a separate test for scalars base on review comments

1 files changed, 11 insertions, 1 deletions

diff --git a/numpy/testing/tests/test_utils.py b/numpy/testing/tests/test_utils.py
index c1e9fd237..44f93a693 100644
--- a/numpy/testing/tests/test_utils.py
+++ b/numpy/testing/tests/test_utils.py
@@ -564,7 +564,8 @@ class TestAlmostEqual(_GenericTest):
         assert_equal(msgs[4], 'Max absolute difference: 2')
         assert_equal(msgs[5], 'Max relative difference: inf')
 
-        # check the error message when x is scalar
+    def test_error_message_2(self):
+        """Check the message is formatted correctly when either x or y is a scalar."""
         x = 2
         y = np.ones(20)
         with pytest.raises(AssertionError) as exc_info:
@@ -574,6 +575,15 @@ class TestAlmostEqual(_GenericTest):
         assert_equal(msgs[4], 'Max absolute difference: 1.')
         assert_equal(msgs[5], 'Max relative difference: 1.')
 
+        y = 2
+        x = np.ones(20)
+        with pytest.raises(AssertionError) as exc_info:
+            self._assert_func(x, y)
+        msgs = str(exc_info.value).split('\n')
+        assert_equal(msgs[3], 'Mismatched elements: 20 / 20 (100%)')
+        assert_equal(msgs[4], 'Max absolute difference: 1.')
+        assert_equal(msgs[5], 'Max relative difference: 0.5')
+
     def test_subclass_that_cannot_be_bool(self):
         # While we cannot guarantee testing functions will always work for
         # subclasses, the tests should ideally rely only on subclasses having