1 files changed, 124 insertions, 0 deletions
diff --git a/lib/project/tests/test_gui_jobs.py b/lib/project/tests/test_gui_jobs.py
new file mode 100644
index 0000000..6116a72
--- /dev/null
+++ b/lib/project/tests/test_gui_jobs.py
@@ -0,0 +1,124 @@
+"""Bounded single-worker scheduling and cancellation through real process cleanup."""
+import os
+import sys
+import threading
+import time
+
+import pytest
+
+from producer import gui_jobs, setup
+from producer.gui import rooted
+
+
+def terminal(jobs, job_id):
+    deadline = time.monotonic() + 10
+    while time.monotonic() < deadline:
+        job = jobs.get(job_id)
+        if job["status"] in ("succeeded", "failed", "cancelled"):
+            return job
+        time.sleep(0.01)
+    pytest.fail("Job failed to finish")
+
+
+def test_single_worker_bounded_queue_and_running_process_cancellation(wav, tmp_path, monkeypatch):
+    source = wav()
+    started = threading.Event()
+    pid_file = tmp_path / "child.pid"
+    calls = []
+    def slow_scan(path, progress):
+        calls.append(path)
+        if len(calls) == 1:
+            started.set()
+            setup.run_process([sys.executable, "-c",
+                f"import os,time;open({str(pid_file)!r},'w').write(str(os.getpid()));time.sleep(60)"],
+                "Waiting for worker", progress)
+        return {"bins": 2048}
+    monkeypatch.setattr(gui_jobs, "waveform", slow_scan)
+    jobs = gui_jobs.Jobs(tmp_path, lambda value: rooted(tmp_path, value))
+    snapshot = {"path": source.name, "input_id": gui_jobs.identity(source)}
+    try:
+        first = jobs.submit("scan", snapshot)
+        assert started.wait(5)
+        # Public snapshots cannot mutate the immutable in-flight job.
+        first["snapshot"]["path"] = "missing.wav"
+        queued = [jobs.submit("scan", snapshot) for _ in range(3)]
+        with pytest.raises(gui_jobs.Busy):
+            jobs.submit("scan", snapshot)
+        assert len(calls) == 1
+        assert jobs.cancel(queued[0]["id"])["status"] == "cancelled"
+        deadline = time.monotonic() + 5
+        while not pid_file.exists() and time.monotonic() < deadline:
+            time.sleep(0.01)
+        pid = int(pid_file.read_text())
+        jobs.cancel(first["id"])
+        assert terminal(jobs, first["id"])["status"] == "cancelled"
+        with pytest.raises(ProcessLookupError):
+            os.kill(pid, 0)
+        assert terminal(jobs, queued[1]["id"])["status"] == "succeeded"
+        assert terminal(jobs, queued[2]["id"])["cached"]
+        assert len(calls) == 2
+    finally:
+        jobs.close()
+    assert not jobs.work.exists()
+
+
+def test_history_and_result_cache_are_bounded_and_evicted_media_expires(wav, tmp_path, monkeypatch):
+    source = wav()
+    monkeypatch.setattr(gui_jobs, "MAX_HISTORY", 5)
+    monkeypatch.setattr(gui_jobs, "CACHE_ENTRIES", 2)
+    def preview(path, work, snapshot, progress):
+        (work / "original.wav").write_bytes(b"preview")
+        (work / "processed.wav").write_bytes(b"preview")
+        return {}
+    monkeypatch.setattr(gui_jobs, "render_preview", preview)
+    jobs = gui_jobs.Jobs(tmp_path, lambda value: rooted(tmp_path, value))
+    snapshot = {"path": source.name, "input_id": gui_jobs.identity(source)}
+    try:
+        results = []
+        for index in range(10):
+            job = jobs.submit("preview", snapshot | {"start": index})
+            result = terminal(jobs, job["id"])
+            assert result["status"] == "succeeded", result
+            results.append(result["result"]["result_id"])
+        assert len(jobs.list()) == 5
+        assert len(jobs.cache) == 2
+        assert len(list(jobs.work.iterdir())) == 2
+        with pytest.raises(KeyError):
+            jobs.media(results[0], "original")
+        assert jobs.media(results[-1], "original") == b"preview"
+        with pytest.raises(KeyError):
+            jobs.media(results[-1], "../original")
+        # Byte budget independently evicts even below the entry-count limit.
+        monkeypatch.setattr(gui_jobs, "CACHE_BYTES", 1)
+        with jobs.condition:
+            jobs._evict()
+        assert not jobs.cache
+        assert not list(jobs.work.iterdir())
+    finally:
+        jobs.close()
+
+
+def test_queued_input_replacement_is_rejected_and_shutdown_cancels_scan(wav, tmp_path, monkeypatch):
+    source = wav()
+    started = threading.Event()
+    def scan(path, progress):
+        started.set()
+        while True:
+            progress("Scanning", 1, 10)
+            time.sleep(0.01)
+    monkeypatch.setattr(gui_jobs, "waveform", scan)
+    jobs = gui_jobs.Jobs(tmp_path, lambda value: rooted(tmp_path, value))
+    snapshot = {"path": source.name, "input_id": gui_jobs.identity(source)}
+    running = jobs.submit("scan", snapshot)
+    assert started.wait(5)
+    queued = jobs.submit("scan", snapshot)
+    with source.open("ab") as handle:
+        handle.write(b"replacement")
+    jobs.cancel(running["id"])
+    assert terminal(jobs, queued["id"])["status"] == "failed"
+    assert "changed" in jobs.get(queued["id"])["error"]
+    # Submit with updated identity and exercise app shutdown cleanup.
+    last = jobs.submit("scan", snapshot | {"input_id": gui_jobs.identity(source)})
+    jobs.close()
+    assert jobs.get(last["id"])["status"] == "cancelled"
+    assert not jobs.work.exists()