public void WhenFileHasNotBeenModifiedSince_ThenAssertFalse()
            {
                var file = BaseDir.CreateFile("ModifiedSince-Test1.txt");

                var since = DateTime.Now;

                Assert.Throws <AssertionException>(() => AssertFile.ModifiedSince(file, since));
            }
            public void WhenFileHasBeenModifiedSince_ThenAssertTrue()
            {
                var since = DateTime.Now.AddSeconds(-1);

                var file = BaseDir.CreateFile("ModifiedSince-Test1.txt");

                Assert.DoesNotThrow(() => AssertFile.ModifiedSince(file, since));
            }