1 files changed, 10 insertions, 0 deletions
diff --git a/tests/hazmat/backends/test_openssl.py b/tests/hazmat/backends/test_openssl.py
index 8e765dd4..44fd3db4 100644
--- a/tests/hazmat/backends/test_openssl.py
+++ b/tests/hazmat/backends/test_openssl.py
@@ -453,6 +453,16 @@ class TestOpenSSLSignX509Certificate(object):
             )
 
 
+class TestOpenSSLSignX509CSR(object):
+    def test_requires_csr_builder(self):
+        private_key = RSA_KEY_2048.private_key(backend)
+
+        with pytest.raises(TypeError):
+            backend.create_x509_csr(
+                object(), private_key, DummyHashAlgorithm()
+            )
+
+
 class TestOpenSSLSignX509CertificateRevocationList(object):
     def test_invalid_builder(self):
         private_key = RSA_KEY_2048.private_key(backend)