-
pytest.raises
-
Assert that a code block/function call raises an exception type, or one of its subclasses.
Use
pytest.raises as a context manager, which will capture the exception of the given type, or any of its subclasses.
-
The context manager produces an
ExceptionInfo object which can be used to inspect the details of the captured exception
def continuous(start: float, end: float, count: int) -> List[float]:
if start > end:
raise ValueError("Start must be <= end.")
if count < 0:
raise ValueError("Count must be non-negative.")
return [random.uniform(start, end) for _ in range(count)]
def test_continuous():
assert len(continuous(start=0, end=1, count=5)) == 5
assert len(continuous(start=0, end=1, count=0)) == 0
assert all(0 <= x <= 10 for x in continuous(start=0, end=10, count=100))
with pytest.raises(ValueError) as exc_info:
continuous(start=10, end=0, count=5)
assert exc_info.type is ValueError
with pytest.raises(ValueError) as exc_info:
continuous(start=0, end=10, count=-1)
assert exc_info.type is ValueError