After installing jest

package.json

{
  "name": "testing-canvas-with-jest",
  "version": "1.0.0",
  "description": "Showing how to test canvas with jest",
  "main": "index.js",
  "scripts": {
    "test": "jest"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/YonatanKra/testing-canvas-with-jest.git"
  },
  "keywords": [
    "jest",
    "canvas",
    "javascript"
  ],
  "author": "YonatanKra <kra.yonatan@gmail.com>",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/YonatanKra/testing-canvas-with-jest/issues"
  },
  "homepage": "https://github.com/YonatanKra/testing-canvas-with-jest#readme",
  "devDependencies": {
    "jest": "^27.0.6"
  }
}