test default sd_reference_illum shape

Author: tjdcs

colour/quality/tests/test_cfi2017.py

@@ -19,6 +19,7 @@
     reshape_sd,
     sd_blackbody,
 )
+from colour.colorimetry.spectrum import SPECTRAL_SHAPE_DEFAULT
 from colour.quality.cfi2017 import (
     CCT_reference_illuminant,
     colour_fidelity_index_CIE2017,
@@ -924,6 +925,14 @@ class TestSdReferenceIlluminant:
     definition unit tests methods.
     """
 
+    def test_default_args(self) -> None:
+        """Test :func:`color.quality.CIE2017.sd_reference_illuminant` for
+        default shape argument.
+        """
+
+        sd = sd_reference_illuminant(5421)
+        assert sd.shape == SPECTRAL_SHAPE_DEFAULT
+
     def test_sd_reference_illuminant(self) -> None:
         """
         Test :func:`colour.quality.CIE2017.sd_reference_illuminant`