tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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browser_fontinspector_editor-letter-spacing-conversion.js (1896B)

      1 /* Any copyright is dedicated to the Public Domain.
      2   http://creativecommons.org/publicdomain/zero/1.0/ */
      3 /* global getPropertyValue */
      4 
      5 "use strict";
      6 
      7 // Unit test for math behind conversion of units for letter-spacing.
      8 
      9 const TEST_URI = `
     10  <style type='text/css'>
     11    body {
     12      /* Set root font-size to equivalent of 32px (2*16px) */
     13      font-size: 200%;
     14    }
     15    div {
     16      letter-spacing: 1em;
     17    }
     18  </style>
     19  <div>LETTER SPACING</div>
     20 `;
     21 
     22 add_task(async function () {
     23  const URI = "data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI);
     24  const { inspector, view } = await openFontInspectorForURL(URI);
     25  const viewDoc = view.document;
     26  const property = "letter-spacing";
     27  const UNITS = {
     28    px: 32,
     29    pt: 24,
     30    rem: 2,
     31    em: 1,
     32  };
     33 
     34  await selectNode("div", inspector);
     35 
     36  info("Check that font editor shows letter-spacing value in original units");
     37  const letterSpacing = getPropertyValue(viewDoc, property);
     38  is(
     39    letterSpacing.value + letterSpacing.unit,
     40    "1em",
     41    "Original letter spacing is 1em"
     42  );
     43 
     44  // Starting value and unit for conversion.
     45  let prevValue = letterSpacing.value;
     46  let prevUnit = letterSpacing.unit;
     47 
     48  for (const unit in UNITS) {
     49    const value = UNITS[unit];
     50 
     51    info(`Convert letter-spacing from ${prevValue}${prevUnit} to ${unit}`);
     52    const convertedValue = await view.convertUnits(
     53      property,
     54      prevValue,
     55      prevUnit,
     56      unit
     57    );
     58    is(
     59      convertedValue,
     60      value,
     61      `Converting to ${unit} returns transformed value.`
     62    );
     63 
     64    // Store current unit and value to use in conversion on the next iteration.
     65    prevUnit = unit;
     66    prevValue = value;
     67  }
     68 
     69  info(`Check that conversion to fake unit returns 1-to-1 mapping`);
     70  const valueToFakeUnit = await view.convertUnits(property, 1, "px", "fake");
     71  is(valueToFakeUnit, 1, `Converting to fake unit returns same value.`);
     72 });