#434

frontend/src/test/setup.ts

@@ -1,6 +1,10 @@
 import '@testing-library/jest-dom/vitest'
 import { cleanup } from '@testing-library/react'
-import { afterEach, vi } from 'vitest'
+import { afterEach, beforeEach, vi } from 'vitest'
+
+beforeEach (() => {
+  vi.spyOn (HTMLCanvasElement.prototype, 'getContext').mockReturnValue (null)
+})
 
 afterEach (() => {
   cleanup ()
@@ -16,10 +20,10 @@ window.scroll = function () {
   ;
 }
 
-window.requestAnimationFrame = callback => {
-  callback (0)
-  return 0
-}
+// Animation callbacks must advance time and must not recurse synchronously.
+window.requestAnimationFrame = callback => window.setTimeout (
+    () => callback (performance.now ()), 16)
+window.cancelAnimationFrame = identifier => window.clearTimeout (identifier)
 
 Object.defineProperty (window, 'matchMedia', {
     configurable: true,