frontend/src/test/setup.ts

import "@testing-library/jest-dom/vitest";
import { cleanup } from "@testing-library/react";
import { afterEach, vi } from "vitest";

function createCanvasContext() {
  return {
    scale: vi.fn(),
    clearRect: vi.fn(),
    fillRect: vi.fn(),
    strokeRect: vi.fn(),
    beginPath: vi.fn(),
    closePath: vi.fn(),
    moveTo: vi.fn(),
    lineTo: vi.fn(),
    stroke: vi.fn(),
    fill: vi.fn(),
    arc: vi.fn(),
    rect: vi.fn(),
    drawImage: vi.fn(),
    createLinearGradient: vi.fn(() => ({ addColorStop: vi.fn() })),
    getImageData: vi.fn(() => ({ data: new Uint8ClampedArray(0) })),
    putImageData: vi.fn(),
    measureText: vi.fn(() => ({ width: 0 })),
    save: vi.fn(),
    restore: vi.fn(),
    setLineDash: vi.fn(),
    translate: vi.fn(),
    rotate: vi.fn(),
    resetTransform: vi.fn(),
    setTransform: vi.fn(),
    lineWidth: 1,
    lineCap: "round",
    lineJoin: "round",
    strokeStyle: "#111827",
    fillStyle: "#ffffff",
    canvas: null as HTMLCanvasElement | null,
  };
}

if (typeof HTMLCanvasElement !== "undefined") {
  Object.defineProperty(HTMLCanvasElement.prototype, "getContext", {
    configurable: true,
    value: vi.fn(function getContext(this: HTMLCanvasElement) {
      const ctx = createCanvasContext();
      ctx.canvas = this;
      return ctx;
    }),
  });

  Object.defineProperty(HTMLCanvasElement.prototype, "toDataURL", {
    configurable: true,
    value: vi.fn(() => "data:image/png;base64,"),
  });
}

afterEach(() => {
  cleanup();
});