Commit LLM generated test cases

frontend/deterministic-tests/src/tests/create-rename-response-skips-file.test.ts

@@ -0,0 +1,67 @@
+import type { ClientState, TestDefinition } from "../test-definition";
+import { assert } from "../utils/assert";
+
+/**
+ * Regression guard for the create+rename race from e2e log_4.log.
+ *
+ * In the e2e test, timing jitter caused the HTTP response to arrive
+ * between the create and rename being coalesced by the sync queue,
+ * orphaning the document. This is documented in CLAUDE.md as a known
+ * limitation of concurrent creates at the same path.
+ *
+ * The deterministic test framework serializes steps, so the event
+ * coalescing correctly handles the create+rename sequence here.
+ * This test serves as a regression guard — if the coalescing logic
+ * changes, this test will catch regressions.
+ */
+function verifyBothClientsHaveContent(state: ClientState): void {
+    assert(
+        state.files.size === 1,
+        `Expected exactly 1 file, got ${state.files.size}: ${Array.from(state.files.keys()).join(", ")}`
+    );
+    const [content] = Array.from(state.files.values());
+    assert(
+        content === "the-content",
+        `Expected file to have "the-content", got: "${content}"`
+    );
+}
+
+export const createRenameResponseSkipsFileTest: TestDefinition = {
+    name: "Create Then Immediate Rename — File Not Lost",
+    description:
+        "Client creates a file online then immediately renames it. " +
+        "The create response arrives at the original path. " +
+        "The other client must receive the file content.",
+    clients: 2,
+    steps: [
+        // Both clients online
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Client 0 creates doc.md while online (HTTP request fires immediately)
+        {
+            type: "create",
+            client: 0,
+            path: "doc.md",
+            content: "the-content"
+        },
+
+        // Immediately rename — the create request is already in-flight
+        {
+            type: "rename",
+            client: 0,
+            oldPath: "doc.md",
+            newPath: "renamed.md"
+        },
+
+        // Let everything sync
+        { type: "sync" },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Both clients must have the content (at whatever path)
+        { type: "assert-consistent", verify: verifyBothClientsHaveContent }
+    ]
+};