def test_class_buoyancy_should_report_correct_buoyancy():
b = Buoyancy()
expected_buoyancy = 10052
buoyancy = b.calculate_buoyancy(1.0, 1025)
assert np.isclose(expected_buoyancy,
buoyancy,
rtol=1e-1,
atol=1e-2,
equal_nan=False)
def test_calculate_buoyancy_should_fail_for_invalid_density():
b = Buoyancy()
with pytest.raises(ValueError):
b.calculate_buoyancy(100, 'b')
def test_calculate_buoyancy_should_fail_for_invalid_volume():
b = Buoyancy()
with pytest.raises(ValueError):
b.calculate_buoyancy('a', 10)