formatting, add deprecation test

Author: cwhanse

pvlib/irradiance.py

@@ -2298,7 +2298,7 @@ def liujordan(zenith, transmittance, airmass, dni_extra=1367.0):
 
 
 liujordan = deprecated('0.8', alternative='campbellnormam',
-                         name='liujordan', removal='0.9')(liujordan)
+                       name='liujordan', removal='0.9')(liujordan)
 
 
 def _get_perez_coefficients(perezmodel):

pvlib/tests/test_irradiance.py

@@ -13,7 +13,8 @@
 
 from pvlib import irradiance
 
-from conftest import requires_ephem, requires_numba
+from conftest import requires_ephem, requires_numba, fail_on_pvlib_version
+from pvlib._deprecation import pvlibDeprecationWarning
 
 
 # fixtures create realistic test input data
@@ -939,3 +940,11 @@ def test_clearness_index_zenith_independent(airmass_kt):
                                                         airmass)
     expected = pd.Series([np.nan, 0.553744437562], index=times)
     assert_series_equal(out, expected)
+
+
+@fail_on_pvlib_version('0.9')
+def test_deprecated_09():
+    # deprecated function irradiance.liujordan
+    with pytest.warns(pvlibDeprecationWarning):
+        irradiance.liujordan(
+        pd.Series([10]), pd.Series([0.5]), pd.Series([1.1]), dni_extra=1400)