Fix failing iotools tests (#2609)

* fix solargis test; expect new error message

* sodapro: fix ME issue on old pandas

introduced in #2600

* use atol in meteonorm tests

Author: kandersolar

tests/iotools/test_meteonorm.py

@@ -124,7 +124,10 @@ def test_get_meteonorm_training(
 
     assert meta == expected_meta
     pd.testing.assert_index_equal(data.index, expected_meteonorm_index)
-    pd.testing.assert_frame_equal(data.iloc[:12], expected_meteonorm_data)
+    # meteonorm API only guarantees similar, not identical, results between
+    # calls.  so we allow a small amount of variation with atol.
+    pd.testing.assert_frame_equal(data.iloc[:12], expected_meteonorm_data,
+                                  check_exact=False, atol=1)
 
 
 @pytest.mark.remote_data
@@ -304,4 +307,7 @@ def test_get_meteonorm_tmy(
         map_variables=False,
         url=demo_url)
     assert meta == expected_meteonorm_tmy_meta
-    pd.testing.assert_frame_equal(data.iloc[:12], expected_meteonorm_tmy_data)
+    # meteonorm API only guarantees similar, not identical, results between
+    # calls.  so we allow a small amount of variation with atol.
+    pd.testing.assert_frame_equal(data.iloc[:12], expected_meteonorm_tmy_data,
+                                  check_exact=False, atol=1)

tests/iotools/test_sodapro.py

@@ -21,7 +21,8 @@
 
 index_verbose = pd.date_range('2020-06-01 12', periods=4, freq='1min',
                               tz='UTC')
-index_monthly = pd.date_range('2020-01-01', periods=4, freq='1ME')
+index_monthly = pd.to_datetime(['2020-01-31', '2020-02-29', '2020-03-31',
+                                '2020-04-30'])
 
 
 dtypes_mcclear_verbose = [

tests/iotools/test_solargis.py

@@ -65,7 +65,8 @@ def test_get_solargis_utc_start_timestamp(hourly_index_start_utc):
 @pytest.mark.flaky(reruns=RERUNS, reruns_delay=RERUNS_DELAY)
 def test_get_solargis_http_error():
     # Test if HTTPError is raised if date outside range is specified
-    with pytest.raises(requests.HTTPError, match="data coverage"):
+    match = r"request fromDate .* is before the available start date"
+    with pytest.raises(requests.HTTPError, match=match):
         _, _ = pvlib.iotools.get_solargis(
             latitude=48.61259, longitude=20.827079,
             start='1920-01-01', end='1920-01-01',  # date outside range