ui/vitest.setup.ts

// Copyright (C) 2026 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Global setup for Vitest, referenced from vitest.config.mjs (setupFiles).
//
// jsdom does not implement ResizeObserver, which some widgets construct on mount
// (e.g. grid virtualization, virtual canvas). Provide a no-op stub: there is no
// real layout in the test DOM, so the callback would never fire meaningfully
// anyway.
if (typeof globalThis.ResizeObserver === 'undefined') {
  globalThis.ResizeObserver = class {
    observe() {}
    unobserve() {}
    disconnect() {}
  } as unknown as typeof ResizeObserver;
}