test: pin empty ACTOR_BUILD_TAGS to the unset behavior

Author: vdusek

tests/unit/actor/test_actor_env_helpers.py

@@ -166,8 +166,10 @@ async def test_get_env_with_randomized_env_vars(monkeypatch: pytest.MonkeyPatch,
 
         list_get_env_var = list_env_var.name.lower()
         expected_value_count = random.randint(0, len(available_values))
-        expected_get_env[list_get_env_var] = random.sample(available_values, expected_value_count)
-        monkeypatch.setenv(list_env_var, ','.join(expected_get_env[list_get_env_var]))
+        expected_values = random.sample(available_values, expected_value_count)
+        monkeypatch.setenv(list_env_var, ','.join(expected_values))
+        # An env var exported as an empty string counts as unset, same as a missing one.
+        expected_get_env[list_get_env_var] = expected_values or None
 
         # Test behavior with missing env var in case of empty list
         if expected_value_count == 0 and random.random() < 0.5:

tests/unit/actor/test_configuration.py

@@ -410,6 +410,7 @@ def test_actor_storage_json_env_var(monkeypatch: pytest.MonkeyPatch) -> None:
         pytest.param('ACTOR_WEB_SERVER_PORT', 'web_server_port', 4321, id='web_server_port'),
         pytest.param('APIFY_CHARGED_ACTOR_EVENT_COUNTS', 'charged_event_counts', None, id='charged_event_counts'),
         pytest.param('ACTOR_INPUT_KEY', 'input_key', 'INPUT', id='input_key'),
+        pytest.param('ACTOR_BUILD_TAGS', 'actor_build_tags', None, id='actor_build_tags'),
         pytest.param('CRAWLEE_PURGE_ON_START', 'purge_on_start', True, id='purge_on_start'),
     ],
 )