public void UnapprovedTestUtilitiesNamespace_ApproveNamespaceExternally_NoDiagnostic()
        {
            var sampleCode = @"
namespace <?>NationalInstruments.TestUtilities.SourceModel
{
    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}";

            using (var testState = new TestState())
            {
                var approvedNamespaceFiles = testState.GetApprovedNamespaces();
                var test         = new AutoTestFile(sampleCode, new Rule(ApprovedNamespaceAnalyzer.TestRule, "NationalInstruments.TestUtilities.SourceModel", testState.ApprovedTestNamespacesFilePath));
                var testAfterFix = new AutoTestFile(sampleCode.Replace("<?>", string.Empty));

                VerifyDiagnostics(test, approvedNamespaceFiles);
                testState.AppendToApprovedTestNamespacesFile("\r\nNationalInstruments.TestUtilities.SourceModel");
                VerifyDiagnostics(testAfterFix, approvedNamespaceFiles);
            }
        }