fix timers

backend/tests/test_pomodoro.py

@@ -69,6 +69,40 @@ def test_auto_start_breaks_rolls_straight_on(session, settings):
     assert follow_on is not None and follow_on.kind == "short_break"
 
 
+def test_a_complete_naming_a_finished_interval_does_nothing(session, settings):
+    """Two clients reaching zero at once must not cost you the break.
+
+    Every client ticks its own countdown and calls `complete` when it runs out.
+    The first call finishes the work interval and auto-starts the break; the
+    second — sent a moment earlier, from a client that has not polled since —
+    used to finish *that* break, so a break ended the instant it began.
+    """
+    settings.pomodoro.auto_start_breaks = True
+    settings.pomodoro.auto_start_work = True
+    settings_service.save_settings(session, settings)
+
+    work = pomodoro.start(session, settings, kind="work")
+    finished, follow_on = pomodoro.complete(session, settings, expect_id=work.id)
+    assert finished is not None and follow_on is not None
+    assert follow_on.kind == "short_break"
+
+    # The second client's call, naming the work interval it was still showing.
+    stale_finished, stale_follow_on = pomodoro.complete(session, settings, expect_id=work.id)
+    assert stale_finished is None and stale_follow_on is None
+
+    still_running = pomodoro.current_session(session)
+    assert still_running is not None
+    assert still_running.id == follow_on.id and still_running.status == "running"
+
+
+def test_complete_without_a_session_id_stays_unconditional(session, settings):
+    settings.pomodoro.auto_start_breaks = False
+    settings_service.save_settings(session, settings)
+    pomodoro.start(session, settings, kind="work")
+    finished, _ = pomodoro.complete(session, settings)
+    assert finished is not None and finished.status == "completed"
+
+
 def test_strict_mode_demands_a_reason(session, settings):
     settings.pomodoro.strict_mode = True
     settings_service.save_settings(session, settings)