Fixes #5018 -- break users on OpenSSL 1.0.1 (#5022)

* Fixes #5018 -- break users on OpenSSL 1.0.1

* Grammar

* Syntax error

* Missing import

* Missing import

1 files changed, 13 insertions, 1 deletions

diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index 29a1c459..e9bcc18e 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -4,11 +4,14 @@
 
 from __future__ import absolute_import, division, print_function
 
+import pretend
+
 import pytest
 
 from cryptography.exceptions import InternalError
 from cryptography.hazmat.bindings.openssl.binding import (
-    Binding, _consume_errors, _openssl_assert, _verify_package_version
+    Binding, _consume_errors, _openssl_assert, _verify_openssl_version,
+    _verify_package_version
 )
 
 
@@ -122,3 +125,12 @@ class TestOpenSSL(object):
     def test_version_mismatch(self):
         with pytest.raises(ImportError):
             _verify_package_version("nottherightversion")
+
+    def test_verify_openssl_version(self, monkeypatch):
+        monkeypatch.delenv("CRYPTOGRAPHY_ALLOW_OPENSSL_101", raising=False)
+        lib = pretend.stub(
+            CRYPTOGRAPHY_OPENSSL_LESS_THAN_102=True,
+            CRYPTOGRAPHY_IS_LIBRESSL=False
+        )
+        with pytest.raises(RuntimeError):
+            _verify_openssl_version(lib)