update test error messages for merge type errors

Author: KevsterAmp

pandas/tests/frame/methods/test_join.py

@@ -277,10 +277,7 @@ def test_join_index(float_frame):
     tm.assert_index_equal(joined.index, float_frame.index.sort_values())
     tm.assert_index_equal(joined.columns, expected_columns)
 
-    join_msg = (
-        "'foo' is not a valid Merge type "
-        "('left', 'right', 'inner', 'outer', 'cross', 'asof')"
-    )
+    join_msg = "'foo' is not a valid Merge type: left, right, inner, outer, cross, asof"
     with pytest.raises(ValueError, match=re.escape(join_msg)):
         f.join(f2, how="foo")
 

pandas/tests/reshape/merge/test_merge.py

@@ -1464,10 +1464,7 @@ def test_merge_how_validation(self):
         data2 = DataFrame(
             np.arange(20).reshape((5, 4)) + 1, columns=["a", "b", "x", "y"]
         )
-        msg = (
-            "'full' is not a valid Merge type "
-            "('left', 'right', 'inner', 'outer', 'cross', 'asof')"
-        )
+        msg = "'full' is not a valid Merge type: left, right, inner, outer, cross, asof"
         with pytest.raises(ValueError, match=re.escape(msg)):
             data1.merge(data2, how="full")