How to use the check50.File function in check50

def test0(self):
        """handles a height of 0 correctly"""
        self.spawn("./mario").stdin("0").stdout(File("0.txt")).exit(0)

def test24(self):
        """rejects a height of 24, and then accepts a height of 2"""
        self.spawn("./mario").stdin("24").reject()\
            .stdin("2").stdout(File("2.txt")).exit(0)

def append_code(self, original, codefile):
        if isinstance(original, File):
            original = original.filename

        if isinstance(codefile, File):
            codefile = codefile.filename

        with open(codefile) as code, open(original, "a") as o:
            o.write("\n")
            o.write(code.read())

def test2(self):
        """handles a height of 2 correctly"""
        out = self.spawn("./mario").stdin("2").stdout()
        correct = File("2.txt").read()
        check_pyramid(out, correct)

def read(self):
        with File._open(self.filename) as f:
            return f.read()

def test23(self):
        """handles a height of 23 correctly"""
        out = self.spawn("./mario").stdin("23").stdout()
        correct = File("23.txt").read()
        check_pyramid(out, correct)

def test1(self):
        """handles a height of 1 correctly"""
        out = self.spawn("./mario").stdin("1").stdout()
        correct = File("1.txt").read()
        check_pyramid(out, correct)