1 files changed, 65 insertions, 0 deletions
diff --git a/tests/test_cryptography_utils.py b/tests/test_cryptography_utils.py
new file mode 100644
index 00000000..ddea7602
--- /dev/null
+++ b/tests/test_cryptography_utils.py
@@ -0,0 +1,65 @@
+# 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 __future__ import absolute_import, division, print_function
+
+import pytest
+
+from cryptography import utils
+
+
+def test_int_from_bytes_bytearray():
+    assert utils.int_from_bytes(bytearray(b"\x02\x10"), "big") == 528
+    with pytest.raises(TypeError):
+        utils.int_from_bytes(["list", "is", "not", "bytes"], "big")
+
+
+class TestCachedProperty(object):
+    def test_simple(self):
+        accesses = []
+
+        class T(object):
+            @utils.cached_property
+            def t(self):
+                accesses.append(None)
+                return 14
+
+        assert T.t
+        t = T()
+        assert t.t == 14
+        assert len(accesses) == 1
+        assert t.t == 14
+        assert len(accesses) == 1
+
+        t = T()
+        assert t.t == 14
+        assert len(accesses) == 2
+        assert t.t == 14
+        assert len(accesses) == 2
+
+    def test_set(self):
+        accesses = []
+
+        class T(object):
+            @utils.cached_property
+            def t(self):
+                accesses.append(None)
+                return 14
+
+        t = T()
+        with pytest.raises(AttributeError):
+            t.t = None
+        assert len(accesses) == 0
+        assert t.t == 14
+        assert len(accesses) == 1
+        with pytest.raises(AttributeError):
+            t.t = None
+        assert len(accesses) == 1
+        assert t.t == 14
+        assert len(accesses) == 1
+
+
+def test_bit_length():
+    assert utils.bit_length(1) == 1
+    assert utils.bit_length(11) == 4