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jest-canvas-mock

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jest-canvas-mock

Mock a canvas in your jest tests.

  • 2.5.2
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What is jest-canvas-mock?

The jest-canvas-mock npm package is a mock for the HTML Canvas API, designed to be used with the Jest testing framework. It allows developers to write tests for canvas operations without the need for a browser environment. This is particularly useful for unit testing canvas-related code in Node.js environments or in continuous integration systems where a DOM may not be available.

What are jest-canvas-mock's main functionalities?

Mocking Canvas Context

This feature allows you to mock the 2D context of a canvas element, enabling you to test canvas drawing methods like fillRect.

import 'jest-canvas-mock';
test('mock canvas context', () => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  ctx.fillRect(0, 0, 100, 100);
  expect(ctx.fillRect).toHaveBeenCalledWith(0, 0, 100, 100);
});

Mocking Canvas Image Data

This feature allows you to mock the creation of image data, which is useful for testing image manipulation on the canvas.

import 'jest-canvas-mock';
test('mock canvas image data', () => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  const imageData = ctx.createImageData(100, 100);
  expect(imageData.data.length).toBe(40000);
});

Mocking Canvas Path Operations

This feature allows you to mock canvas path operations like beginPath, moveTo, lineTo, and stroke, which is useful for testing drawing paths on the canvas.

import 'jest-canvas-mock';
test('mock canvas path operations', () => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  ctx.beginPath();
  ctx.moveTo(50, 50);
  ctx.lineTo(100, 100);
  ctx.stroke();
  expect(ctx.beginPath).toHaveBeenCalled();
  expect(ctx.moveTo).toHaveBeenCalledWith(50, 50);
  expect(ctx.lineTo).toHaveBeenCalledWith(100, 100);
  expect(ctx.stroke).toHaveBeenCalled();
});

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Package last updated on 28 Jun 2023

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