def test_cls_get_position(self):
v = Valve()
assert v.position == 0
def test_sys_flow_rate_str_press(self):
with pytest.raises(ValueError):
v = Valve(drop="a")
def test_sys_flow_rate_str_coeff(self):
with pytest.raises(ValueError):
v = Valve(flow_coeff="a")
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
def test_calc_coeff_expected(self):
v = Valve()
v.calc_coeff(2)
assert v.Cv == 60.0
def test_press_drop_neg(self):
v = Valve(flow_coeff=15.0, sys_flow_out=-100)
v.press_drop(v.flow_out)
assert v.deltaP == 44.44444444444445
def test_press_drop_str(self):
"""Checks for correct Exception thrown if non-number argument used"""
v = Valve(flow_coeff=15.0)
with pytest.raises(TypeError):
v.deltaP("a")
def test_calc_coeff_str(self):
"""Checks for correct Exception thrown if non-number argument used"""
v = Valve()
with pytest.raises(TypeError):
v.calc_coeff("a")
def test_press_drop_zero(self):
v = Valve(flow_coeff=15.0)
v.press_drop(0)
assert v.deltaP == 0
def test_calc_coeff_zero(self):
v = Valve()
v.calc_coeff(0)
assert v.Cv == 0.0
def test_close(self):
v = Valve(position=100)
v.close()
assert v.position == 0
def test_calc_coeff_neg(self):
v = Valve()
v.calc_coeff(-2)
assert v.Cv == 60.0
def test_open(self):
v = Valve()
v.open()
assert v.position == 100
def test_cls_change_position(self):
v = Valve()
v.position = 100
assert v.position == 100
