Added the BeyondFacts Lab as a prototype (#1175)

app/Tests/BeyondFactsLab/BflProjectSelectionTests.cs

@@ -0,0 +1,78 @@
+using AIStudio.Assistants.BeyondFactsLab;
+
+namespace AIStudio.Tests.BeyondFactsLab;
+
+/// <summary>
+/// Checks which preparation the BeyondFacts Lab shows after its list changed.
+/// </summary>
+[TestFixture]
+public sealed class BflProjectSelectionTests
+{
+    private static readonly BflProjectEntry CHANGED_LAST = Entry("Changed last");
+    private static readonly BflProjectEntry SELECTED_LAST = Entry("Selected last");
+    private static readonly BflProjectEntry JUST_CREATED = Entry("Just created");
+    private static readonly IReadOnlyList<BflProjectEntry> PROJECTS = [CHANGED_LAST, SELECTED_LAST, JUST_CREATED];
+
+    [Test]
+    public void ThePreparationAskedForComesFirst()
+    {
+        var chosen = BflProjectSelection.Choose(PROJECTS, JUST_CREATED.ProjectId, SELECTED_LAST.ProjectId);
+
+        Assert.That(chosen, Is.SameAs(JUST_CREATED));
+    }
+
+    [Test]
+    public void WithoutAWishThePreparationSelectedLastIsShown()
+    {
+        var chosen = BflProjectSelection.Choose(PROJECTS, null, SELECTED_LAST.ProjectId);
+
+        Assert.That(chosen, Is.SameAs(SELECTED_LAST));
+    }
+
+    [Test]
+    public void APreparationWhichIsGoneFallsBackToTheOneSelectedLast()
+    {
+        var chosen = BflProjectSelection.Choose(PROJECTS, Guid.NewGuid(), SELECTED_LAST.ProjectId);
+
+        Assert.That(chosen, Is.SameAs(SELECTED_LAST));
+    }
+
+    [Test]
+    public void WithoutAnyKnownSelectionThePreparationChangedLastIsShown()
+    {
+        var chosen = BflProjectSelection.Choose(PROJECTS, Guid.NewGuid(), Guid.NewGuid());
+
+        Assert.That(chosen, Is.SameAs(CHANGED_LAST));
+    }
+
+    [Test]
+    public void WithoutPreparationsNothingIsShown()
+    {
+        var chosen = BflProjectSelection.Choose([], Guid.NewGuid(), null);
+
+        Assert.That(chosen, Is.Null);
+    }
+
+    [Test]
+    public void APreparationWhichCannotBeOpenedCanStillBeShown()
+    {
+        var unavailable = new BflProjectEntry(Guid.NewGuid(), string.Empty, DateTimeOffset.UtcNow, BflProjectLoadStatus.UNAVAILABLE, null);
+
+        var chosen = BflProjectSelection.Choose([CHANGED_LAST, unavailable], unavailable.ProjectId, null);
+
+        Assert.That(chosen, Is.SameAs(unavailable));
+    }
+
+    private static BflProjectEntry Entry(string name)
+    {
+        var project = new BflProject
+        {
+            ProjectId = Guid.NewGuid(),
+            Name = name,
+            CreatedAtUtc = DateTimeOffset.UtcNow,
+            ModifiedAtUtc = DateTimeOffset.UtcNow,
+        };
+
+        return BflProjectEntry.FromProject(project);
+    }
+}