public void GetFiles_DirectoryGetFiles_called()
{
var testObject = new FileSystem();
var someRandomPath = @"d:\temp\test";
var someRandomPattern = "*.txt";
var isMethodCalled = false;
using(ShimsContext.Create())
{
System.IO.Fakes.ShimDirectory.GetFilesStringString =
(path, pattern) => { isMethodCalled = true; return null; };
testObject.GetFiles(someRandomPath, someRandomPattern);
}
Assert.IsTrue(isMethodCalled);
}