Commit LLM generated test cases

frontend/deterministic-tests/src/tests/idempotency-after-server-pause.test.ts

@@ -0,0 +1,55 @@
+import type { ClientState, TestDefinition } from "../test-definition";
+import { assert } from "../utils/assert";
+
+function verifyNoDuplicates(state: ClientState): void {
+    assert(
+        state.files.size === 1,
+        `Expected exactly 1 file, got ${state.files.size}: ${Array.from(state.files.keys()).join(", ")}`
+    );
+    assert(
+        state.files.has("doc.md"),
+        `Expected doc.md to exist, got: ${Array.from(state.files.keys()).join(", ")}`
+    );
+    const content = state.files.get("doc.md") ?? "";
+    assert(
+        content === "important data",
+        `Expected doc.md content to be "important data", got: "${content}"`
+    );
+}
+
+export const idempotencyAfterServerPauseTest: TestDefinition = {
+    name: "Idempotency Key Prevents Duplicates After Server Pause",
+    description:
+        "Client 0 creates a file. The server is paused mid-response (SIGSTOP), " +
+        "so the client's HTTP request stalls. When the server resumes, the " +
+        "idempotency key should prevent duplicate documents from being created. " +
+        "Both clients must converge to a single copy of the file.",
+    clients: 2,
+    steps: [
+        // Both clients online
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Client 0 creates a file, then immediately pause the server so the
+        // response is stalled (the server may or may not have committed the
+        // create — either way the idempotency key protects us).
+        { type: "create", client: 0, path: "doc.md", content: "important data" },
+        { type: "pause-server" },
+
+        // Wait with server frozen — client's in-flight create request is stuck.
+
+        // Resume the server. The stalled request completes (or the client
+        // retries with the same idempotency key).
+        { type: "resume-server" },
+
+        // Sync and converge
+        { type: "sync" },
+        { type: "barrier" },
+
+        // There must be exactly one doc.md with the correct content — no
+        // duplicates like "doc (1).md".
+        { type: "assert-consistent", verify: verifyNoDuplicates }
+    ]
+};