first commit

backend/tests/test_scheduler.py

@@ -0,0 +1,24 @@
+from app.core.cron_utils import CronValidationError, describe_cron_expression, preview_next_runs, validate_cron_expression
+
+
+def test_validate_cron_expression_accepts_daily_schedule():
+    validate_cron_expression('15 2 * * *', 'Europe/Warsaw')
+
+
+def test_validate_cron_expression_rejects_invalid_schedule():
+    try:
+        validate_cron_expression('bad cron', 'Europe/Warsaw')
+    except CronValidationError:
+        assert True
+        return
+    assert False, 'invalid cron should raise'
+
+
+def test_preview_next_runs_returns_future_datetimes():
+    runs = preview_next_runs('0 3 * * 1', 'Europe/Warsaw', count=2)
+    assert len(runs) == 2
+    assert runs[0] < runs[1]
+
+
+def test_describe_cron_expression_humanizes_common_patterns():
+    assert describe_cron_expression('0 2 * * *') == 'Every day at 02:00'