Fix fixture

Author: echedey-ls

pvlib/tests/test_shading.py

@@ -310,6 +310,7 @@ def test_shaded_fraction1d(sf1d_premises_and_expected):
     assert isinstance(sf_vec, pd.Series)
 
 
+@pytest.fixture
 def martinez_shade_factor_Table2():
     """
     Data provided in Table 2, [1] of martinez_shade_factor