tests: adapt import StringIO to run tests in python3 (#40012)

tests/test_cook.py

@@ -1,6 +1,6 @@
 import os
 import json
-import StringIO
+from django.utils.six import StringIO
 
 import pytest
 from mock import call, mock_open, patch, Mock

tests/test_hobo_deploy.py

@@ -1,6 +1,5 @@
 """ unit tests (mainly for code coverage)
 """
-import StringIO
 import os
 import sys
 
@@ -9,6 +8,8 @@ import pytest
 from mock import call, patch, Mock
 from requests import Response, exceptions
 
+from django.utils.six import StringIO
+
 from hobo.agent.common.management.commands.hobo_deploy import (
     replace_file, Command, CommandError)
 from hobo.agent.hobo.management.commands.hobo_deploy import Command as HoboCommand
@@ -87,14 +88,14 @@ def test_handle_from_scratch():
     # handle from file
     command.deploy.reset_mock()
     with patch('hobo.agent.common.management.commands.hobo_deploy.open') as mocked_open:
-        mocked_open.side_effect = [StringIO.StringIO(CONTENT)]
+        mocked_open.side_effect = [StringIO(CONTENT)]
         command.handle('https://combo.dev.publik.love/', 'envbof.json')
     assert command.deploy.mock_calls == EXPECTED
 
     # handle using a pipe
     command.deploy.reset_mock()
     backup = sys.stdin
-    sys.stdin = StringIO.StringIO(CONTENT)
+    sys.stdin = StringIO(CONTENT)
     command.handle('https://combo.dev.publik.love/', '-')
     sys.stdin = backup
     assert command.deploy.mock_calls == EXPECTED
@@ -102,7 +103,7 @@ def test_handle_from_scratch():
     # JSON having syntax error
     command.deploy.reset_mock()
     with patch('hobo.agent.common.management.commands.hobo_deploy.open') as mocked_open:
-        mocked_open.side_effect = [StringIO.StringIO('malformated JSON')]
+        mocked_open.side_effect = [StringIO('malformated JSON')]
         with pytest.raises(ValueError, match='No JSON object could be decoded'):
             command.handle('https://combo.dev.publik.love/', 'env.json')
     assert command.deploy.mock_calls == []

tests_passerelle/test_deploy.py

@@ -5,7 +5,7 @@ import sys
 from hobo.multitenant.middleware import TenantMiddleware
 from django.core.management import call_command
 from django.db import connection
-import StringIO
+from django.utils.six import StringIO
 
 from passerelle.utils import export_site
 os.sys.path.append('%s/tests' % os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
@@ -41,7 +41,7 @@ def test_deploy_specifics(db, tenant_base):
         ]
     }
     old_stdin = sys.stdin
-    sys.stdin = StringIO.StringIO(json.dumps(hobo_json))
+    sys.stdin = StringIO(json.dumps(hobo_json))
     try:
         call_command('hobo_deploy', 'http://passerelle.example.net', '-')
     finally: