Add test case.

Tests/test_file_png.py

@@ -786,18 +786,20 @@ class TestTruncatedPngPLeaks(PillowLeakTestCase):
     iterations = 100  # Leak is 56k/iteration, this will leak 5.6megs
 
     def test_leak_load(self):
-        with open("Tests/images/hopper.png", "rb") as f:
-            DATA = BytesIO(f.read(16 * 1024))
+        files = ['Tests/images/hopper.png', 'Tests/images/end_trunc_file.png']
+        for file in files:
+            with open(file, "rb") as f:
+                DATA = BytesIO(f.read(16 * 1024))
 
-        ImageFile.LOAD_TRUNCATED_IMAGES = True
-        with Image.open(DATA) as im:
-            im.load()
-
-        def core():
+            ImageFile.LOAD_TRUNCATED_IMAGES = True
             with Image.open(DATA) as im:
                 im.load()
 
-        try:
-            self._test_leak(core)
-        finally:
-            ImageFile.LOAD_TRUNCATED_IMAGES = False
+            def core():
+                with Image.open(DATA) as im:
+                    im.load()
+
+            try:
+                self._test_leak(core)
+            finally:
+                ImageFile.LOAD_TRUNCATED_IMAGES = False