#434

frontend/src/pages/CountsResourcePage.test.tsx

@@ -26,6 +26,7 @@ const renderPage = (extra = '') => renderWithProviders (<>
 </>, { route: `/ja/counts/posts?mode=details&timezone=UTC${extra}` })
 
 beforeEach (() => {
+  vi.spyOn (HTMLCanvasElement.prototype, 'getContext').mockReturnValue (null)
   fetchCounts.mockReset ().mockResolvedValue (detailResult)
   fetchCountsDefinition.mockReset ().mockResolvedValue (postDefinition)
 })