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-rw-r--r--numpy/matrixlib/__init__.py2
-rw-r--r--numpy/matrixlib/tests/test_defmatrix.py8
2 files changed, 9 insertions, 1 deletions
diff --git a/numpy/matrixlib/__init__.py b/numpy/matrixlib/__init__.py
index 3ad3a9549..777e0cd33 100644
--- a/numpy/matrixlib/__init__.py
+++ b/numpy/matrixlib/__init__.py
@@ -7,6 +7,6 @@ from .defmatrix import *
__all__ = defmatrix.__all__
-from numpy.testing._private.pytesttester import PytestTester
+from numpy._pytesttester import PytestTester
test = PytestTester(__name__)
del PytestTester
diff --git a/numpy/matrixlib/tests/test_defmatrix.py b/numpy/matrixlib/tests/test_defmatrix.py
index e74e83cdb..272cd8d52 100644
--- a/numpy/matrixlib/tests/test_defmatrix.py
+++ b/numpy/matrixlib/tests/test_defmatrix.py
@@ -466,3 +466,11 @@ class TestShape(object):
def test_matrix_memory_sharing(self):
assert_(np.may_share_memory(self.m, self.m.ravel()))
assert_(not np.may_share_memory(self.m, self.m.flatten()))
+
+ def test_expand_dims_matrix(self):
+ # matrices are always 2d - so expand_dims only makes sense when the
+ # type is changed away from matrix.
+ a = np.arange(10).reshape((2, 5)).view(np.matrix)
+ expanded = np.expand_dims(a, axis=1)
+ assert_equal(expanded.ndim, 3)
+ assert_(not isinstance(expanded, np.matrix))