Commit LLM generated test cases

frontend/deterministic-tests/src/tests/create-merge-delete.test.ts

@@ -0,0 +1,52 @@
+import type { ClientState, TestDefinition } from "../test-definition";
+import { assert } from "../utils/assert";
+
+function verifyMergedContent(state: ClientState): void {
+    assert(state.files.size === 1, `Expected 1 file, got ${state.files.size}`);
+    assert(state.files.has("A.md"), "Expected A.md to exist");
+    const content = state.files.get("A.md") ?? "";
+    assert(
+        content.includes("from-zero") && content.includes("from-one"),
+        `Expected A.md to contain both "from-zero" and "from-one", got: "${content}"`
+    );
+}
+
+function verifyEmpty(state: ClientState): void {
+    assert(
+        state.files.size === 0,
+        `Expected 0 files after deletion, got ${state.files.size}: ${Array.from(state.files.keys()).join(", ")}`
+    );
+}
+
+export const createMergeDeleteTest: TestDefinition = {
+    name: "Concurrent Create, Merge, Then Delete",
+    description:
+        "Two clients simultaneously create A.md with different content. " +
+        "The server merges them and both converge. Then Client 0 deletes A.md. " +
+        "Both clients should converge on an empty state.",
+    clients: 2,
+    steps: [
+        // Both clients create A.md offline with different content
+        { type: "create", client: 0, path: "A.md", content: "from-zero" },
+        { type: "create", client: 1, path: "A.md", content: "from-one" },
+
+        // Enable sync — both creates race to the server
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Phase 1: verify merge happened correctly
+        { type: "assert-consistent", verify: verifyMergedContent },
+
+        // Phase 2: Client 0 deletes the merged file
+        { type: "delete", client: 0, path: "A.md" },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Both clients should have no files
+        { type: "assert-not-exists", client: 0, path: "A.md" },
+        { type: "assert-not-exists", client: 1, path: "A.md" },
+        { type: "assert-consistent", verify: verifyEmpty }
+    ]
+};