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diff --git a/tests/hypothesis/test_padding.py b/tests/hypothesis/test_padding.py
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+++ b/tests/hypothesis/test_padding.py
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+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from hypothesis import given
+from hypothesis.strategies import binary, integers
+
+from cryptography.hazmat.primitives.padding import PKCS7
+
+
+@given(integers(min_value=1, max_value=31), binary())
+def test_pkcs7(block_size, data):
+    # Generate in [1, 31] so we can easily get block_size in bits by
+    # multiplying by 8.
+    p = PKCS7(block_size=block_size * 8)
+    padder = p.padder()
+    unpadder = p.unpadder()
+
+    padded = padder.update(data) + padder.finalize()
+
+    assert unpadder.update(padded) + unpadder.finalize() == data