fix: update test expectations after removing Content-Type header

Author: chalmerlowe

google/auth/aws.py

@@ -530,9 +530,11 @@ def _get_metadata_security_credentials(
             google.auth.exceptions.RefreshError: If an error occurs while
                 retrieving the AWS security credentials.
         """
-        headers = None
         if imdsv2_session_token is not None:
             headers = {"X-aws-ec2-metadata-token": imdsv2_session_token}
+        else:
+            headers = None
+
 
         response = request(
             url="{}/{}".format(self._security_credentials_url, role_name),

tests/test_aws.py

@@ -1430,7 +1430,6 @@ def test_retrieve_subject_token_success_temp_creds_no_environment_vars_idmsv2(
             new_request.call_args_list[2][1],
             "{}/{}".format(SECURITY_CREDS_URL, self.AWS_ROLE),
             {
-                "Content-Type": "application/json",
                 "X-aws-ec2-metadata-token": self.AWS_IMDSV2_SESSION_TOKEN,
             },
         )
@@ -1487,7 +1486,6 @@ def test_retrieve_subject_token_success_temp_creds_environment_vars_missing_secr
             request.call_args_list[2][1],
             "{}/{}".format(SECURITY_CREDS_URL, self.AWS_ROLE),
             {
-                "Content-Type": "application/json",
                 "X-aws-ec2-metadata-token": self.AWS_IMDSV2_SESSION_TOKEN,
             },
         )
@@ -1544,7 +1542,6 @@ def test_retrieve_subject_token_success_temp_creds_environment_vars_missing_acce
             request.call_args_list[2][1],
             "{}/{}".format(SECURITY_CREDS_URL, self.AWS_ROLE),
             {
-                "Content-Type": "application/json",
                 "X-aws-ec2-metadata-token": self.AWS_IMDSV2_SESSION_TOKEN,
             },
         )
@@ -1595,7 +1592,6 @@ def test_retrieve_subject_token_success_temp_creds_environment_vars_missing_cred
             request.call_args_list[2][1],
             "{}/{}".format(SECURITY_CREDS_URL, self.AWS_ROLE),
             {
-                "Content-Type": "application/json",
                 "X-aws-ec2-metadata-token": self.AWS_IMDSV2_SESSION_TOKEN,
             },
         )