public void CheckSize_file_no_big_max_size_true_returned() { //Arrange FileChecker fileChecker = new FileChecker(); string accept = Directory.GetCurrentDirectory() + "file-test-no-max-size"; using (FileStream fstream = new FileStream(accept, FileMode.Create)) { byte[] array = new byte[2097152]; for (int i = 0; i < 2097152; i++) { array[i] = 0; } fstream.Write(array, 0, array.Length); } bool expected = true; //Act bool actual = fileChecker.CheckSize(accept); //Result Assert.AreEqual(expected, actual); }