FileConventions.Tests: add failing test

Add failing test for WrapText function based on [1].

[1] nblockchain#117

src/FileConventions.Test/WrapTextTests.fs

@@ -107,3 +107,19 @@ let WrapTextTest5() =
     let expectedResult = text
 
     Assert.That(WrapText text characterCount, Is.EqualTo expectedResult)
+
+[<Test>]
+let WrapTextTest6() =
+    let characterCount = 64
+    let commitMsg =
+        """foo: this is a header
+
+this is a body:
+
+```
+A code block that has two conditions, it has a very long line that exceeds the limit.
+
+It also has multiple paragraphs.
+```"""
+
+    Assert.That(WrapText commitMsg characterCount, Is.EqualTo commitMsg)