fix(storage): fix system test and change scope for iam access token (#47)

* fix(storage): change scope for iam access token * fix: narrow scope * fix: trailing commas * chore: blacken Co-authored-by: Christopher Wilcox <crwilcox@google.com>

Author: HemangChothani

tests/system.py

@@ -968,8 +968,8 @@ def _create_signed_read_url_helper(
  method=method,
  client=Config.CLIENT,
  version=version,
- service_account_email=None,
- access_token=None,
+ service_account_email=service_account_email,
+ access_token=access_token,
  )
 
  headers = {}
@@ -1046,7 +1046,10 @@ def test_create_signed_read_url_v2_w_access_token(self):
  client = iam_credentials_v1.IAMCredentialsClient()
  service_account_email = Config.CLIENT._credentials.service_account_email
  name = client.service_account_path("-", service_account_email)
- scope = ["https://www.googleapis.com/auth/devstorage.read_write"]
+ scope = [
+ "https://www.googleapis.com/auth/devstorage.read_write",
+ "https://www.googleapis.com/auth/iam",
+ ]
  response = client.generate_access_token(name, scope)
  self._create_signed_read_url_helper(
  service_account_email=service_account_email,
@@ -1057,7 +1060,10 @@ def test_create_signed_read_url_v4_w_access_token(self):
  client = iam_credentials_v1.IAMCredentialsClient()
  service_account_email = Config.CLIENT._credentials.service_account_email
  name = client.service_account_path("-", service_account_email)
- scope = ["https://www.googleapis.com/auth/devstorage.read_write"]
+ scope = [
+ "https://www.googleapis.com/auth/devstorage.read_write",
+ "https://www.googleapis.com/auth/iam",
+ ]
  response = client.generate_access_token(name, scope)
  self._create_signed_read_url_helper(
  version="v4",