Help in PSET-5

I am doing the bank test problem and my code is passing all the tests both manually and through pytest, but when i do check50 everything is issues except the first one which is if the file exists. This is my code

>!


from bank import value


def test_hello():
    assert value("Hello") == "$0"
    assert value("Hello, Amrit") == "$0"
    assert value("hello") == "$0"
    assert value("HELLO") == "$0"


def test_h():
    assert value("Hi") == "$20"
    assert value("Hohohoho, whats up") == "$20"
    assert value("hi") == "$20"
    assert value("HI") == "$20"


def test_nothing():
    assert value("Yo") == "$100"
    assert value("What's up") == "$100"


def test_punctuation():
    assert value(",") == "$100"
    assert value(".") == "$100"


if __name__ == "__main__":
    test_hello()
    test_h()
    test_nothing()
    test_punctuation()   

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