Add coverage exclusion comments to certain test suite functions (#993)

* add coverage exclusion comments

* rename .codecov.yml -> codecov.yml

* switch up order of codecov.yml entries

* simplify path regex; codecov validator doesn't like the existing one

* Revert "switch up order of codecov.yml entries"

This reverts commit c65209a.

* exclude __name__ __main__

Author: kandersolar

.codecov.yml renamed to codecov.yml

@@ -18,7 +18,7 @@ coverage:
         if_not_found: success
         if_ci_failed: failure
         paths:
-          - "pvlib/(\w+/)?[^/]+\.py$"
+          - "pvlib/.*"
       tests:
         target: 95%
         paths:

pvlib/tests/iotools/test_ecmwf_macc.py

@@ -76,7 +76,7 @@ def test_read_ecmwf_macc(expected_test_data):
 
 
 def _create_test_data(datafile=DATAFILE, testfile=TESTDATA, start=START,
-                      end=END, resize=RESIZE):
+                      end=END, resize=RESIZE):  # pragma: no cover
     """
     Create test data from downloaded data.
 

pvlib/tests/test_numerical_precision.py

@@ -55,7 +55,7 @@
     sy_exp = NotImplemented
 
 
-def generate_numerical_precision():
+def generate_numerical_precision():  # pragma: no cover
     """
     Generate expected data with infinite numerical precision using SymPy.
     :return: dataframe of expected values
@@ -118,7 +118,7 @@ def test_numerical_precision():
     assert np.allclose(expected['grad2p'], results[7])
 
 
-if __name__ == '__main__':
+if __name__ == '__main__':  # pragma: no cover
     expected = generate_numerical_precision()
     expected.to_csv(DATA_PATH)
     test_numerical_precision()