Commit LLM generated test cases

frontend/deterministic-tests/src/tests/rapid-create-update-delete-cycle.test.ts

@@ -0,0 +1,80 @@
+import type { ClientState, TestDefinition } from "../test-definition";
+import { assert } from "../utils/assert";
+
+/**
+ * EDGE CASE: Rapid create-update-delete cycle tests coalescing correctness.
+ *
+ * When events arrive faster than the queue can process them, coalescing
+ * determines the final action. This tests the full cycle:
+ *
+ * create + update = create (content read at sync time)
+ * create + delete = noop
+ *
+ * So a create-update-delete sequence should coalesce to noop and never
+ * reach the server at all.
+ *
+ * But then a new create follows:
+ * noop + create = create
+ *
+ * The final file should be synced correctly.
+ */
+function verifyFinalState(state: ClientState): void {
+    assert(
+        state.files.size === 1,
+        `Expected 1 file, got ${state.files.size}: ${Array.from(state.files.keys()).join(", ")}`
+    );
+    assert(state.files.has("cycle.md"), "Expected cycle.md to exist");
+    const content = state.files.get("cycle.md") ?? "";
+    assert(
+        content === "final creation",
+        `Expected "final creation", got: "${content}"`
+    );
+}
+
+export const rapidCreateUpdateDeleteCycleTest: TestDefinition = {
+    name: "Rapid Create-Update-Delete-Create Cycle",
+    description:
+        "Client 0 rapidly creates, updates, deletes, then re-creates a file. " +
+        "The event coalescing should correctly reduce this to a single create " +
+        "of the final content. Client 1 should see only the final file.",
+    clients: 2,
+    steps: [
+        { type: "enable-sync", client: 0 },
+        { type: "enable-sync", client: 1 },
+        { type: "sync" },
+        { type: "barrier" },
+
+        // Pause server so all operations coalesce before being processed
+        { type: "pause-server" },
+
+        // Rapid cycle: create → update → delete
+        {
+            type: "create",
+            client: 0,
+            path: "cycle.md",
+            content: "version 1"
+        },
+        {
+            type: "update",
+            client: 0,
+            path: "cycle.md",
+            content: "version 2"
+        },
+        { type: "delete", client: 0, path: "cycle.md" },
+
+        // Re-create with final content
+        {
+            type: "create",
+            client: 0,
+            path: "cycle.md",
+            content: "final creation"
+        },
+
+        // Resume server
+        { type: "resume-server" },
+        { type: "sync" },
+        { type: "barrier" },
+
+        { type: "assert-consistent", verify: verifyFinalState }
+    ]
+};