diff --git a/tests/oauth2/test_service_account.py b/tests/oauth2/test_service_account.py
index 1bce670..c4c1d1b 100644
--- a/tests/oauth2/test_service_account.py
+++ b/tests/oauth2/test_service_account.py
@@ -111,19 +111,6 @@
         assert credentials._subject == subject
         assert credentials._additional_claims == additional_claims
 
-    def test_to_jwt_credentials(self):
-        jwt_from_svc = self.credentials.to_jwt_credentials(
-            audience=mock.sentinel.audience)
-        jwt_from_info = jwt.Credentials.from_service_account_info(
-            SERVICE_ACCOUNT_INFO,
-            audience=mock.sentinel.audience)
-
-        assert isinstance(jwt_from_svc, jwt.Credentials)
-        assert jwt_from_svc._signer.key_id == jwt_from_info._signer.key_id
-        assert jwt_from_svc._issuer == jwt_from_info._issuer
-        assert jwt_from_svc._subject == jwt_from_info._subject
-        assert jwt_from_svc._audience == jwt_from_info._audience
-
     def test_default_state(self):
         assert not self.credentials.valid
         # Expiration hasn't been set yet
diff --git a/tests/test_jwt.py b/tests/test_jwt.py
index 0716fc3..59769de 100644
--- a/tests/test_jwt.py
+++ b/tests/test_jwt.py
@@ -258,6 +258,20 @@
         assert credentials._audience == self.AUDIENCE
         assert credentials._additional_claims == self.ADDITIONAL_CLAIMS
 
+    def test_from_signing_credentials(self):
+        jwt_from_signing = self.credentials.from_signing_credentials(
+            self.credentials,
+            audience=mock.sentinel.new_audience)
+        jwt_from_info = jwt.Credentials.from_service_account_info(
+            SERVICE_ACCOUNT_INFO,
+            audience=mock.sentinel.new_audience)
+
+        assert isinstance(jwt_from_signing, jwt.Credentials)
+        assert jwt_from_signing._signer.key_id == jwt_from_info._signer.key_id
+        assert jwt_from_signing._issuer == jwt_from_info._issuer
+        assert jwt_from_signing._subject == jwt_from_info._subject
+        assert jwt_from_signing._audience == jwt_from_info._audience
+
     def test_default_state(self):
         assert not self.credentials.valid
         # Expiration hasn't been set yet