Moved the chats of the BeyondFacts Lab to the embedded chat of assistants (#1203)

app/Tests/Chat/Embedded/EmbeddedChatOpeningTests.cs

@@ -4,13 +4,15 @@ using AIStudio.Chat.Embedded;
 namespace AIStudio.Tests.Chat.Embedded;
 
 /// <summary>
-/// Checks when an embedded chat sends the message it opens with.
+/// Checks when an embedded chat sends the message it opens with, and when it offers to let the model begin.
 /// </summary>
 [TestFixture]
 public sealed class EmbeddedChatOpeningTests
 {
     private static readonly ContentText OPENING_MESSAGE = new() { Text = "What is new today?" };
 
+    private const string START_REQUEST = "Open the conversation with your first message.";
+
     [Test]
     public void AnEmptyChatSendsItsOpeningMessage()
     {
@@ -61,6 +63,57 @@ public sealed class EmbeddedChatOpeningTests
         Assert.That(EmbeddedChatOpening.SendsNow(OPENING_MESSAGE, conversation, wasSent: false), Is.False);
     }
 
+    [Test]
+    public void AnEmptyChatOffersToBegin()
+    {
+        Assert.That(EmbeddedChatOpening.OffersStart(START_REQUEST, Conversation()), Is.True);
+    }
+
+    [Test]
+    public void AChatWithoutStartRequestOffersNothing()
+    {
+        using (Assert.EnterMultipleScope())
+        {
+            Assert.That(EmbeddedChatOpening.OffersStart(null, Conversation()), Is.False);
+            Assert.That(EmbeddedChatOpening.OffersStart(" ", Conversation()), Is.False);
+        }
+    }
+
+    [Test]
+    public void AChatWhoseConversationBeganOffersNothing()
+    {
+        var conversation = Conversation();
+        conversation.Thread!.Blocks.Add(new ContentBlock { Role = ChatRole.AI, ContentType = ContentType.TEXT, Content = new ContentText { Text = "Hello, what do you prepare?" } });
+
+        Assert.That(EmbeddedChatOpening.OffersStart(START_REQUEST, conversation), Is.False);
+    }
+
+    [Test]
+    public void AChatWithOnlyAHiddenRequestStillOffersToBegin()
+    {
+        // E.g., the model failed to answer the request which lets it begin:
+        var conversation = Conversation();
+        conversation.Thread!.Blocks.Add(new ContentBlock { Role = ChatRole.USER, ContentType = ContentType.TEXT, Content = new ContentText { Text = START_REQUEST }, HideFromUser = true });
+
+        Assert.That(EmbeddedChatOpening.OffersStart(START_REQUEST, conversation), Is.True);
+    }
+
+    [Test]
+    public void AChatWhichLoadsRunsOrCannotBeOpenedOffersNothing()
+    {
+        var running = Conversation();
+        running.IsRunning = true;
+        var unavailable = Conversation();
+        unavailable.Thread = null;
+
+        using (Assert.EnterMultipleScope())
+        {
+            Assert.That(EmbeddedChatOpening.OffersStart(START_REQUEST, null), Is.False);
+            Assert.That(EmbeddedChatOpening.OffersStart(START_REQUEST, running), Is.False);
+            Assert.That(EmbeddedChatOpening.OffersStart(START_REQUEST, unavailable), Is.False);
+        }
+    }
+
     private static EmbeddedConversation Conversation() => new()
     {
         ChatId = Guid.NewGuid(),