Backend: FakeCanvasIntegration needs to provide a starter TestStudent

[frozenfrank]

Overview

Running the autograder with --use-canvas false leads to a null TestStudent which breaks the AutoGrader. The FakeCanvasIntegration should be able to provide a starter value that does some good.

Root Issues in Source Code

/// src/main/java/edu/byu/cs/service/AdminService.java
    public static User updateTestStudent() throws CanvasException, DataAccessException {
        User latestTestStudent = CanvasService.getCanvasIntegration().getTestStudent(); // This returns `null`

        // ...

            if (user == null) {
                user = latestTestStudent;
                userDao.insertUser(latestTestStudent); // Error is thrown here
            } else {
                userDao.setRepoUrl(user.netId(), latestTestStudent.repoUrl());
                userDao.setCanvasUserId(user.netId(), latestTestStudent.canvasUserId());
            }
    }

/// src/main/java/edu/byu/cs/canvas/FakeCanvasIntegration.java
    @Override
    public User getTestStudent() {
        return null; // ISSUE! Prevents the project from doing anything meaningful
    }

Symptomatic Error

10:53:12.008 ERROR edu.byu.cs.service.AdminService -- Error updating user
edu.byu.cs.dataAccess.DataAccessException: Error inserting item into table user
	at edu.byu.cs.dataAccess.sql.helpers.SqlReader.insertItem(SqlReader.java:120)
	at edu.byu.cs.dataAccess.sql.UserSqlDao.insertUser(UserSqlDao.java:40)
	at edu.byu.cs.service.AdminService.updateTestStudent(AdminService.java:101)
	at edu.byu.cs.controller.AdminController.lambda$static$1(AdminController.java:43)
	at spark.RouteImpl$1.handle(RouteImpl.java:72)
	at spark.http.matching.Routes.execute(Routes.java:61)
	at spark.http.matching.MatcherFilter.doFilter(MatcherFilter.java:134)
	at spark.embeddedserver.jetty.JettyHandler.doHandle(JettyHandler.java:50)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1598)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:59)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.Server.handle(Server.java:516)
	at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487)
	at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
	at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
	at java.base/java.lang.Thread.run(Thread.java:1570)
Caused by: java.lang.NullPointerException: null
	at edu.byu.cs.dataAccess.sql.helpers.SqlReader.setValue(SqlReader.java:125)
	at edu.byu.cs.dataAccess.sql.helpers.SqlReader.insertItem(SqlReader.java:115)
	... 27 common frames omitted