loop

frontend/deterministic-tests/src/tests/disable-sync-mid-create-no-duplicate.test.ts

@@ -0,0 +1,64 @@
+import type { AssertableState } from "../utils/assertable-state";
+import type { TestDefinition } from "../test-definition";
+
+export const disableSyncMidCreateNoDuplicateTest: TestDefinition = {
+    description:
+        "Client 0 creates `doc.md`. While the create's HTTP roundtrip is in " +
+        "flight (server paused), the user disables sync. Pre-fix: " +
+        "`SyncClient.pause()` calls `fetchController.startReset()`, which " +
+        "rejects the in-flight fetch with `SyncResetError`. The server " +
+        "still commits the document, but the client never learns the " +
+        "docId. The user then renames the file offline (`doc.md` -> " +
+        "`renamed.md`) and re-enables sync. The offline scan sees " +
+        "`renamed.md` as an untracked new file (the create's record was " +
+        "never settled) and creates a SECOND document on the server with " +
+        "the same content. WS catch-up then downloads the orphaned first " +
+        "doc back to `doc.md`, leaving the client with two files holding " +
+        "identical content. Post-fix: `pause({abortInFlight: false})` " +
+        "lets the create's HTTP land, the docId is captured into " +
+        "`queue.documents`, and the offline scan recognises `renamed.md` " +
+        "as a rename of an already-tracked doc — only one server doc " +
+        "exists.",
+    clients: 2,
+    steps: [
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+
+        // Pause the server so the upcoming create's HTTP buffers at the
+        // OS level. The fetch is in flight from the client's perspective
+        // — exactly the state where pre-fix `startReset` would discard
+        // its eventual response.
+        { type: "pause-server" },
+
+        { type: "create", client: 0, path: "doc.md", content: "marker\n" },
+
+        // Disable sync. Pre-fix: aborts the in-flight create with
+        // SyncResetError; the server commits but the client forgets.
+        // Post-fix: blocks until the in-flight HTTP lands; queue
+        // records the doc.
+        { type: "resume-server" },
+        { type: "disable-sync", client: 0 },
+
+        // User renames the file while offline.
+        { type: "rename", client: 0, oldPath: "doc.md", newPath: "renamed.md" },
+
+        // Re-enable sync. Post-fix: offline scan sees `renamed.md` as a
+        // rename of the tracked doc and PUTs a rename to the server.
+        // Pre-fix: scan sees `renamed.md` as new (queue.documents is
+        // empty for it) and CREATEs a second doc; WS catch-up later
+        // re-downloads the orphaned first doc to `doc.md`.
+        { type: "enable-sync", client: 0 },
+
+        { type: "barrier" },
+
+        {
+            type: "assert-consistent",
+            verify: (state: AssertableState): void => {
+                state.assertFileCount(1);
+                state.assertFileExists("renamed.md");
+                state.assertFileNotExists("doc.md");
+                state.assertContent("renamed.md", "marker\n");
+            }
+        }
+    ]
+};