2d.text.measure.text-clusters-split.tentative.worker.js

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/text/2d.text.measure.text-clusters-split.tentative.worker.html - WPT Dashboard Interop Dashboard

// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.

// OffscreenCanvas test in a worker:2d.text.measure.text-clusters-split.tentative

// Description:Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together.

// Note:

importScripts("/resources/testharness.js");

importScripts("/html/canvas/resources/canvas-tests.js");

var t = async_test("Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together.");

var t_pass = t.done.bind(t);

var t_fail = t.step_func(function(reason) {

    throw reason;

});

t.step(function() {

  var canvas = new OffscreenCanvas(400, 200);

  var ctx = canvas.getContext('2d');

  ctx.font = '50px serif';

  const text = 'ABC ☺️❤️';

  ctx.fillText(text, 20, 100);

  const tm = ctx.measureText(text);

  const clusters = tm.getTextClusters();

  // Should return 6 clusters(A|B|C| |☺️|❤️).

  _assertSame(clusters.length, 6, "clusters.length", "6");

  // A from position 0 to 1.

  _assertSame(clusters[0].begin, 0, "clusters[\""+(0)+"\"].begin", "0");

  _assertSame(clusters[0].end, 1, "clusters[\""+(0)+"\"].end", "1");

  // B from position 1 to 2.

  _assertSame(clusters[1].begin, 1, "clusters[\""+(1)+"\"].begin", "1");

  _assertSame(clusters[1].end, 2, "clusters[\""+(1)+"\"].end", "2");

  // C from position 2 to 3.

  _assertSame(clusters[2].begin, 2, "clusters[\""+(2)+"\"].begin", "2");

  _assertSame(clusters[2].end, 3, "clusters[\""+(2)+"\"].end", "3");

  // space from position 3 to 4.

  _assertSame(clusters[3].begin, 3, "clusters[\""+(3)+"\"].begin", "3");

  _assertSame(clusters[3].end, 4, "clusters[\""+(3)+"\"].end", "4");

  // ☺️ from position 4 to 6.

  _assertSame(clusters[4].begin, 4, "clusters[\""+(4)+"\"].begin", "4");

  _assertSame(clusters[4].end, 6, "clusters[\""+(4)+"\"].end", "6");

  // ❤️ from position 6 to 8.

  _assertSame(clusters[5].begin, 6, "clusters[\""+(5)+"\"].begin", "6");

  _assertSame(clusters[5].end, 8, "clusters[\""+(5)+"\"].end", "8");

  t.done();

});

done();