diff --git a/src/Test/Utilities/Portable/FX/CappedStringWriter.cs b/src/Test/Utilities/Portable/FX/CappedStringWriter.cs
index 66fdb0498c42aca67183b5ea0789342356fbcccf..b60f9d1e4ba0096affab3b3a067718dfff7d0d52 100644
--- a/src/Test/Utilities/Portable/FX/CappedStringWriter.cs
+++ b/src/Test/Utilities/Portable/FX/CappedStringWriter.cs
@@ -33,7 +33,7 @@ public CappedStringWriter(int expectedLength)
 
         private void CapReached()
         {
-            Assert.True(false, "Test produced more output than expected (" + _expectedLength + " characters). Is it in an infinite loop? Output so far:\r\n" + GetStringBuilder());
+            throw new Exception($"Test produced more output than expected ({_expectedLength} characters). Is it in an infinite loop? Output so far:\r\n{GetStringBuilder()}");
         }
 
         public override void Write(char value)