Geek asks and answers

How to check the correctness of functions that are used randomly?

There are some areas of applications (for example, GameDev) in which many functions must be created using random values ​​to output their results. One example is given below:

def generate_key(monster_key_drop_coef):
    key_letters = string.ascii_uppercase
    rand = random.random()
    if monster_key_drop_coef < rand:
        return None

    button = {}
    button["type"] = random.choice([1,2,3])
    button["letter"] = random.choice(key_letters)
    return button

This function generates an element drop based on several random operations. The problem arises if you want to automatically check the correctness of this function. The generated values ​​are not deterministic, and recording regression tests seems impossible.

My questions:

  • Is it possible to write useful regression tests for this type of function?
  • Is there a general approach for creating some other types of tests in this case?
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source
2

:

def test_generate_key():
    button_list = []
    for _ in range(1, 1000):
        button_list.append(generate_key(0.2))

    is_all_none = True
    is_not_none = False
    for key in button_list:
        is_all_none &= (key is None)
        is_not_none |= (key is not None)

    assert is_all_none == False
    assert is_not_none == True

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