Fix test

Author: snitish

pandas/tests/frame/methods/test_join.py

@@ -287,7 +287,10 @@ def test_join_index(float_frame):
     tm.assert_index_equal(joined.index, float_frame.index[10:][::-1])
     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, "
+        "left_anti, right_anti, cross, asof"
+    )
     with pytest.raises(ValueError, match=re.escape(join_msg)):
         f.join(f2, how="foo")