Move test_no_resource_warning_for_numpy_array to test_numpy so it can be skipped easily

Tests/test_image.py

@@ -514,16 +514,6 @@ class TestImage(PillowTestCase):
         with Image.open(test_file) as im:
             self.assert_warning(None, lambda: im.save('test_img.jpg'))
 
-    def test_no_resource_warning_for_numpy_array(self):
-        # https://github.com/python-pillow/Pillow/issues/835
-        # Arrange
-        from numpy import array
-        test_file = 'Tests/images/hopper.png'
-        im = Image.open(test_file)
-
-        # Act/Assert
-        self.assert_warning(None, lambda: array(im))
-
 
 class MockEncoder(object):
     pass

Tests/test_numpy.py

@@ -212,7 +212,6 @@ class TestNumpy(PillowTestCase):
 
         self.assertEqual(im.size, (0, 0))
 
-
     def test_bool(self):
         # https://github.com/python-pillow/Pillow/issues/2044
         a = numpy.zeros((10,2), dtype=numpy.bool)
@@ -221,5 +220,16 @@ class TestNumpy(PillowTestCase):
         im2 = Image.fromarray(a)
         self.assertEqual(im2.getdata()[0], 255)
 
+    def test_no_resource_warning_for_numpy_array(self):
+        # https://github.com/python-pillow/Pillow/issues/835
+        # Arrange
+        from numpy import array
+        test_file = 'Tests/images/hopper.png'
+        im = Image.open(test_file)
+
+        # Act/Assert
+        self.assert_warning(None, lambda: array(im))
+
+
 if __name__ == '__main__':
     unittest.main()