Function visualTest

test/unit/visual/visualTest.js:380–487

(
  testName,
  callback,
  { focus = false, skip = false, timeout } = {}
)

 * key `focus` to true to only run this test, or its `skip` key to skip it.
 */
export function visualTest(
  testName,
  callback,
  { focus = false, skip = false, timeout } = {}
) {
  let suiteFn = describe;
  if (focus) {
    suiteFn = suiteFn.only;
  }
  if (skip) {
    suiteFn = suiteFn.skip;
  }

  suiteFn(testName, function() {
    let name;
    let myp5;
    let lastDeviceRatio = window.devicePixelRatio;

    beforeAll(function() {
      name = namePrefix + escapeName(testName);
      // Force everything to be 1x
      window.devicePixelRatio = 1;
      return new Promise(res => {
        myp5 = new p5(function(p) {
          p.setup = function() {
            res();
          };
        });
      });
    });

    afterAll(function() {
      window.devicePixelRatio = lastDeviceRatio;
      myp5.remove();
    });

    test('matches expected screenshots', async function() {
      let expectedScreenshots;
      try {
        const metadata = JSON.parse(await readFile(
          `./test/unit/visual/screenshots/${name}/metadata.json`
        ));
        expectedScreenshots = metadata.numScreenshots;
      } catch (e) {
        console.log(e);
        expectedScreenshots = 0;
      }

      const actual = [];

      // Generate screenshots
      await callback(myp5, async () => {
        const img = await myp5.get();
        img.pixelDensity(1);
        actual.push(img);
      });