fix: more flaky testing

[thomasrockhu-codecov]

No description provided.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
4	1	3	0

View the top 1 failed test(s) by shortest run time

app/test_calculator.py::test_divide

Stack Traces | 0.001s run time

def test_divide():
        if random.random() < 0.2:
>           assert True == False
E           assert True == False

app/test_calculator.py:30: AssertionError

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