def test_post_get_exc(): pool = DAGPool() bogua = BogusError("bogua") pool.post("a", bogua) assert isinstance(pool.get("a"), BogusError), \ "should have delivered BogusError instead of raising" bogub = PropagateError("b", BogusError("bogub")) pool.post("b", bogub) with assert_raises(PropagateError): pool.get("b") # Notice that although we have both "a" and "b" keys, items() is # guaranteed to raise PropagateError because one of them is # PropagateError. Other values don't matter. with assert_raises(PropagateError): pool.items() # Similar remarks about waitall() and wait(). with assert_raises(PropagateError): pool.waitall() with assert_raises(PropagateError): pool.wait() with assert_raises(PropagateError): pool.wait("b") with assert_raises(PropagateError): pool.wait("ab") # but if we're only wait()ing for success results, no exception assert isinstance(pool.wait("a")["a"], BogusError), \ "should have delivered BogusError instead of raising" # wait_each() is guaranteed to eventually raise PropagateError, though you # may obtain valid values before you hit it. with assert_raises(PropagateError): for k, v in pool.wait_each(): pass # wait_each_success() filters assert_equals(dict(pool.wait_each_success()), dict(a=bogua)) assert_equals(dict(pool.wait_each_success("ab")), dict(a=bogua)) assert_equals(dict(pool.wait_each_success("a")), dict(a=bogua)) assert_equals(dict(pool.wait_each_success("b")), {}) # wait_each_exception() filters the other way assert_equals(dict(pool.wait_each_exception()), dict(b=bogub)) assert_equals(dict(pool.wait_each_exception("ab")), dict(b=bogub)) assert_equals(dict(pool.wait_each_exception("a")), {}) assert_equals(dict(pool.wait_each_exception("b")), dict(b=bogub))