add new test

Author: cwhanse

tests/test_temperature.py

@@ -273,6 +273,15 @@ def test_fuentes_timezone(tz):
 
     assert_series_equal(out, pd.Series([48.042, 51.845, 51.846], index=index,
                                        name='tmod'))
+    # GH 2608
+    df = pd.DataFrame({'poa_global': 1000., 'temp_air': 20., 'wind_speed': 1.},
+                       index)
+
+    out = temperature.fuentes(df['poa_global'], df['temp_air'],
+                              df['wind_speed'], noct_installed=45)
+
+    assert_series_equal(out, pd.Series([48.042, 51.845, 51.846], index=index,
+                                       name='tmod'))
 
 
 def test_noct_sam():