Update test_cdc.py

Updating test_cdc.py: 
- deleted test cases involving deprecated methods(_alum_nu, _pacl_nu, _coag_nu, coag_q_max_est)

tests/design/test_cdc.py

@@ -16,6 +16,7 @@
 	(cdc_20.coag_nu(2 * u.g / u.L, "alum"), 1.00357603e-06 * u.m**2 / u.s),
 	(cdc_20.coag_nu(2 * u.g / u.L, "PACl"), 1.00364398e-06 * u.m**2 / u.s),
 
+
 	(cdc_20.coag_q_max, 0.01333333 * u.L / u.s),
 	(cdc_60.coag_q_max, 0.012 * u.L / u.s),
 
@@ -59,13 +60,3 @@ def test_cdc(actual, expected):
 		assert actual.magnitude == pytest.approx(expected.magnitude)
 	else:
 		assert actual == pytest.approx(expected)
-
-@pytest.mark.parametrize('warning, func', [ 
-	(UserWarning, lambda: cdc_20._alum_nu(2 * u.g / u.L)),
-	(UserWarning, lambda: cdc_20._pacl_nu(2 * u.g / u.L)),
-	(UserWarning, lambda: cdc_20._coag_nu(2 * u.g / u.L, 'alum')),
-	(UserWarning, lambda: cdc_20.coag_q_max_est),
-])
-
-def test_cdc_warning(warning, func):
-	pytest.warns(warning, func)