side of the student’s profile card.

The following sequence diagram shows how the addphoto command works.

The user inputs the addphoto INDEX f/FILENAME command, with parameters INDEX and FILENAME
The AddressBookParser class parses the command to create a new AddProfilePhotoCommand class.
The AddProfilePhotoCommand command is executed and handled by the ModelManager class.
A new ProfilePhoto object is created, containing the image referenced by FILENAME
The new ProfilePhoto is attached to the Person at INDEX
The new profile photo is displayed

3.3.2. Design Considerations

Aspect: Implementation of AddProfilePhotoCommand

Alternative 1 (current choice): Store the images in a local folder. For Windows, it will be in the AppData folder, for Mac/Linux, in the home folder.
- Pros: After a profile photo is set, it will continue showing even if the image source is deleted.
- Cons: It requires space to store the photos, some images may be too large and consume a lot of memory.
Alternative 2: Not store the image.
- Pros: No space requirement to store the images locally.
- Cons: Need to ensure that the images is not deleted, or it won’t show.
Alternative 1 (current choice): Set a restriction of 5MB for each photo.
- Pros: Prevents a user from crashing the app by putting an image that’s too large in size.
- Cons: Some photos may be larger than 5MB. They can use image compression services to compress it in order to fulfill the limit.
Alternative 2: Not put a specified restriction to the size of profile photo.
- Pros: User can upload image of any size.
- Cons: Performance of the app might be unstable if it contains too many large images.

3.4. Delete Profile Photo feature

3.4.1. Current Implementation

This is a feature which allows a user to delete the profile photo and changes it back to default.

The following sequence diagram shows how the deleteProfilePhoto command works

The user executes the deleteProfilePhoto INDEX command, with parameters INDEX
The AddressBookParser class parses the command to create a new DeleteProfilePhotoCommand class.
The DeleteProfilePhotoCommand command is executed and handled by the ModelManager class.
A new ProfilePhoto object is created, containing the default image.
The new ProfilePhoto is attached to the Person at INDEX.
The default profile photo will now show and the person’s image would be deleted.

3.4.2. Design Considerations

Aspect: Implementation of DeleteProfilePhotoCommand

Alternative 1 (current choice): Create a new ProfilePhoto object.
- Pros: Easier if developer decides to change the path of the default photo, or the properties of the ProfilePhotoclass.
- Cons: Creating a new object each time might be highly memory-consuming, but probably insignificant on a modern PC.

3.5. Assignment and Attendance data structure

3.5.1. Assignment data structure

Global information about assignment is stored in addressbook level and each assignment have a uniqueId that will not change when the assignment is edited. Also every student store a map with assignment uniqueId as key and mark obtained as value.

Design Considerations

Aspect: Data Structure to support assignment operations

Alternative 1 (current choice): Use a hashmap of uniqueId to mark to store assignment score of each student.
- Pros: Flexibility to edit assignment without having to do any operation on each student.
- Cons: Any functionality that needs to iterate through all assignment score for a student must first iterate through UniqueAssignmentList to know which score belongs to which assignment.
Alternative 2: Store all assignment information on each student.
- Pros: Easy to implement. All method that wants to read a student assignment information including score only need to read 1 student.
- Cons: Requires more memory since every assignment is stored in every student. Harder to edit assignment since we must edit assignment information in every single student.

3.5.2. Attendance data structure

Provides a representation of an attendance session for a particular date. This enables a mapping between each student and multiple attendance sessions with a record of attendance/absence for that session.

Design Considerations

Aspect: Data Structure to support attendance operations

Structure of the Model Component including the Attendance data structure

Alternative 1 (current choice): Adaptation of Assignment model, using a HashMap for each student to record the attendance/absence with the uniqueId of the Attendance session. AttendanceMark is a subclass of the Mark class from the Assignment model, limited to a value of 1 or 0. The Attendance session date is represented with the Deadline class from the Assignment model.
- Pros: Limited code duplication, consistent model implementation, prevents inconsistent attendance records across the class.
- Cons: Calculating attendance requires iterating and mapping.
Alternative 2: Store a list of attendance marks for each student.
- Pros: Higher cohesion with attendance data represented together with student.
- Cons: Attendance session data is distributed across all students which increases complexity of operations affecting all students.

3.6. Edit Assignment Feature

This is a feature to let user edit an assignment name, weight, maximum mark, and deadline.

The following sequence diagram shows how the editAssignment command works

The user executes the editAssignment INDEX [n/ASSIGNMENTNAME] [w/WEIGTH] [d/DEADLINE] [m/MAXMARK] command, with parameters INDEX and optional parameters ASSIGNMENTNAME, WEIGHT, DEADLINE, MAXMARK.
The AddressBookParser class parses the command to create a new EditAssignmentCommand class.
The getFilteredAssignmentList command is executed and handled by the ModelManager class.
A new Assignment object is created by createEditedAssignment command, using information parsed from parser.
The new Assignment is attached to the Model at INDEX.
The new assignment information will now stored.

3.7. Edit Lesson Feature

This is a feature to let users edit the name and date of a lesson.

The following sequence diagram shows how the editLesson command works

The user executes the editLesson id/SESSION_INDEX n/UPDATED_NAME d/UPDATED_DATE command, with parameters SESSION_INDEX and optional parameters UPDATED_NAME, UPDATED_DATE.
The AddressBookParser class parses the command to create a new EditLessonCommand class.
The getFilteredAttendanceList command is executed and handled by the ModelManager class.
A new Attendance object is created by createEditedAttendance command, using information parsed from parser.
The new Attendance is attached to the Model at SESSION_INDEX.
The new lesson information will now stored.

3.8. Delete Attendance Feature

This is a feature to let users remove a lesson from the address book.

The following sequence diagram shows how the deleteAttendance command works

The user executes the deleteAttendance id/SESSION_INDEX command, with parameter SESSION_INDEX.
The AddressBookParser class parses the command to create a new deleteAttendanceCommand class.
The getFilteredAttendanceList command is executed and handled by the ModelManager class.
The target Attendance object is removed by createEditedAttendance command, using information parsed from parser.
The target lesson information will now be removed.

3.9. Add Lesson Feature

This is a feature to let users add a lesson to the address book.

The following sequence diagram shows how the addLesson command works

The user executes the addLesson n/NAME d/DATE command, with parameters NAME, DATE.
The AddressBookParser class parses the command to create a new AddAttendanceCommand class.
The getFilteredAttendanceList command is executed and handled by the ModelManager class.
A new Attendance object is created using information parsed from parser.
The new Attendance is attached to the Model.
The new lesson information will now stored.

3.10. UI-Model binding of student details

3.10.1. Current Implementation

The data MoreDetailsPanel binds itself to are filteredPersons and filteredAssignments in the Model class.

filteredPersons — Current students (filtered by find command) stored in the database.
filteredAssignments — The names of all the assignments that the students have in the database.

MoreDetailsPanel will be notified by any changes in the data when a related event is raised, such as PersonPanelSelectionChangedEvent. It will then retrieve the new student’s marks and note using filteredPersons and display them with reference to their names in filteredAssignments.

3.11. Note data structure

3.11.1. Current Implementation

A Note stores a String text (content of the note). text is final and never changed once initialized. When a note or editnote command is executed, a new Note is created with the final text. The methods in the Note class return a new Note object with the new text.

3.11.2. Design considerations

Aspect: Note auto-punctuation

Alternative 1(current choice): Note texts are automatically ended with a full stop (.) if it is not added by the user, unless the user ends the text with ! or ?. When a note or editnote command is executed on a Note that already has text, the previous text’s punctuation is changed to a comma (,) instead before being added to the final text.

The workflow for this algorithm is shown below. Text refers to the text being added, noteText refers to the existing text in the Note and newText refers to the final text in the newly created Note.

Figure 10. Activity Diagram for Text Addition
- Pros:
  - Note text is standardized without the user having to bother about doing so in their input.
- Cons:
  - If the user wishes to end their notes with other punctuation such as ! or ?, the user has to add it into their input.
  - Other special characters used to end sentences will not be detected and a full stop will be added to them.
  - Developers have to manually add special characters to be checked for.
Alternative 2: No editing of Note text, text will be whatever the user inputs.
- Pros:
  - Easy to implement, there is no need to check text input.
  - User flexibility in what they want their text to end with.
- Cons:
  - User has to take more care in adding Note text in their input.

Aspect: Edit note implementation

Alternative 1 (current choice): Delete the note, before adding it using note command. As deleting the note is similar in both delnote and editnote, they implement the NoteDeleter interface with has a default method copyWithoutNote to reduce repeated code.

Figure 11. Structure of Note commands (only classes closely related to EditNoteCommand shown)

An example of how the editnote command would work is depicted in the sequence diagram below. NoteCommand is minimally represented for brevity.

Figure 12. Sequence Diagram of EditNoteCommand executing (only relevant methods are shown)
- Pros:
  - Easier to implement.
  - Adapts with any changes to the NoteCommand without needing to update.
- Cons:
  - Some overhead accrued due to NoteCommand object creation.
  - Dependency between EditNoteCommand and NoteCommand.

Alternative 2: Implement a separate edit note command.
- Pros:
  - Command will be able to work on its own.
- Cons:
  - Some repeated code with NoteCommand.

3.12. Assignment Statistics feature

3.12.1. Current Implementation

The Mark objects associated with the Assignment are obtained by filtering the Mark HashMap using the assignment unique id as the key, for each Person in the addressbook. The maximum, minimum, and average marks are calculated by the DoubleSummaryStatistics object. The median, 25th, and 75th percentiles are calculated by indexing a sorted array of the Mark values.

Figure 13. Sequence diagram of the Assignment Statistics feature

3.12.2. Design Considerations

Aspect: Specification of the Assignment Model

Alternative 1 (current choice): Use a stream to filter the Mark objects associated with the Assignment.
- Pros: Implementation follows specification of the Assignment Model.
- Cons: Mark objects are associated with Person objects, thus requiring several linear operations to obtain all Mark objects associated with one Assignment.
Alternative 2: Create a new mapping between Mark objects and each Assignment.
- Pros: Mark objects can be aggregated over time, eliminating the need to filter each time.
- Cons: Major changes to the specification of the Assignment Model.

3.13. Class Statistics feature

3.13.1. Current Implementation

For each Person in the addressbook, the associated Mark objects are cross-referenced using the unique id for each Assignment to calculate the grade of each assignment to obtain the weighted overall grade of each student. The maximum, minimum, and average marks are calculated by the DoubleSummaryStatistics object. The median, 25th, and 75th percentiles are calculated by indexing a sorted array of the overall grades.

Figure 14. Sequence diagram of the Class Statistics feature

3.13.2. Design Considerations

Aspect: Specification of the Assignment Model

Alternative 1 (current choice): Use a stream to group the Mark objects by association with each Person and calculate the overall grade using the relevant Assignment objects for each Mark.
- Pros: Implementation follows specification of the Assignment Model.
- Cons: Several linear operations must be performed to bridge the association between each Mark, Assignment, and Person.
Alternative 2: Create a class data structure to record the data for the entire class.
- Pros: Calculations may be performed within the data structure.
- Cons: Increased operations for each change in data due to high coupling between Mark, Assignment, and Person.

3.14. Grade Display feature

3.14.1. Current Implementation

The information for each Assignment object in the addressbook is listed, including the the index number, name, deadline, weight, mark, and maximum mark.
The mark is obtained from the Mark associated with the selected Person object.
The total grade for the student is calculated as a weighted sum of the marks for all the assignments and listed below.

Figure 15. Grade Display

3.14.2. Design Considerations

Aspect: Evaluation of total grade for the student

Alternative 1 (current choice): Calculate the total grade on demand.
- Pros: Implementation does not require additional models.
- Cons: The calculation is linear and must bbe performed every time the student is selected.
Alternative 2: Create a new model to aggregate the total grade.
- Pros: The total grade is readily available and may be used elsewhere in the application.
- Cons: Increased operations for each change in data to update the total grade.

3.15. Logging

We are using java.util.logging package for logging. The LogsCenter class is used to manage the logging levels and logging destinations.

The logging level can be controlled using the logLevel setting in the configuration file (See Section 3.16, “Configuration”)
The Logger for a class can be obtained using LogsCenter.getLogger(Class) which will log messages according to the specified logging level
Currently log messages are output through: Console and to a .log file.

Logging Levels

SEVERE : Critical problem detected which may possibly cause the termination of the application
WARNING : Can continue, but with caution
INFO : Information showing the noteworthy actions by the App
FINE : Details that is not usually noteworthy but may be useful in debugging e.g. print the actual list instead of just its size

3.16. Configuration

Certain properties of the application can be controlled (e.g App name, logging level) through the configuration file (default: config.json).

4. Documentation

We use asciidoc for writing documentation.

We chose asciidoc over Markdown because asciidoc, although a bit more complex than Markdown, provides more flexibility in formatting.

4.1. Editing Documentation

See UsingGradle.adoc to learn how to render .adoc files locally to preview the end result of your edits. Alternatively, you can download the AsciiDoc plugin for IntelliJ, which allows you to preview the changes you have made to your .adoc files in real-time.

4.2. Publishing Documentation

See UsingTravis.adoc to learn how to deploy GitHub Pages using Travis.

4.3. Converting Documentation to PDF format

We use Google Chrome for converting documentation to PDF format, as Chrome’s PDF engine preserves hyperlinks used in webpages.

Here are the steps to convert the project documentation files to PDF format.

Follow the instructions in UsingGradle.adoc to convert the AsciiDoc files in the docs/ directory to HTML format.
Go to your generated HTML files in the build/docs folder, right click on them and select Open with → Google Chrome.
Within Chrome, click on the Print option in Chrome’s menu.
Set the destination to Save as PDF, then click Save to save a copy of the file in PDF format. For best results, use the settings indicated in the screenshot below.

Figure 16. Saving documentation as PDF files in Chrome

4.4. Site-wide Documentation Settings

The build.gradle file specifies some project-specific asciidoc attributes which affects how all documentation files within this project are rendered.

Attributes left unset in the build.gradle file will use their default value, if any.

Table 1. List of site-wide attributes
Attribute name	Description	Default value
`site-name`	The name of the website. If set, the name will be displayed near the top of the page.	not set
`site-githuburl`	URL to the site’s repository on GitHub. Setting this will add a "View on GitHub" link in the navigation bar.	not set
`site-seedu`	Define this attribute if the project is an official SE-EDU project. This will render the SE-EDU navigation bar at the top of the page, and add some SE-EDU-specific navigation items.	not set

4.5. Per-file Documentation Settings

Each .adoc file may also specify some file-specific asciidoc attributes which affects how the file is rendered.

Asciidoctor’s built-in attributes may be specified and used as well.

Attributes left unset in .adoc files will use their default value, if any.

Table 2. List of per-file attributes, excluding Asciidoctor’s built-in attributes
Attribute name	Description	Default value
`site-section`	Site section that the document belongs to. This will cause the associated item in the navigation bar to be highlighted. One of: `UserGuide`, `DeveloperGuide`, `LearningOutcomes`, `AboutUs`, `ContactUs` Official SE-EDU projects only	not set
`no-site-header`	Set this attribute to remove the site navigation bar.	not set

4.6. Site Template

The files in docs/stylesheets are the CSS stylesheets of the site. You can modify them to change some properties of the site’s design.

The files in docs/templates controls the rendering of .adoc files into HTML5. These template files are written in a mixture of Ruby and Slim.

Modifying the template files in docs/templates requires some knowledge and experience with Ruby and Asciidoctor’s API. You should only modify them if you need greater control over the site’s layout than what stylesheets can provide. The SE-EDU team does not provide support for modified template files.

5. Testing

5.1. Running Tests

There are three ways to run tests.

The most reliable way to run tests is the 3rd one. The first two methods might fail some GUI tests due to platform/resolution-specific idiosyncrasies.

Method 1: Using IntelliJ JUnit test runner

To run all tests, right-click on the src/test/java folder and choose Run 'All Tests'
To run a subset of tests, you can right-click on a test package, test class, or a test and choose Run 'ABC'

Method 2: Using Gradle

Open a console and run the command gradlew clean allTests (Mac/Linux: ./gradlew clean allTests)

See UsingGradle.adoc for more info on how to run tests using Gradle.

Method 3: Using Gradle (headless)

Thanks to the TestFX library we use, our GUI tests can be run in the headless mode. In the headless mode, GUI tests do not show up on the screen. That means the developer can do other things on the Computer while the tests are running.

To run tests in headless mode, open a console and run the command gradlew clean headless allTests (Mac/Linux: ./gradlew clean headless allTests)

5.2. Types of tests

We have two types of tests:

GUI Tests - These are tests involving the GUI. They include,
1. System Tests that test the entire App by simulating user actions on the GUI. These are in the systemtests package.
2. Unit tests that test the individual components. These are in seedu.address.ui package.
Non-GUI Tests - These are tests not involving the GUI. They include,
1. Unit tests targeting the lowest level methods/classes.
  e.g. seedu.address.commons.StringUtilTest
2. Integration tests that are checking the integration of multiple code units (those code units are assumed to be working).
  e.g. seedu.address.storage.StorageManagerTest
3. Hybrids of unit and integration tests. These test are checking multiple code units as well as how the are connected together.
  e.g. seedu.address.logic.LogicManagerTest

5.3. Troubleshooting Testing

Problem: HelpWindowTest fails with a NullPointerException.

Reason: One of its dependencies, HelpWindow.html in src/main/resources/docs is missing.
Solution: Execute Gradle task processResources.

6. Dev Ops

6.1. Build Automation

See UsingGradle.adoc to learn how to use Gradle for build automation.

6.2. Continuous Integration

We use Travis CI and AppVeyor to perform Continuous Integration on our projects. See UsingTravis.adoc and UsingAppVeyor.adoc for more details.

6.3. Coverage Reporting

We use Coveralls to track the code coverage of our projects. See UsingCoveralls.adoc for more details.

6.4. Documentation Previews

When a pull request has changes to asciidoc files, you can use Netlify to see a preview of how the HTML version of those asciidoc files will look like when the pull request is merged. See UsingNetlify.adoc for more details.

6.5. Making a Release

Here are the steps to create a new release.

Update the version number in MainApp.java.
Generate a JAR file using Gradle.
Tag the repo with the version number. e.g. v0.1
Create a new release using GitHub and upload the JAR file you created.

6.6. Managing Dependencies

A project often depends on third-party libraries. For example, Address Book depends on the Jackson library for XML parsing. Managing these dependencies can be automated using Gradle. For example, Gradle can download the dependencies automatically, which is better than these alternatives.
a. Include those libraries in the repo (this bloats the repo size)
b. Require developers to download those libraries manually (this creates extra work for developers)

Appendix A: Suggested Programming Tasks to Get Started

Suggested path for new programmers:

First, add small local-impact (i.e. the impact of the change does not go beyond the component) enhancements to one component at a time. Some suggestions are given in Section A.1, “Improving each component”.
Next, add a feature that touches multiple components to learn how to implement an end-to-end feature across all components. Section A.2, “Creating a new command: remark” explains how to go about adding such a feature.

A.1. Improving each component

Each individual exercise in this section is component-based (i.e. you would not need to modify the other components to get it to work).

`Logic` component

Scenario: You are in charge of logic. During dog-fooding, your team realize that it is troublesome for the user to type the whole command in order to execute a command. Your team devise some strategies to help cut down the amount of typing necessary, and one of the suggestions was to implement aliases for the command words. Your job is to implement such aliases.

Do take a look at Section 2.3, “Logic component” before attempting to modify the Logic component.

Add a shorthand equivalent alias for each of the individual commands. For example, besides typing clear, the user can also type c to remove all persons in the list.
- Hints
  
  Just like we store each individual command word constant COMMAND_WORD inside *Command.java (e.g. FindCommand#COMMAND_WORD, DeleteCommand#COMMAND_WORD), you need a new constant for aliases as well (e.g. FindCommand#COMMAND_ALIAS).
  
  AddressBookParser is responsible for analyzing command words.
- Solution
  
  Modify the switch statement in AddressBookParser#parseCommand(String) such that both the proper command word and alias can be used to execute the same intended command.
  
  Add new tests for each of the aliases that you have added.
  
  Update the user guide to document the new aliases.
  
  See this PR for the full solution.

`Model` component

Scenario: You are in charge of model. One day, the logic-in-charge approaches you for help. He wants to implement a command such that the user is able to remove a particular tag from everyone in the address book, but the model API does not support such a functionality at the moment. Your job is to implement an API method, so that your teammate can use your API to implement his command.

Do take a look at Section 2.4, “Model component” before attempting to modify the Model component.

Add a removeTag(Tag) method. The specified tag will be removed from everyone in the address book.
- Hints
  
  The Model and the AddressBook API need to be updated.
  
  Think about how you can use SLAP to design the method. Where should we place the main logic of deleting tags?
  
  Find out which of the existing API methods in AddressBook and Person classes can be used to implement the tag removal logic. AddressBook allows you to update a person, and Person allows you to update the tags.
- Solution
  
  Implement a removeTag(Tag) method in AddressBook. Loop through each person, and remove the tag from each person.
  
  Add a new API method deleteTag(Tag) in ModelManager. Your ModelManager should call AddressBook#removeTag(Tag).
  
  Add new tests for each of the new public methods that you have added.
  
  See this PR for the full solution.

`Ui` component

Scenario: You are in charge of ui. During a beta testing session, your team is observing how the users use your address book application. You realize that one of the users occasionally tries to delete non-existent tags from a contact, because the tags all look the same visually, and the user got confused. Another user made a typing mistake in his command, but did not realize he had done so because the error message wasn’t prominent enough. A third user keeps scrolling down the list, because he keeps forgetting the index of the last person in the list. Your job is to implement improvements to the UI to solve all these problems.

Do take a look at Section 2.2, “UI component” before attempting to modify the UI component.

Use different colors for different tags inside person cards. For example, friends tags can be all in brown, and colleagues tags can be all in yellow.

Before

After
- Hints
  
  The tag labels are created inside the PersonCard constructor (new Label(tag.tagName)). JavaFX’s Label class allows you to modify the style of each Label, such as changing its color.
  
  Use the .css attribute -fx-background-color to add a color.
  
  You may wish to modify DarkTheme.css to include some pre-defined colors using css, especially if you have experience with web-based css.
- Solution
  
  You can modify the existing test methods for PersonCard 's to include testing the tag’s color as well.
  
  See this PR for the full solution.
  
  The PR uses the hash code of the tag names to generate a color. This is deliberately designed to ensure consistent colors each time the application runs. You may wish to expand on this design to include additional features, such as allowing users to set their own tag colors, and directly saving the colors to storage, so that tags retain their colors even if the hash code algorithm changes.
Modify NewResultAvailableEvent such that ResultDisplay can show a different style on error (currently it shows the same regardless of errors).

Before

After
- Hints
  
  NewResultAvailableEvent is raised by CommandBox which also knows whether the result is a success or failure, and is caught by ResultDisplay which is where we want to change the style to.
  
  Refer to CommandBox for an example on how to display an error.
- Solution
  
  Modify NewResultAvailableEvent 's constructor so that users of the event can indicate whether an error has occurred.
  
  Modify ResultDisplay#handleNewResultAvailableEvent(NewResultAvailableEvent) to react to this event appropriately.
  
  You can write two different kinds of tests to ensure that the functionality works:
  
  The unit tests for ResultDisplay can be modified to include verification of the color.
  
  The system tests AddressBookSystemTest#assertCommandBoxShowsDefaultStyle() and AddressBookSystemTest#assertCommandBoxShowsErrorStyle() to include verification for ResultDisplay as well.
  
  See this PR for the full solution.
  
  Do read the commits one at a time if you feel overwhelmed.
Modify the StatusBarFooter to show the total number of people in the address book.

Before

After
- Hints
  
  StatusBarFooter.fxml will need a new StatusBar. Be sure to set the GridPane.columnIndex properly for each StatusBar to avoid misalignment!
  
  StatusBarFooter needs to initialize the status bar on application start, and to update it accordingly whenever the address book is updated.
- Solution
  
  Modify the constructor of StatusBarFooter to take in the number of persons when the application just started.
  
  Use StatusBarFooter#handleAddressBookChangedEvent(AddressBookChangedEvent) to update the number of persons whenever there are new changes to the addressbook.
  
  For tests, modify StatusBarFooterHandle by adding a state-saving functionality for the total number of people status, just like what we did for save location and sync status.
  
  For system tests, modify AddressBookSystemTest to also verify the new total number of persons status bar.
  
  See this PR for the full solution.

`Storage` component

Scenario: You are in charge of storage. For your next project milestone, your team plans to implement a new feature of saving the address book to the cloud. However, the current implementation of the application constantly saves the address book after the execution of each command, which is not ideal if the user is working on limited internet connection. Your team decided that the application should instead save the changes to a temporary local backup file first, and only upload to the cloud after the user closes the application. Your job is to implement a backup API for the address book storage.

Do take a look at Section 2.5, “Storage component” before attempting to modify the Storage component.

Add a new method backupAddressBook(ReadOnlyAddressBook), so that the address book can be saved in a fixed temporary location.
- Hint
  
  Add the API method in AddressBookStorage interface.
  
  Implement the logic in StorageManager and XmlAddressBookStorage class.
- Solution
  
  See this PR for the full solution.

A.2. Creating a new command: `remark`

By creating this command, you will get a chance to learn how to implement a feature end-to-end, touching all major components of the app.

Scenario: You are a software maintainer for addressbook, as the former developer team has moved on to new projects. The current users of your application have a list of new feature requests that they hope the software will eventually have. The most popular request is to allow adding additional comments/notes about a particular contact, by providing a flexible remark field for each contact, rather than relying on tags alone. After designing the specification for the remark command, you are convinced that this feature is worth implementing. Your job is to implement the remark command.

A.2.1. Description

Edits the remark for a person specified in the INDEX.
Format: remark INDEX r/[REMARK]

Examples:

remark 1 r/Likes to drink coffee.
Edits the remark for the first person to Likes to drink coffee.
remark 1 r/
Removes the remark for the first person.

A.2.2. Step-by-step Instructions

[Step 1] Logic: Teach the app to accept 'remark' which does nothing

Let’s start by teaching the application how to parse a remark command. We will add the logic of remark later.

Main:

Add a RemarkCommand that extends Command. Upon execution, it should just throw an Exception.
Modify AddressBookParser to accept a RemarkCommand.

Tests:

Add RemarkCommandTest that tests that execute() throws an Exception.
Add new test method to AddressBookParserTest, which tests that typing "remark" returns an instance of RemarkCommand.

[Step 2] Logic: Teach the app to accept 'remark' arguments

Let’s teach the application to parse arguments that our remark command will accept. E.g. 1 r/Likes to drink coffee.

Main:

Modify RemarkCommand to take in an Index and String and print those two parameters as the error message.
Add RemarkCommandParser that knows how to parse two arguments, one index and one with prefix 'r/'.
Modify AddressBookParser to use the newly implemented RemarkCommandParser.

Tests:

Modify RemarkCommandTest to test the RemarkCommand#equals() method.
Add RemarkCommandParserTest that tests different boundary values for RemarkCommandParser.
Modify AddressBookParserTest to test that the correct command is generated according to the user input.

[Step 3] Ui: Add a placeholder for remark in `PersonCard`

Let’s add a placeholder on all our PersonCard s to display a remark for each person later.

Main:

Add a Label with any random text inside PersonListCard.fxml.
Add FXML annotation in PersonCard to tie the variable to the actual label.

Tests:

Modify PersonCardHandle so that future tests can read the contents of the remark label.

[Step 4] Model: Add `Remark` class

We have to properly encapsulate the remark in our Person class. Instead of just using a String, let’s follow the conventional class structure that the codebase already uses by adding a Remark class.

Main:

Add Remark to model component (you can copy from Address, remove the regex and change the names accordingly).
Modify RemarkCommand to now take in a Remark instead of a String.

Tests:

Add test for Remark, to test the Remark#equals() method.

[Step 5] Model: Modify `Person` to support a `Remark` field

Now we have the Remark class, we need to actually use it inside Person.

Main:

Add getRemark() in Person.
You may assume that the user will not be able to use the add and edit commands to modify the remarks field (i.e. the person will be created without a remark).
Modify SampleDataUtil to add remarks for the sample data (delete your addressBook.xml so that the application will load the sample data when you launch it.)

[Step 6] Storage: Add `Remark` field to `XmlAdaptedPerson` class

We now have Remark s for Person s, but they will be gone when we exit the application. Let’s modify XmlAdaptedPerson to include a Remark field so that it will be saved.

Main:

Add a new Xml field for Remark.

Tests:

Fix invalidAndValidPersonAddressBook.xml, typicalPersonsAddressBook.xml, validAddressBook.xml etc., such that the XML tests will not fail due to a missing <remark> element.

[Step 6b] Test: Add withRemark() for `PersonBuilder`

Since Person can now have a Remark, we should add a helper method to PersonBuilder, so that users are able to create remarks when building a Person.

Tests:

Add a new method withRemark() for PersonBuilder. This method will create a new Remark for the person that it is currently building.
Try and use the method on any sample Person in TypicalPersons.

[Step 7] Ui: Connect `Remark` field to `PersonCard`

Our remark label in PersonCard is still a placeholder. Let’s bring it to life by binding it with the actual remark field.

Main:

Modify PersonCard's constructor to bind the Remark field to the Person 's remark.

Tests:

Modify GuiTestAssert#assertCardDisplaysPerson(…) so that it will compare the now-functioning remark label.

[Step 8] Logic: Implement `RemarkCommand#execute()` logic

We now have everything set up… but we still can’t modify the remarks. Let’s finish it up by adding in actual logic for our remark command.

Main:

Replace the logic in RemarkCommand#execute() (that currently just throws an Exception), with the actual logic to modify the remarks of a person.

Tests:

Update RemarkCommandTest to test that the execute() logic works.

A.2.3. Full Solution

See this PR for the step-by-step solution.

Appendix B: Product Scope

Target user profile:

Tutors or teachers

Value proposition:

Our application helps lecturers/tutors manage simple administrative tasks such as:
- Tracking student’s attendance
- Tracking student’s academic performance
- Tracking student’s participation in lessons
- Tracking student’s profile

Appendix C: User Stories

Priorities: High (must have) - * * *, Medium (nice to have) - * *, Low (unlikely to have) - *

Priority As a … I want to … So that I can…

Priority	As a …	I want to …	So that I can…
`* * *`	tutor	monitor the attendance level of each student	allocate attendance marks accordingly
`* * *`	busy tutor	mark attendance using this app	forgo manually marking on a copy of the class list
`* * *`	tutor	monitor the assignment submissions of each student	keep track of who has submitted and who has not
`* * *`	concerned tutor	monitor the test scores of all my students taking the module	identify the weaker students who need more help
`* * *`	tutor	input student assignment scores	keep track of them
`* * *`	tutor	record participation marks of each student in tutorial	effectively keep track without tedious manual documentation
`* *`	tutor	review student’s feedback of me	improve my lessons
`* *`	tutor	quickly sort and identify which student needs help	customise my teaching to each student
`*`	tutor	view my students’ images	identify them during class
`*`	tutor	send automatic reminders to students who have not submitted their assignments	ensure they will not miss out on learning
`*`	tutor	calculate the average, median, and 25/75 percentile marks	know how the cohort performed

* * *

tutor

monitor the attendance level of each student

allocate attendance marks accordingly

* * *

busy tutor

mark attendance using this app

forgo manually marking on a copy of the class list

* * *

tutor

monitor the assignment submissions of each student

keep track of who has submitted and who has not

* * *

concerned tutor

monitor the test scores of all my students taking the module

identify the weaker students who need more help

* * *

tutor

input student assignment scores

keep track of them

* * *

tutor

record participation marks of each student in tutorial

effectively keep track without tedious manual documentation

* *

tutor

review student’s feedback of me

improve my lessons

* *

tutor

quickly sort and identify which student needs help

customise my teaching to each student

*

tutor

view my students’ images

identify them during class

*

tutor

send automatic reminders to students who have not submitted their assignments

ensure they will not miss out on learning

*

tutor

calculate the average, median, and 25/75 percentile marks

know how the cohort performed

Appendix D: Use Cases

(For all use cases below, the System is EazyTutors and the Tutor is the user, unless specified otherwise)

Use case: Check Attendance

MSS

Precondition: Home page

Tutor chooses to check attendance
EazyTutors requests for details of which tutorial session
Tutor enters the requested details.
EazyTutors displays the list of students who attended the tutorial session

Use case ends.

Extensions

3a. EazyTutor detects error in the entered data.
- 3a1. EazyTutors requests for correct data.
- 3a2. User enters new data.
- 3a3. Goes to step 4 with new details.

Use case: Assignment Submission

MSS

Tutor chooses to check for Assignment Submission
EazyTutors requests for details of which assignment
Tutor enters the requested details.
EazyTutors displays the list of students who submitted assignment.

Use case ends.

Extensions

1a. No assignment has been registered in EazyTutors yet.
- 1a1. EazyTutors shows an error window informing user that there are no assignments to view.
  
  Use case ends.
3a. EazyTutors detects error in the entered data.
- 3a1. EazyTutors requests for correct data.
- 3a2. User enters new data.
- 3a3. Goes to step 4 with new details.

Use case: Assignment Grading

MSS

Precondition: Home page

Tutor navigates to student list
EazyTutors shows list of students
Tutor selects the student
EazyTutors shows assignments that the student has submitted
Tutor chooses assignment to grade
EazyTutors shows current assignment score if any
Tutor inputs student’s new/updated score
EazyTutors shows the updated score

Use case ends.

{More to be added}

Appendix E: Non Functional Requirements

Should work on any mainstream OS as long as it has Java 9 or higher installed.
Should be able to hold up to 1000 persons without a noticeable sluggishness in performance for typical usage.
A user with above average typing speed for regular English text (i.e. not code, not system admin commands) should be able to accomplish most of the tasks faster using commands than using the mouse, if they choose to use the Command Line Interface.
Users should be able to use basic functions of the application with the UI without referring to the user guide.

{More to be added}

Appendix F: Glossary

Mainstream OS: Windows, Linux, Unix, OS-X
EazyTutors: The name of our application
Tutorial: Small group lessons in which there is more interaction between tutors and students compared to in lectures
Participation: Marks that students get based on how much they participate during tutorials

Appendix G: Instructions for Manual Testing

Given below are instructions to test the app manually.

These instructions only provide a starting point for testers to work on; testers are expected to do more exploratory testing.

G.1. Launch and Shutdown

Initial launch
1. Download the jar file and copy into an empty folder
2. Double-click the jar file
  Expected: Shows the GUI with a set of sample contacts. The window size may not be optimum.
Saving window preferences
1. Resize the window to an optimum size. Move the window to a different location. Close the window.
2. Re-launch the app by double-clicking the jar file.
  Expected: The most recent window size and location is retained.

G.2. Deleting a person

Deleting a person while all persons are listed
1. Prerequisites: List all persons using the list command. Multiple persons in the list.
2. Test case: delete 1
  Expected: First contact is deleted from the list. Details of the deleted contact shown in the status message. Timestamp in the status bar is updated.
3. Test case: delete 0
  Expected: No person is deleted. Error details shown in the status message. Status bar remains the same.
4. Other incorrect delete commands to try: delete, delete x (where x is larger than the list size), delete -1 (where index should not be negative)
  Expected: Similar to previous.

G.3. Adding a person

Adding a person to the current list
1. Prerequisites: No student already exists in the student list with the same name. If there is an index specified, it must be a positive integer lesser than the current size of the student list + 1.
2. Test case: add n/John Doe p/67891234 e/johnd@gmail.com a/Parliament House t/friend s/2
  Expected: Student with name "John Doe" added to 2nd index of list. Details of the added student shown in the status message. Timestamp in the status bar is updated.
3. Test case: add n/John Doe
  Expected: Student with name "John Doe" added to bottom of list, all other details are empty. Details of the added student shown in the status message. Timestamp in the status bar is updated.
4. Test case: add n/John Doe s/1
  Expected: Similar to previous, except the student is now added to the top of the list.
5. Test case: add n/ p/98765432 e/test@example.com
  Expected: No person is added. Error details shown in the status message. Status bar remains the same.
6. Other incorrect add commands to try: add n/John Doe p/99, add n/John Doe t/good friend, `add n/John Doe e/test (commands where the parameters used are invalid)

G.4. Adding a note

Adding a note to a student
1. Prerequisites: There must be a student at the index specified. The index must be a positive integer.
2. Test case: note 1 test
  Expected: If the first student had no note, his note as displayed at the bottom right is now test., else, test. is added to back of his existing note, with the full-stop of existing note changed to a comma. Details of student to whom the note was added is shown in the status message. Timestamp in the status bar is updated.
3. Test case: note 2 great!
  Expected: Similar to previous, except the note ends with an exclamation mark instead.
4. Test case: note 1 test2
  Expected: No note is added. Error details shown in the status message. Status bar remains the same.
5. Other incorrect note commands to try: note 1test, note 1 test (where the format is incorrect) Expected: Similar to previous.

G.5. Deleting a note

Deleting a note of a student
1. Prerequisites: Student at specified index must have an existing note.
2. Test case: delnote 1
  Expected: Note of first student is deleted. Details of the student whose note was deleted shown in the status message. Timestamp in the status bar is updated.
3. Test case: delnote 0
  Expected: No note is deleted. Error details shown in the status message. Status bar remains the same.
4. Other incorrect delete commands to try: delnote, delnote x (where x is larger than the list size), delnote -1 (where index should not be negative)
  Expected: Similar to previous.

G.6. Editing a note

Editing a student’s note
1. Prerequisites: Student at specified index must have an existing note.
2. Test case: editnote 1 test?
  Expected: New note test? displayed on bottom right of window. Details of student whose note was edited shown in the status message. Timestamp in the status bar is updated.
3. Test case: editnote 2 might need more help on recursion.
  Expected: Similar to previous, except the note ends with a full-stop instead.
4. Test case: editnote 1 test2
  Expected: No change to the note. Error details shown in the status message. Status bar remains the same.
5. Other incorrect note commands to try: editnote 2inquisitive, note 1 consult at 2pm (where the format is incorrect)
  Expected: Similar to previous.

G.7. Testing Assignment Manipulation

Optional Prerequisite: There is at least 1 person recorded in the application to view assignments in the gui.

Adding an assignment to the application
1. Prerequisites: Application currently do not have an assignment with the same name.
2. Test case: addAssignment n/Assignment1 w/15 d/31/12/2019 m/100
  Expected: New assignment called "Assignment1" is added to the application, if you select a student, Assignment1 will appear on the MoreDetailsPanel on the right of student list.
3. Test case: addAssignment n/Assignment2 w/a d/31/12/2019 m/100
  Expected: Error message appear: weight must be a real number.
Deleting an assignment
1. Prerequisites: There is at least 1 assignment stored in the application.
2. Test case: deleteAssignment 1
  Expected: The first assignment on the assignment list will be deleted.
3. Test case: deleteAssignment asdf
  Expected: Invalid command format error.
Editing an assignment
1. Prerequisites: There is at least 1 assignment stored in the application. There is no assignment with the name "Assignment2"
2. Test case: editAssignment 1 n/Assignment2 w/30
  Expected: the first assignment’s name in the assignment list changed to "Assignment2" and its weight changed to 30.
Marking a person
1. Prerequisites: There is at least 2 person and 1 assignment stored.
2. Test case: markAssignment 2 id/1 m/30
  Expected: second person in the list have his/her mark stored for first assignment. He/She got 30 marks for it.
Sorting assignments
1. Prerequisites: There is at least 2 assignment and not ordered from oldest to latest by deadline.
2. Test case: sortAssignment
  Expected: the assignments are all sorted by deadline and if they have same deadline, then by name.

G.8. Testing Assignment Statistics

Statistics of assignment with no marks entered
1. Prerequisites: Students list not empty. Assignment list contains assignments with no marks entered for any student.
2. Test case: assignmentStats 1
  Expected: Statistics data is all 0.
Statistics of assignment after student with marks deleted
1. Prerequisites: Students list contains 1 student with marks for an assignment.
2. Test case: delete 1 assignmentStats 1
  Expected: Statistics data is all 0 because marks are deleted along with the student.
Statistics of deleted assignment
1. Prerequisites: Assignment list contains an assignment to be deleted.
2. Test case: deleteAssignment 1 assignmentStats 1
  Expected: Assignment is no longer accessible, invalid index or index refers to other assignment.
Statistics of assignment with marks entered
1. Prerequisites: Students list not empty. Assignment list contains an assignment with marks entered for any student.
2. Test case: assignmentStats 1
  Expected: Statistics data is accurate according to the marks.

G.9. Testing Class Statistics

Statistics of class with no students and no assignments
1. Prerequisites: Students list and assignment list is empty.
2. Test case: classStats
  Expected: Statistics data is all 0.
Statistics of class with students but no assignments
1. Prerequisites: Students list contains students but no assignments.
2. Test case: classStats
  Expected: Statistics shows the number of students, other data is all 0.
Statistics of class with students and assignments but no marks entered
1. Prerequisites: Students list not empty. Assignment list contains assignments with no marks entered for any student.
2. Test case: classStats
  Expected: Statistics shows the number of students and the maximum grade is the total weight of the assignments, other data is all 0.
Statistics of class with students and assignments with marks entered
1. Prerequisites: Students list not empty. Assignment list contains assignments with marks entered for students.
2. Test case: classStats
  Expected: Statistics data is accurate according to the total marks of the students.

{ more test cases … }

G.10. Add Profile Photo

Prerequisites: The Profile Photo should not exceed 5MB.
1. Advantage: Restricts user from uploading large image files as this may affect performance of the application.

EazyTutors - Developer Guide

Events-Driven nature of the design

Logic component

Model component

Ui component

Storage component

Use case: Check Attendance

Use case: Assignment Submission

Use case: Assignment Grading

`Logic` component

`Model` component

`Ui` component

`Storage` component