TST: Add a test of jagged array construction

1 files changed, 18 insertions, 0 deletions

diff --git a/numpy/core/tests/test_multiarray.py b/numpy/core/tests/test_multiarray.py
index 07d1361d6..3812a20d8 100644
--- a/numpy/core/tests/test_multiarray.py
+++ b/numpy/core/tests/test_multiarray.py
@@ -688,6 +688,9 @@ class TestScalarIndexing(object):
 
 
 class TestCreation(object):
+    """
+    Test the np.array constructor
+    """
     def test_from_attribute(self):
         class x(object):
             def __array__(self, dtype=None):
@@ -917,6 +920,21 @@ class TestCreation(object):
         assert_equal(a.shape, (3,))
         assert_equal(a.dtype, object)
 
+    def test_jagged_shape_object(self):
+        # The jagged dimension of a list is turned into an object array
+        a = np.array([[1, 1], [2], [3]])
+        assert_equal(a.shape, (3,))
+        assert_equal(a.dtype, object)
+
+        a = np.array([[1], [2, 2], [3]])
+        assert_equal(a.shape, (3,))
+        assert_equal(a.dtype, object)
+
+        a = np.array([[1], [2], [3, 3]])
+        assert_equal(a.shape, (3,))
+        assert_equal(a.dtype, object)
+
+
 class TestStructured(object):
     def test_subarray_field_access(self):
         a = np.zeros((3, 5), dtype=[('a', ('i4', (2, 2)))])