improve unit tests for _get_windows_libraries
diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index 84f46b2..4b51ae8 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -141,9 +141,9 @@
         assert b.lib.SSL_OP_ALL == b.lib.SSL_get_mode(ssl)
 
     def test_windows_static_dynamic_libraries(self):
-        assert len(_get_windows_libraries("static")) == 7
+        assert "ssleay32mt" in _get_windows_libraries("static")
 
-        assert len(_get_windows_libraries("dynamic")) == 3
+        assert "ssleay32" in _get_windows_libraries("dynamic")
 
         with pytest.raises(ValueError):
             _get_windows_libraries("notvalid")