web-cad/frontend/tests/setup.ts

import '@testing-library/jest-dom';

// Mock Canvas 2D context for jsdom (jsdom doesn't implement CanvasRenderingContext2D)
const noop = () => {};
const mockCtx = {
  fillRect: noop,
  strokeRect: noop,
  clearRect: noop,
  beginPath: noop,
  closePath: noop,
  moveTo: noop,
  lineTo: noop,
  arc: noop,
  arcTo: noop,
  rect: noop,
  ellipse: noop,
  quadraticCurveTo: noop,
  bezierCurveTo: noop,
  fill: noop,
  stroke: noop,
  save: noop,
  restore: noop,
  scale: noop,
  translate: noop,
  rotate: noop,
  transform: noop,
  setTransform: noop,
  resetTransform: noop,
  setLineDash: noop,
  getLineDash: () => [] as number[],
  clip: noop,
  fillText: noop,
  strokeText: noop,
  measureText: () => ({ width: 0 }) as TextMetrics,
  drawImage: noop,
  createImageData: () => ({ width: 0, height: 0, data: new Uint8ClampedArray(0) }) as ImageData,
  getImageData: () => ({ width: 0, height: 0, data: new Uint8ClampedArray(0) }) as ImageData,
  putImageData: noop,
  createLinearGradient: () => ({ addColorStop: noop }) as CanvasGradient,
  createRadialGradient: () => ({ addColorStop: noop }) as CanvasGradient,
  createPattern: () => null as unknown as CanvasPattern,
  isPointInPath: () => false,
  isPointInStroke: () => false,
  // Properties
  canvas: null as unknown as HTMLCanvasElement,
  fillStyle: '',
  strokeStyle: '',
  lineWidth: 1,
  lineCap: 'butt' as CanvasLineCap,
  lineJoin: 'miter' as CanvasLineJoin,
  miterLimit: 10,
  lineDashOffset: 0,
  font: '10px sans-serif',
  textAlign: 'start' as CanvasTextAlign,
  textBaseline: 'alphabetic' as CanvasTextBaseline,
  direction: 'ltr' as CanvasTextDirection,
  globalAlpha: 1,
  globalCompositeOperation: 'source-over' as GlobalCompositeOperation,
  imageSmoothingEnabled: true,
  imageSmoothingQuality: 'low' as ImageSmoothingQuality,
  shadowBlur: 0,
  shadowColor: 'rgba(0, 0, 0, 0)',
  shadowOffsetX: 0,
  shadowOffsetY: 0,
  filter: 'none',
};

// Override getContext to return our mock for '2d'
HTMLCanvasElement.prototype.getContext = function (contextId: string) {
  if (contextId === '2d') {
    return mockCtx as unknown as CanvasRenderingContext2D;
  }
  return null;
} as typeof HTMLCanvasElement.prototype.getContext;

// Mock getBoundingClientRect for canvas elements
const origGetBoundingClientRect = HTMLElement.prototype.getBoundingClientRect;
HTMLElement.prototype.getBoundingClientRect = function () {
  if (this instanceof HTMLCanvasElement) {
    return {
      left: 0,
      top: 0,
      right: this.width,
      bottom: this.height,
      width: this.width,
      height: this.height,
      x: 0,
      y: 0,
      toJSON: () => ({}),
    } as DOMRect;
  }
  return origGetBoundingClientRect.call(this);
};