dni() deprecation test

Author: RDaxini

pvlib/tests/test_irradiance.py

@@ -1143,6 +1143,25 @@ def test_dni():
                                    146.190220008, 573.685662283]))
 
 
+def test_dni_dni_clearsky_deprecation():
+    ghi = pd.Series([90, 100, 100, 100, 100])
+    dhi = pd.Series([100, 90, 50, 50, 50])
+    zenith = pd.Series([80, 100, 85, 70, 85])
+    dni_clear = pd.Series([50, 50, 200, 50, 300])
+
+    with pytest.warns(pvlibDeprecationWarning, match='dni_clear'):
+        dni = irradiance.dni(ghi, dhi, zenith,
+                             clearsky_dni=dni_clear, clearsky_tolerance=2)
+    assert_series_equal(dni,
+                        pd.Series([float('nan'), float('nan'), 400,
+                                   146.190220008, 573.685662283]))
+
+    dni = irradiance.dni(ghi, dhi, zenith)
+    assert_series_equal(dni,
+                        pd.Series([float('nan'), float('nan'), 573.685662283,
+                                   146.190220008, 573.685662283]))
+
+
 @pytest.mark.parametrize(
     'surface_tilt,surface_azimuth,solar_zenith,' +
     'solar_azimuth,aoi_expected,aoi_proj_expected',