update test error messages for merge type errors

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")