#106: tests: aircox_streamer (#110)

- Writes tests for aircox streamer application;
- Add test utilities in aircox

Co-authored-by: bkfox <thomas bkfox net>
Reviewed-on: rc/aircox#110

aircox_streamer/tests/test_controllers_streamers.py

@@ -0,0 +1,37 @@
+from datetime import timedelta
+
+from django.utils import timezone as tz
+import pytest
+
+
+class TestStreamers:
+    @pytest.fixture
+    def test___init__(self, streamers):
+        assert isinstance(streamers.timeout, timedelta)
+
+    @pytest.fixture
+    def test_reset(self, streamers, stations):
+        streamers.reset()
+        assert all(
+            streamers.streamers[station.pk] == station for station in stations
+        )
+
+    @pytest.fixture
+    def test_fetch(self, streamers):
+        streamers.next_date = tz.now() - tz.timedelta(seconds=30)
+        streamers.streamers = None
+
+        now = tz.now()
+        streamers.fetch()
+
+        assert all(streamer.calls.get("fetch") for streamer in streamers)
+        assert streamers.next_date > now
+
+    @pytest.fixture
+    def test_fetch_timeout_not_reached(self, streamers):
+        next_date = tz.now() + tz.timedelta(seconds=30)
+        streamers.next_date = next_date
+
+        streamers.fetch()
+        assert all(not streamer.calls.get("fetch") for streamer in streamers)
+        assert streamers.next_date == next_date