def test_get(self):
image_counter = ImageCounter()
image_counter.add(1)
assert image_counter.get(1) == 0
image_counter.next(1)
assert image_counter.get(1) == 1
def test_add(self):
image_counter = ImageCounter()
image_counter.add(1)
assert image_counter.get(1) == 0
image_counter.add(1, 5)
assert image_counter.get(1) == 5
def test_add_negative(self):
with pytest.raises(ValueError):
image_counter = ImageCounter()
image_counter.add(1, -1)
def test_exists(self):
image_counter = ImageCounter()
image_counter.add(1)
assert image_counter.exists(1)