diff --git a/Tests/test_file_jpeg.py b/Tests/test_file_jpeg.py
index 7b58fc426..f46414370 100644
--- a/Tests/test_file_jpeg.py
+++ b/Tests/test_file_jpeg.py
@@ -119,7 +119,7 @@ class TestFileJpeg(PillowTestCase):
             # using a 4-byte test code should allow us to detect out of
             # order issues.
             icc_profile = (b"Test"*int(n/4+1))[:n]
-            assert len(icc_profile) == n  # sanity
+            self.assertEqual(len(icc_profile), n)  # sanity
             im1 = self.roundtrip(hopper(), icc_profile=icc_profile)
             self.assertEqual(im1.info.get("icc_profile"), icc_profile or None)
         test(0)
diff --git a/Tests/test_image_quantize.py b/Tests/test_image_quantize.py
index d9f52fb03..6a9ff1187 100644
--- a/Tests/test_image_quantize.py
+++ b/Tests/test_image_quantize.py
@@ -27,14 +27,14 @@ class TestImageQuantize(PillowTestCase):
                 raise
         self.assert_image(converted, 'P', converted.size)
         self.assert_image_similar(converted.convert('RGB'), image, 15)
-        assert len(converted.getcolors()) == 100
+        self.assertEqual(len(converted.getcolors()), 100)
 
     def test_octree_quantize(self):
         image = hopper()
         converted = image.quantize(100, Image.FASTOCTREE)
         self.assert_image(converted, 'P', converted.size)
         self.assert_image_similar(converted.convert('RGB'), image, 20)
-        assert len(converted.getcolors()) == 100
+        self.assertEqual(len(converted.getcolors()), 100)
 
     def test_rgba_quantize(self):
         image = hopper('RGBA')
diff --git a/Tests/test_image_resample.py b/Tests/test_image_resample.py
index ee5a062c6..4223db530 100644
--- a/Tests/test_image_resample.py
+++ b/Tests/test_image_resample.py
@@ -422,7 +422,7 @@ class CoreResampleBoxTest(PillowTestCase):
 
     def test_tiles(self):
         im = Image.open("Tests/images/flower.jpg")
-        assert im.size == (480, 360)
+        self.assertEqual(im.size, (480, 360))
         dst_size = (251, 188)
         reference = im.resize(dst_size, Image.BICUBIC)
 
@@ -434,7 +434,7 @@ class CoreResampleBoxTest(PillowTestCase):
         # This test shows advantages of the subpixel resizing
         # after supersampling (e.g. during JPEG decoding).
         im = Image.open("Tests/images/flower.jpg")
-        assert im.size == (480, 360)
+        self.assertEqual(im.size, (480, 360))
         dst_size = (48, 36)
         # Reference is cropped image resized to destination
         reference = im.crop((0, 0, 473, 353)).resize(dst_size, Image.BICUBIC)