CODEWITHSUNDEEP
c#unit-testingtypemock
Ilya Suzdalnitski
Ilya Suzdalnitski

Reputation: 53560

TypeMock - faking Console.Error.WriteLine()

I'm trying to fake console output logging with TypeMock:

[Test]
public void Log_Error_LogsToStdErr()
{
    var logger = SetupFakeLogger();

    logger.Log( "text to log", true );

    Isolate.Verify.WasCalledWithAnyArguments( () => logger.LogToFile( "" ) );
    Isolate.Verify.WasCalledWithAnyArguments( () => Console.Error.WriteLine( "" ) );
}

private static WrapperLogger SetupFakeLogger()
{
    Isolate.Fake.StaticMethods( typeof(Console), Members.ReturnRecursiveFakes );

    Isolate.WhenCalled( () => Console.Error.WriteLine( "" ) ).IgnoreCall();    

    return Isolate.Fake.Instance<WrapperLogger>( Members.CallOriginal, ConstructorWillBe.Called, "dir", "file.log" );
}

However I'm getting the following exception on my second assert (call to Isolate.Verify for Console.Error.WriteLine):

TypeMock Verification: Method System.Environment.NewLine was expected but was not called

Is this some sort of a bug, or am I doing it incorrectly?

Upvotes: 0

Views: 182

Answers (1)

BarD
BarD

Reputation: 163

disclaimer i work at Typemock.

We don't support faking Console, please see our supported fakeable mscorlib types.

You can use TextWriter instead of Console and it will work.

See example:

 [TestMethod]
        public void Log_Error_LogsToStdErr()
        {
            var logger = SetupFakeLogger_Works();

            logger.Log("text to log", true);

            Isolate.Verify.WasCalledWithAnyArguments(() => logger.LogToFile(""));
            //Isolate.Verify.WasCalledWithAnyArguments(() => Console.Error.WriteLine(""));
        }

        private static WrapperLogger SetupFakeLogger_Works()
        {
            var textWriter = Isolate.Fake.Instance<TextWriter>();
            Console.SetOut(textWriter);

            return Isolate.Fake.Instance<WrapperLogger>(Members.CallOriginal, ConstructorWillBe.Called, "dir", "file.log");
        }

Upvotes: 2

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