Convert Unittest testcases with setup/teardown to fixtures (#1240)

* Unwrap testcases with setup/teardown

* Unwrap CLI testcases

* De-global pot_file

Author: akx

tests/messages/consts.py

@@ -9,7 +9,6 @@
 data_dir = os.path.join(this_dir, 'data')
 project_dir = os.path.join(data_dir, 'project')
 i18n_dir = os.path.join(project_dir, 'i18n')
-pot_file = os.path.join(i18n_dir, 'temp.pot')
 
 
 def get_po_file_path(locale):

tests/messages/frontend/conftest.py

@@ -0,0 +1,9 @@
+import pathlib
+import time
+
+import pytest
+
+
+@pytest.fixture
+def pot_file(tmp_path) -> pathlib.Path:
+    return tmp_path / f'po-{time.time()}.pot'