test for font memory leaks

Tests/test_font_leaks.py

@@ -0,0 +1,34 @@
+from __future__ import division
+from helper import unittest, PillowLeakTestCase
+import sys
+from PIL import Image, features, ImageDraw, ImageFont
+
+@unittest.skipIf(sys.platform.startswith('win32'), "requires Unix or MacOS")
+class TestTTypeFontLeak(PillowLeakTestCase):
+    # fails at iteration 3 in master
+    iterations = 10
+    mem_limit = 4096 #k
+
+    def _test_font(self, font):
+        im = Image.new('RGB', (255,255), 'white')
+        draw = ImageDraw.ImageDraw(im)
+        self._test_leak(lambda: draw.text((0, 0), "some text "*1024, #~10k
+                                          font=font, fill="black"))
+            
+    @unittest.skipIf(not features.check('freetype2'), "Test requires freetype2")
+    def test_leak(self):
+        ttype = ImageFont.truetype('Tests/fonts/FreeMono.ttf', 20)
+        self._test_font(ttype)
+
+class TestDefaultFontLeak(TestTTypeFontLeak):
+    # fails at iteration 37 in master
+    iterations = 100
+    mem_limit = 1024 #k
+    
+    def test_leak(self):
+        default_font = ImageFont.load_default()
+        self._test_font(default_font)
+
+
+if __name__ == '__main__':
+    unittest.main()