Prevent atmos_refract docstring typo regression

Add tests to ensure parameter name is documented as 'atmos_refract'
(not 'atmos_refrac') in spa_python and solar_position docstrings.

Related to pvlib#2532

Author: josephradford

tests/test_solarposition.py

@@ -86,6 +86,15 @@ def expected_rise_set_ephem():
                         index=times)
 
 
+def test_spa_python_atmos_refract_spelling():
+    """Test that parameter name is 'atmos_refract' not 'atmos_refrac'."""
+    import re
+    # Check for 'atmos_refrac' not followed by 't' (i.e., the typo)
+    pattern = r'atmos_refrac(?!t)'
+    assert not re.search(pattern, solarposition.spa_python.__doc__), \
+        "Found typo 'atmos_refrac' in spa_python docstring. Should be 'atmos_refract'"
+
+
 # the physical tests are run at the same time as the NREL SPA test.
 # pyephem reproduces the NREL result to 2 decimal places.
 # this doesn't mean that one code is better than the other.

tests/test_spa.py

@@ -89,6 +89,15 @@
 mix_month_actual = mix_year_actual
 
 
+def test_solar_position_atmos_refract_spelling():
+    """Test that parameter name is 'atmos_refract' not 'atmos_refrac'."""
+    import re
+    # Check for 'atmos_refrac' not followed by 't' (i.e., the typo)
+    pattern = r'atmos_refrac(?!t)'
+    assert not re.search(pattern, pvlib.spa.solar_position.__doc__), \
+        "Found typo 'atmos_refrac' in solar_position docstring. Should be 'atmos_refract'"
+
+
 class SpaBase:
     """Test functions common to numpy and numba spa"""
     def test_julian_day_dt(self):