added tests for functionality in ImageTk

Tests/test_imagetk.py

@@ -1,22 +1,29 @@
-from helper import unittest, PillowTestCase
+from helper import unittest, PillowTestCase, hopper
 from PIL import Image
 
+
 try:
     from PIL import ImageTk
+    import Tkinter as tk
     dir(ImageTk)
+    HAS_TK = True
 except (OSError, ImportError) as v:
     # Skipped via setUp()
-    pass
-
+    HAS_TK = False
+    
+TK_MODES = ('1', 'L', 'P', 'RGB', 'RGBA')
 
 class TestImageTk(PillowTestCase):
 
     def setUp(self):
+        if not HAS_TK:
+            self.skipTest("Tk not installed")
         try:
-            from PIL import ImageTk
-            dir(ImageTk)
-        except (OSError, ImportError) as v:
-            self.skipTest(v)
+            # setup tk
+            app = tk.Frame()
+            #root = tk.Tk()
+        except (tk.TclError) as v:
+            self.skipTest("TCL Error: %s" % v)
 
     def test_kw(self):
         TEST_JPG = "Tests/images/hopper.jpg"
@@ -40,5 +47,47 @@ class TestImageTk(PillowTestCase):
         self.assertEqual(im, None)
 
 
+    def test_photoimage(self):
+        for mode in TK_MODES:
+            # test as image:
+            im = hopper(mode)
+            
+            # this should not crash
+            im_tk = ImageTk.PhotoImage(im)
+
+            self.assertEqual(im_tk.width(), im.width)
+            self.assertEqual(im_tk.height(), im.height)
+
+            # _tkinter.TclError: this function is not yet supported
+            #reloaded = ImageTk.getimage(im_tk)
+            #self.assert_image_equal(reloaded, im)
+
+            
+
+    def test_photoimage_blank(self):
+        # test a image using mode/size:
+        for mode in TK_MODES:
+            im_tk = ImageTk.PhotoImage(mode, (100,100))
+            
+            self.assertEqual(im_tk.width(), 100)
+            self.assertEqual(im_tk.height(), 100)
+            
+            #reloaded = ImageTk.getimage(im_tk)
+            #self.assert_image_equal(reloaded, im)
+
+    def test_bitmapimage(self):
+        im = hopper('1')
+
+        # this should not crash
+        im_tk = ImageTk.BitmapImage(im)
+        
+        self.assertEqual(im_tk.width(), im.width)
+        self.assertEqual(im_tk.height(), im.height)
+        
+        #reloaded = ImageTk.getimage(im_tk)
+        #self.assert_image_equal(reloaded, im)
+    
+
+            
 if __name__ == '__main__':
     unittest.main()