Connect graphical CCS interviews to cases

api/QuestionsApi.Tests/CcsCaseTests.cs

@@ -135,6 +135,48 @@ public sealed class CcsCaseTests
         Assert.Empty(CcsCaseValidator.ValidateImport(ValidImport(), new HashSet<string>()));
     }
 
+    [Fact]
+    public void InteractiveInterviewRequiresAReachableAcyclicGraph()
+    {
+        var request = ValidImport();
+        request.Cases[0].InitialInterview = ValidInterview();
+        Assert.Empty(CcsCaseValidator.ValidateImport(request, new HashSet<string>()));
+
+        request.Cases[0].InitialInterview.Nodes[0].Choices[0].NextNodeId = "missing";
+        var errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
+        Assert.Contains(errors, value => value.Contains("unknown next node", StringComparison.OrdinalIgnoreCase));
+
+        request = ValidImport();
+        request.Cases[0].InitialInterview = ValidInterview();
+        request.Cases[0].InitialInterview.Nodes[1].IsTerminal = false;
+        request.Cases[0].InitialInterview.Nodes[1].Choices = [new() { Id = "loop", Text = "Start over", NextNodeId = "greeting" }];
+        errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
+        Assert.Contains(errors, value => value.Contains("cycles", StringComparison.OrdinalIgnoreCase));
+
+        request = ValidImport();
+        request.Cases[0].InitialInterview = ValidInterview();
+        request.Cases[0].InitialInterview.Nodes.Add(new() { Id = "orphan", PatientText = "Unreachable", IsTerminal = true });
+        errors = CcsCaseValidator.ValidateImport(request, new HashSet<string>());
+        Assert.Contains(errors, value => value.Contains("reachable", StringComparison.OrdinalIgnoreCase));
+    }
+
+    [Fact]
+    public void DialogueChoicesPersistAndCompleteWithoutAdvancingSimulatedTime()
+    {
+        var definition = ValidImport().Cases[0];
+        definition.InitialInterview = ValidInterview();
+        var attempt = new CcsAttempt { InterviewNodeId = "greeting", SimulatedMinute = 7, OpeningCompleted = false };
+
+        CcsStore.ApplyDialogueChoice(attempt, definition, "ask_reason", DateTime.UtcNow);
+
+        Assert.Equal("done", attempt.InterviewNodeId);
+        Assert.Equal(["ask_reason"], attempt.InterviewChoiceIds);
+        Assert.Equal(7, attempt.SimulatedMinute);
+        Assert.True(attempt.OpeningCompleted);
+        Assert.Contains(attempt.Actions, value => value.Type == "dialogue_choice" && value.Code == "ask_reason");
+        Assert.Throws<InvalidOperationException>(() => CcsStore.ApplyDialogueChoice(attempt, definition, "ask_reason", DateTime.UtcNow));
+    }
+
     [Fact]
     public void CcsExpectedScoreUsesSeparateUserAndCaseElo()
     {
@@ -201,4 +243,14 @@ public sealed class CcsCaseTests
             }
         ]
     };
+
+    private static CcsInitialInterview ValidInterview() => new()
+    {
+        StartNodeId = "greeting",
+        Nodes =
+        [
+            new() { Id = "greeting", PatientText = "Hello, doctor.", Choices = [new() { Id = "ask_reason", Text = "What brings you in?", NextNodeId = "done" }] },
+            new() { Id = "done", PatientText = "Thank you.", IsTerminal = true }
+        ]
+    };
 }