chore: import upstream snapshot with attribution

packages/testing/src/setup/global.setup.ts

@@ -0,0 +1,74 @@
+/**
+ * Global setup utilities that run once before all tests.
+ *
+ * Use this for expensive setup that should only happen once.
+ */
+
+import { vi } from 'vitest'
+
+/**
+ * Suppresses specific console warnings/errors during tests.
+ */
+export function suppressConsoleWarnings(patterns: RegExp[]): void {
+  const originalWarn = console.warn
+  const originalError = console.error
+
+  console.warn = (...args: any[]) => {
+    const message = args.join(' ')
+    if (patterns.some((pattern) => pattern.test(message))) {
+      return
+    }
+    originalWarn.apply(console, args)
+  }
+
+  console.error = (...args: any[]) => {
+    const message = args.join(' ')
+    if (patterns.some((pattern) => pattern.test(message))) {
+      return
+    }
+    originalError.apply(console, args)
+  }
+}
+
+/**
+ * Common patterns to suppress in tests.
+ */
+export const COMMON_SUPPRESS_PATTERNS = [
+  /Zustand.*persist middleware/i,
+  /React does not recognize the.*prop/,
+  /Warning: Invalid DOM property/,
+  /act\(\) warning/,
+]
+
+/**
+ * Sets up global mocks for Node.js environment.
+ */
+export function setupNodeEnvironment(): void {
+  // Mock window if not present
+  if (typeof window === 'undefined') {
+    vi.stubGlobal('window', {
+      location: { href: 'http://localhost:3000' },
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+    })
+  }
+
+  // Mock document if not present
+  if (typeof document === 'undefined') {
+    vi.stubGlobal('document', {
+      createElement: vi.fn(() => ({
+        style: {},
+        setAttribute: vi.fn(),
+        appendChild: vi.fn(),
+      })),
+      body: { appendChild: vi.fn() },
+    })
+  }
+}
+
+/**
+ * Cleans up global mocks after tests.
+ */
+export function cleanupGlobalMocks(): void {
+  vi.unstubAllGlobals()
+}

packages/testing/src/setup/vitest.setup.ts

@@ -0,0 +1,40 @@
+/**
+ * Shared Vitest setup file for the testing package.
+ *
+ * Import this in your vitest.config.ts to get common mocks and setup.
+ *
+ * @example
+ * ```ts
+ * // vitest.config.ts
+ * export default defineConfig({
+ *   test: {
+ *     setupFiles: ['@sim/testing/setup'],
+ *   },
+ * })
+ * ```
+ */
+
+import { afterEach, beforeEach, vi } from 'vitest'
+import { setupGlobalFetchMock } from '../mocks/fetch.mock'
+import { createMockLogger } from '../mocks/logger.mock'
+import { clearStorageMocks, setupGlobalStorageMocks } from '../mocks/storage.mock'
+
+// Setup global storage mocks
+setupGlobalStorageMocks()
+
+// Setup global fetch mock with empty JSON response by default
+setupGlobalFetchMock({ json: {} })
+
+// Clear mocks between tests
+beforeEach(() => {
+  vi.clearAllMocks()
+})
+
+afterEach(() => {
+  clearStorageMocks()
+})
+
+// Export utilities for use in tests
+export { createMockLogger }
+export { setupGlobalStorageMocks, clearStorageMocks }
+export { mockFetchError, mockNextFetchResponse, setupGlobalFetchMock } from '../mocks/fetch.mock'