Some of my tests fail to respond when I change assertions (e.g. Assert.IsTrue(false))

Looking at the processing Queue shows this on the "Run Tests" line.

[14:16:29.4537-TestExecutionTask-33] ERROR (Internal): System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
at nCrunch.TestExecution.Frameworks.NUnit.NUnitTestRepository.#=qCUzbojIP475Ta93D1jObRJrJLWxH3_LYX1$zz1DSJ56iuN3BUgQtQAQ_7eYuClZY(IEnumerable`1 #=q1g7FSt7hXXax0vb_pS5H1Q==, IDictionary`2 #=qEvy89agmB2e_gRvNaIItiw==)
at nCrunch.TestExecution.Frameworks.NUnit.NUnitTestRepository..ctor(IEnumerable`1 testsToRun)
at nCrunch.TestExecution.Frameworks.NUnit.NUnitTestFramework.#=qGrRJ7gTK5_ax8EwKB8rrb4c2ZNSP_xrxnUqyktcDuPE=.#=q5PQXtKN44L40gg$2_ug00w==()
at #=qmdEAMK_c0wUkjl8QiR_0B$SqavkVGH8_WBLRdXnGACXX4ij_QGiQi6Yyi3LkqyId.#=qM5vw4cReHtB0oIZAADXisWrKqcIWrMteVT2lL5CSY$Y=(Action #=qQG$$IEqJNd7U57rti2oO0eMOr5L73KqDbcsBxL9FrLo=)
at nCrunch.TestExecution.Frameworks.NUnit.NUnitTestFramework.RunTests(TestOutput output, IList`1 testsToRun, MasterExecutionMapSet masterMapSet)
at nCrunch.TestExecution.TestRunnerThread.#=qh9mHFD74qNv_qxnwJeExOA==(IMasterExecutionMap[] #=qk1TQlxFS2PvZulTUk4olrnb6ZWeHHkBAUGvy2pOCQ04=, IList`1 #=q_93JaZI9Uj9vyZ1g2aaI8Q==)

These seem to be two unrelated issues.

The exception does happen. All my tests and assemblies are unique...though after restarting a couple of times it no longer happens...

The other issue was some mishap/misunderstanding of what happens with catching exceptions in unit tests. For example, the following NUnit test written in f#:


[<Test>]
member this.``fails if name cannot be parsed``() =
try
let ne = make_NamedElement "very_badly_named_string"
Assert.IsTrue(false)
with
| e -> Assert.AreEqual(e.Message, "Bad name...")

This actually works now. But I got into a situation where the circle indicators were not correct.