Lambda functions allow assertRaises without errors.

Implemented display_single_image function. 

Searching for a way to run all tests at the same time.

tippy/display_operations.py

@@ -10,16 +10,28 @@ Created on Nov 19, 2011
 import sys
 import cv
 
-def display_single_image(img, name="Image", x_pos=0, y_pos=0, wait=0):
+def display_single_image(img, name="Image", x_pos=0, y_pos=0, delay=0):
     """
     Displays an image on screen.
     Position can be chosen, and time on screen too.
-    Wait is diplay time, in milliseconds.
-    If wait =0, the Image stays on screen until user interaction.
+    Delay corresponds to the diplay time, in milliseconds.
+    If delay =0, the Image stays on screen until user interaction.
     ----
     Ex:
     img = cv.LoadImage("../data/tippy.jpg", cv.CV_LOAD_IMAGE_GRAYSCALE)
     display_single_image(img, "My Tippy", 0, 0, 100)
     """
     #TODO: Still not implemented!
-    pass
+    
+    if not isinstance(name, str):
+        raise TypeError("(%s) Name :String expected!" % (sys._getframe().f_code.co_name))
+    if (not isinstance(x_pos, int)) \
+        or (not isinstance(x_pos, int)) \
+        or (not isinstance(x_pos, int)) : # TODO: find more pythonic way to do that ! 
+            raise TypeError("(%s) Int expected!" % (sys._getframe().f_code.co_name))
+
+    cv.NamedWindow(name)
+    cv.MoveWindow(name, x_pos, y_pos)
+    cv.ShowImage(name, img)
+    cv.WaitKey(delay)
+    

tippy/tests/test_basic_operations.py

@@ -37,7 +37,7 @@ class Test(unittest.TestCase):
             self.assertEqual(img.nChannels, out_img.nChannels)
             self.assertEqual(img.depth, out_img.depth)
             self.assertEqual(cv.GetSize(img), cv.GetSize(out_img))
-        self.assertRaises(TypeError, bo.create_same_image(self.fake_img)) #TODO: Problem here :s
+        self.assertRaises(TypeError, lambda: bo.create_same_image(self.fake_img))
         
-if __name__ == "__main__":
-    unittest.main()
+#if __name__ == "__main__":
+    #unittest.main()

tippy/tests/test_display_operations.py

@@ -30,9 +30,9 @@ class Test(unittest.TestCase):
     ## TESTS
     def test_display_single_image(self):
         #exception still to be found!
-        self.assertRaises(TypeError, display_single_image(self.img, x_pos="A"))
-        self.assertRaises(TypeError, display_single_image(self.img, name=2))
-        self.assertRaises(TypeError, display_single_image(self.fake_img ))
+        self.assertRaises(TypeError, lambda: do.display_single_image(self.img, x_pos="A"))
+        self.assertRaises(TypeError, lambda: do.display_single_image(self.img, name=2))
+        self.assertRaises(TypeError, lambda: do.display_single_image(self.fake_img ))
 
-if __name__ == "__main__":
-    unittest.main()
+#if __name__ == "__main__":
+    #unittest.main()