Add a test for SA0002 when deserialization throws JsonParseException

Previously we were testing for cases where InvalidSettingsException was thrown,
but not for the case where the JSON syntax was invalid. This commit adds a test
covering the additional case.

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test/SpecialRules/SA0002UnitTests.cs

@@ -78,6 +78,26 @@ public async Task TestInvalidSettingValueAsync()
             await this.VerifyCSharpDiagnosticAsync(TestCode, expected, CancellationToken.None).ConfigureAwait(false);
         }
 
+        [Fact]
+        public async Task TestInvalidSettingSyntaxAsync()
+        {
+            // Missing the ':' between "companyName" and "name"
+            this.settings = @"
+{
+  ""settings"": {
+    ""documentationRules"": {
+      ""companyName"" ""name""
+    }
+  }
+}
+";
+
+            // This diagnostic is reported without a location
+            DiagnosticResult expected = this.CSharpDiagnostic();
+
+            await this.VerifyCSharpDiagnosticAsync(TestCode, expected, CancellationToken.None).ConfigureAwait(false);
+        }
+
         [Fact]
         public async Task TestEmptySettingsAsync()
         {