TST: Add test for too-deep non-object deprecation

This is similar to the ragged deprecation, and proofs that
gh-15611 is fixed previously.

1 files changed, 16 insertions, 0 deletions

diff --git a/numpy/core/tests/test_deprecations.py b/numpy/core/tests/test_deprecations.py
index 239d20c9d..68502adda 100644
--- a/numpy/core/tests/test_deprecations.py
+++ b/numpy/core/tests/test_deprecations.py
@@ -537,6 +537,22 @@ def test_deprecate_ragged_arrays():
         np.array(arg)
 
 
+class TestTooDeepDeprecation(_VisibleDeprecationTestCase):
+    # NumPy 1.20, 2020-05-08
+    # This is a bit similar to the above ragged array deprecation case.
+    message = re.escape("Creating an ndarray from nested sequences exceeding")
+
+    def test_deprecation(self):
+        nested = [1]
+        for i in range(np.MAXDIMS - 1):
+            nested = [nested]
+        self.assert_not_deprecated(np.array, args=(nested,))
+        self.assert_not_deprecated(np.array,
+                args=(nested,), kwargs=dict(dtype=object))
+
+        self.assert_deprecated(np.array, args=([nested],))
+
+
 class TestToString(_DeprecationTestCase):
     # 2020-03-06 1.19.0
     message = re.escape("tostring() is deprecated. Use tobytes() instead.")