[Test] public void create_File()
        {
            var fileName = "test.txt".insert_5_RandomLetters();
            var contents = "some contents".add_5_RandomLetters();
            var filePath = apiCassini.create_File(fileName, contents);

            filePath.assert_File_Exists()
            .assert_Are_Equal(file => file.contents(), contents)
            .assert_File_Deleted();


            //check nulls and empty
            apiCassini.create_File(fileName, "").assert_Null();
            apiCassini.create_File(fileName, null).assert_Null();
        }