Added the BeyondFacts Lab as a prototype (#1175)

app/Tests/Tools/AppResourcesTests.cs

@@ -0,0 +1,47 @@
+using AIStudio.Tools;
+
+namespace AIStudio.Tests.Tools;
+
+/// <summary>
+/// Checks how AI Studio reads the files which come with it.
+/// </summary>
+/// <remarks>
+/// The tests run a development build, which reads the files from its output folder: the project file copies every
+/// embedded file there as well.
+/// </remarks>
+[TestFixture]
+public sealed class AppResourcesTests
+{
+    [Test]
+    public async Task AFileOfTheAppIsRead()
+    {
+        var text = await AppResources.ReadTextAsync("Assistants/PromptOptimizer/prompting_guideline.md");
+
+        Assert.That(text, Is.Not.Empty);
+    }
+
+    [Test]
+    public async Task BackslashesAndOuterSlashesAreAccepted()
+    {
+        var withSlashes = await AppResources.ReadTextAsync("Assistants/PromptOptimizer/prompting_guideline.md");
+        var withBackslashes = await AppResources.ReadTextAsync("/Assistants\\PromptOptimizer\\prompting_guideline.md");
+
+        Assert.That(withBackslashes, Is.EqualTo(withSlashes));
+    }
+
+    [Test]
+    public async Task AMissingFileGivesAnEmptyText()
+    {
+        var text = await AppResources.ReadTextAsync("Assistants/PromptOptimizer/does-not-exist.md");
+
+        Assert.That(text, Is.Empty);
+    }
+
+    [Test]
+    public void AFolderOfTheAppListsItsFiles()
+    {
+        var provider = AppResources.FolderProvider("Assistants/PromptOptimizer");
+
+        Assert.That(provider.GetDirectoryContents(string.Empty).Select(file => file.Name), Does.Contain("prompting_guideline.md"));
+    }
+}