def test_sys_flow_rate_zero_coeff(self):
v = Valve(flow_coeff=0.0, drop=7.5)
with pytest.raises(ValueError) as excinfo:
v.valve_flow_out(v.Cv, v.deltaP)
exception_msg = excinfo.value.args[0]
assert exception_msg == "Input values must be > 0."
def test_sys_flow_rate_neg_press(self):
v = Valve(drop=-30.0)
with pytest.raises(ValueError) as excinfo:
v.valve_flow_out(v.Cv, v.deltaP)
exception_msg = excinfo.value.args[0]
assert exception_msg == "Input values must be > 0."
def test_sys_flow_rate_expected(self):
v = Valve(flow_coeff=15.0, drop=7.5)
v.valve_flow_out(v.Cv, v.deltaP)
assert v.flow_out == 41.07919181288746