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0 votes
I have a class with the same method:
class MyClass
        private static MyClass MeMethod(string myparam)
            MyClass result = null;
            string[] dir = Directory.GetFiles(myparam);
            return result;

And I need to test it with isolating Directory.GetFiles call. I've tried something like this:
var myClassFake = Isolate.Fake.Instance<MyClass>(Members.CallOriginal);

var str1 = "some path";
var str2 = "some pattern";
Isolate.WhenCalled(() => Directory.GetFiles(str1, str2)).WillReturn(null);
Utilities.Throws<DirectoryNotFoundException>(() =>
                    Isolate.Invoke.Method(typeof(MyClass), "MyMethod", myparam),
                    "", "Invalid msg on validation error");

but it wants work. It throws a DirectoryNotFoundException in line
Isolate.WhenCalled(() => Directory.GetFiles(str1, str2)).WillReturn(null);

You solutions can be?
asked by atikhomirov (1.6k points)

1 Answer

0 votes

Directory.GetFiles() is in mscorlib.dll, which currently cannot be faked with Isolator (except for specific APIs that are enabled, like DateTime.Now). This means that the WhenCalled() statement does not record the call, and the framework actually tries to run GetFiles(), which causes the exception you got.

As a workaround until we provide a complete mscorlib support you can wrap your IO logic in a method and fake that method.

Typemock Support
answered by doron (17.2k points)