address comments

python/mxnet/image/image.py

@@ -88,7 +88,7 @@ def imresize(src, w, h, interp):
     r"""Resize image with OpenCV.
 
     Note: `imread` uses OpenCV (not the CV2 Python library).
-    MXNet must have been built with USE_OPENCV=1 for `imdecode` to work.
+    MXNet must have been built with USE_OPENCV=1 for `imresize` to work.
 
     Parameters
     ----------

tests/python/unittest/test_image.py

@@ -84,7 +84,7 @@ def test_imdecode(self):
         try:
             import cv2
         except ImportError:
-            return
+            raise unittest.SkipTest("Unable to import cv2.")
         for img in TestImage.IMAGES:
             with open(img, 'rb') as fp:
                 str_image = fp.read()
@@ -97,11 +97,12 @@ def test_scale_down(self):
         assert mx.image.scale_down((360, 1000), (480, 500)) == (360, 375)
         assert mx.image.scale_down((300, 400), (0, 0)) == (0, 0)
 
+    @with_seed()
     def test_resize_short(self):
         try:
             import cv2
         except ImportError:
-            return
+            raise unittest.SkipTest("Unable to import cv2")
         for img in TestImage.IMAGES:
             cv_img = cv2.imread(img)
             mx_img = mx.nd.array(cv_img[:, :, (2, 1, 0)])
@@ -118,11 +119,12 @@ def test_resize_short(self):
                     mx_resized = mx.image.resize_short(mx_img, new_size, interp)
                     assert_almost_equal(mx_resized.asnumpy()[:, :, (2, 1, 0)], cv_resized, atol=3)
 
+    @with_seed()
     def test_imresize(self):
         try:
             import cv2
         except ImportError:
-            return
+            raise unittest.SkipTest("Unable to import cv2")
         for img in TestImage.IMAGES:
             cv_img = cv2.imread(img)
             mx_img = mx.nd.array(cv_img[:, :, (2, 1, 0)])