test jwk_from_pem caches jwk object

Author: cakemanny

tests/test_utils.py

@@ -0,0 +1,27 @@
+from oauth2_provider import utils
+
+
+def test_jwk_from_pem_caches_jwk():
+    a_tiny_rsa_key = """-----BEGIN RSA PRIVATE KEY-----
+MGQCAQACEQCxqYaL6GtPooVMhVwcZrCfAgMBAAECECyNmdsuHvMqIEl9/Fex27kC
+CQDlc0deuSVrtQIJAMY4MTw2eCeDAgkA5VzfMykQ5yECCQCgkF4Zl0nHPwIJALPv
++IAFUPv3
+-----END RSA PRIVATE KEY-----"""
+
+    # For the same private key we expect the same object to be returned
+
+    jwk1 = utils.jwk_from_pem(a_tiny_rsa_key)
+    jwk2 = utils.jwk_from_pem(a_tiny_rsa_key)
+
+    assert jwk1 is jwk2
+
+    a_different_tiny_rsa_key = """-----BEGIN RSA PRIVATE KEY-----
+MGMCAQACEQCvyNNNw4J201yzFVogcfgnAgMBAAECEE3oXe5bNlle+xU4EVHTUIEC
+CQDpSvwIvDMSIQIJAMDk47DzG9FHAghtvg1TWpy3oQIJAL6NHlS+RBufAgkA6QLA
+2GK4aDc=
+-----END RSA PRIVATE KEY-----"""
+
+    # But for a different key, a different object
+    jwk3 = utils.jwk_from_pem(a_different_tiny_rsa_key)
+
+    assert jwk3 is not jwk1