browser_stylesheets_getTextEmpty.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Test that StyleSheetsActor.getText handles empty text correctly.

const CSS_CONTENT = "body { background-color: #f06; }";

const TEST_URI = `data:text/html;charset=utf-8,<style>${encodeURIComponent(

  CSS_CONTENT

)}</style>`;

add_task(async function () {

  const tab = await addTab(TEST_URI);

  const commands = await CommandsFactory.forTab(tab);

  await commands.targetCommand.startListening();

  const target = commands.targetCommand.targetFront;

  const styleSheetsFront = await target.getFront("stylesheets");

  ok(styleSheetsFront, "The StyleSheetsFront was created.");

  const sheets = [];

  await commands.resourceCommand.watchResources(

    [commands.resourceCommand.TYPES.STYLESHEET],

      onAvailable: resources => sheets.push(...resources),

);

  is(sheets.length, 1, "watchResources returned the correct number of sheets");

  const { resourceId } = sheets[0];

is(

    await getStyleSheetText(styleSheetsFront, resourceId),

    CSS_CONTENT,

    "The stylesheet has expected initial text"

);

  info("Update stylesheet content via the styleSheetsFront");

  await styleSheetsFront.update(resourceId, "", false);

is(

    await getStyleSheetText(styleSheetsFront, resourceId),

"",

    "Stylesheet is now empty, as expected"

);

  await commands.destroy();

});

async function getStyleSheetText(styleSheetsFront, resourceId) {

  const longStringFront = await styleSheetsFront.getText(resourceId);

  return longStringFront.string();