Commit LLM generated test cases

frontend/deterministic-tests/src/tests/three-client-convergence.test.ts

@@ -0,0 +1,53 @@
+import type { ClientState, TestDefinition } from "../test-definition";
+import { assert } from "../utils/assert";
+
+function verifyAllContent(state: ClientState): void {
+    // All three creates at the same path should merge into a single file
+    assert(
+        state.files.size === 1,
+        `Expected 1 file after 3-way merge, got ${state.files.size}: ${Array.from(state.files.keys()).join(", ")}`
+    );
+    assert(
+        state.files.has("A.md"),
+        `Expected merged file at A.md, got: ${Array.from(state.files.keys()).join(", ")}`
+    );
+
+    const content = state.files.get("A.md") ?? "";
+    assert(
+        content.includes("from-zero"),
+        `Expected merged content to include "from-zero", got: "${content}"`
+    );
+    assert(
+        content.includes("from-one"),
+        `Expected merged content to include "from-one", got: "${content}"`
+    );
+    assert(
+        content.includes("from-two"),
+        `Expected merged content to include "from-two", got: "${content}"`
+    );
+}
+
+export const threeClientConvergenceTest: TestDefinition = {
+    name: "Three Client Convergence",
+    description:
+        "Three clients all create the same file offline with different content. " +
+        "When all three enable sync, the server must merge all three versions " +
+        "and all clients must converge to the same state with all content preserved.",
+    clients: 3,
+    steps: [
+        // All three 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" },
+        { type: "create", client: 2, path: "A.md", content: "from-two" },
+
+        // Enable sync on all three
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "enable-sync", client: 2 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // All three must converge and all content must be preserved
+        { type: "assert-consistent", verify: verifyAllContent }
+    ]
+};