test(FN-4621): complete Step 5 — add worktrunk precedence integration test

Fusion-Task-Id: FN-4621
Fusion-Task-Lineage: fc1b0b13-9052-4378-86e3-3634d6c9db4e

packages/core/src/__tests__/settings-precedence.test.ts

@@ -0,0 +1,41 @@
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+
+import { createTaskStoreTestHarness } from "./store-test-helpers.js";
+
+describe("settings precedence", () => {
+  const harness = createTaskStoreTestHarness();
+
+  beforeEach(harness.beforeEach);
+  afterEach(harness.afterEach);
+
+  it("merges worktrunk field-level project overrides while preserving scope views", async () => {
+    await harness.store().updateGlobalSettings({
+      worktrunk: {
+        enabled: true,
+        binaryPath: "/opt/bin/worktrunk",
+        onFailure: "fallback-native",
+      },
+    });
+
+    await harness.store().updateSettings({
+      worktrunk: {
+        enabled: false,
+      },
+    });
+
+    const merged = await harness.store().getSettings();
+    expect(merged.worktrunk).toEqual({
+      enabled: false,
+      binaryPath: "/opt/bin/worktrunk",
+      onFailure: "fallback-native",
+    });
+
+    const scoped = await harness.store().getSettingsByScope();
+    expect(scoped.global.worktrunk).toEqual({
+      enabled: true,
+      binaryPath: "/opt/bin/worktrunk",
+      onFailure: "fallback-native",
+    });
+    expect(scoped.project.worktrunk).toEqual({ enabled: false });
+  });
+});