feat(trials): tick_boot_days counts distinct boot-days

tests/test_trials.py

@@ -25,3 +25,31 @@ def test_start_trial_is_idempotent_resets(tracker):
     tracker.start_trial("Some-Pack")
     tracker.start_trial("Some-Pack")
     assert len(tracker.get_trials()) == 1
+
+
+def _ahead(days):
+    return datetime.now(timezone.utc) + timedelta(days=days)
+
+
+def test_tick_increments_only_on_new_day(tracker):
+    tracker.start_trial("Pack")          # enable day, counter 0
+    tracker.tick_boot_days()             # same day -> no change
+    assert tracker.get_trials()[0]["unused_boot_days"] == 0
+
+    with patch("tracker.datetime") as m:
+        m.now.return_value = _ahead(1)
+        tracker.tick_boot_days()         # new day -> 1
+        tracker.tick_boot_days()         # same (mocked) day -> still 1
+    assert tracker.get_trials()[0]["unused_boot_days"] == 1
+
+
+def test_tick_reaches_expiry(tracker):
+    tracker.start_trial("Pack")
+    for d in range(1, DEFAULT_TRIAL_BUDGET + 1):
+        with patch("tracker.datetime") as m:
+            m.now.return_value = _ahead(d)
+            tracker.tick_boot_days()
+    t = tracker.get_trials()[0]
+    assert t["unused_boot_days"] == DEFAULT_TRIAL_BUDGET
+    assert t["expired"] is True
+    assert t["days_remaining"] == 0