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

            using (var testState = new TestState())
            {
                var approvedNamespaceFiles = testState.GetApprovedNamespaces();
                var test         = new AutoTestFile(sampleCode, new Rule(ApprovedNamespaceAnalyzer.ProductionRule, "NationalInstruments.Design.Toolbar", testState.ApprovedNamespacesFilePath));
                var testAfterFix = new AutoTestFile(sampleCode.Replace("<?>", string.Empty));

                VerifyDiagnostics(test, approvedNamespaceFiles);
                testState.AppendToApprovedNamespacesFile("\r\nNationalInstruments.Design.Toolbar");
                VerifyDiagnostics(testAfterFix, approvedNamespaceFiles);
            }
        }