def test_sand_rate_None_input():
raw = 5000
zero = 3000
step = 500
exp = 1
kwargs = {'raw': raw, 'zero': zero, 'step': step, 'exp': exp}
for inp in ['raw', 'zero', 'step', 'exp']:
kwargs[inp] = None
with pytest.raises(exc.FunctionInputFail) as excinfo:
sand_rate(**kwargs)
kwargs['raw'] = raw
kwargs['zero'] = zero
kwargs['step'] = step
kwargs['exp'] = exp
def test_sand_rate(raw, zero, step, exp, E):
np.testing.assert_equal(sand_rate(raw, zero, step, exp=exp), E)
def test_sand_rate(raw, zero, step, E):
assert sand_rate(raw, zero, step) == E