Commit LLM generated test cases

frontend/deterministic-tests/src/tests/move-preserves-remote-update.test.ts

@@ -0,0 +1,59 @@
+import type { ClientState, TestDefinition } from "../test-definition";
+import { assert } from "../utils/assert";
+
+/**
+ * BUG FIX: Local rename must not drop a concurrent remote content update.
+ *
+ * Scenario:
+ * 1. Both clients have doc.md = "line 1\nline 2"
+ * 2. Client 0 renames doc.md to renamed.md
+ * 3. Client 1 edits doc.md content
+ * 4. Both sync
+ * 5. The file should exist (at some path) with both the rename and content update applied
+ */
+function verifyContentPreserved(state: ClientState): void {
+    assert(state.files.size === 1, `Expected 1 file, got ${state.files.size}`);
+    // The file should be at the renamed path
+    assert(
+        state.files.has("renamed.md") || state.files.has("doc.md"),
+        `Expected file at renamed.md or doc.md, got: ${Array.from(state.files.keys()).join(", ")}`
+    );
+    // Content from client 1's edit should be present
+    const [content] = [...state.files.values()];
+    assert(
+        content.includes("client 1 edit"),
+        `Expected merged content to include "client 1 edit", got: "${content}"`
+    );
+}
+
+export const movePreservesRemoteUpdateTest: TestDefinition = {
+    name: "Local Move Preserves Remote Content Update",
+    description:
+        "When a user renames a file and another client edits it concurrently, " +
+        "the content update should not be lost.",
+    clients: 2,
+    steps: [
+        // Setup
+        { type: "create", client: 0, path: "doc.md", content: "line 1\nline 2" },
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Both go offline
+        { type: "disable-sync", client: 0 },
+        { type: "disable-sync", client: 1 },
+
+        // Client 0 renames, client 1 edits content
+        { type: "rename", client: 0, oldPath: "doc.md", newPath: "renamed.md" },
+        { type: "update", client: 1, path: "doc.md", content: "line 1\nclient 1 edit\nline 2" },
+
+        // Both come online
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        { type: "assert-consistent", verify: verifyContentPreserved },
+    ],
+};