epub2pdf: title-based export names, .pdf download headers, security hardening (68 tests green)

tests/test_job_registry.py

@@ -0,0 +1,47 @@
+"""Job registry behavior: registration shape and the 50-entry eviction cap.
+
+Unit-level tests against app._register_job — the registry is module-global
+state that every API test isolates via the autouse fixture.
+"""
+import time
+
+import app
+
+
+def test_register_job_shape():
+    job_id = app._register_job("x.epub")
+    assert job_id in app.JOBS
+    job = app.JOBS[job_id]
+    assert job["id"] == job_id
+    assert job["epub"] == "x.epub"
+    assert job["status"] == "queued"
+    assert job["progress"] == 0.0
+    assert job["message"] == "queued"
+    assert job["filename"] is None
+    assert job["error"] is None
+    assert job["created"] > 0
+
+
+def test_job_ids_are_unique():
+    a = app._register_job("a.epub")
+    b = app._register_job("b.epub")
+    assert a != b
+
+
+def test_registry_evicts_oldest_beyond_50():
+    now = time.time()
+    old_ids = []
+    for i in range(50):
+        jid = app._register_job(f"old{i}.epub")
+        old_ids.append(jid)
+        # Force ascending 'created' so eviction order is deterministic.
+        app.JOBS[jid]["created"] = now - (1000 - i)
+    oldest = old_ids[0]
+    newest_old = old_ids[-1]
+
+    new_id = app._register_job("new.epub")
+
+    assert len(app.JOBS) == 50
+    assert oldest not in app.JOBS, "oldest job must be evicted"
+    assert newest_old in app.JOBS
+    assert new_id in app.JOBS