pad.libre-service.eu-etherpad/tests/frontend/specs/pageupdownshort.js

'use strict';

describe('Page Up/Down Beginning and End position', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            '\n\n\n\nhello');
        cb();
      },
    });
  });

  it('scrolls to very end content on page down when viewport is at bottom', async function () {
    // this places the caret in the first line
    await helper.edit('Line 1', 1);

    const currentLineNumber = helper.caretLineNumber();
    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());

    // make sure caret is after hello
    const pos = helper.padInner$.document.getSelection();
    await helper.waitForPromise(() => pos.anchorOffset > 0);
  });

  // scrolls down 3 times - caret should be AFTER "hello
  it(`scrolls to very beginning content on pg up when
        viewport is at bottom of document`, async function () {
    // this places the caret in the first line
    await helper.edit('Line 1', 1);

    const currentLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber > helper.caretLineNumber());

    // make sure caret is at 0 position
    const pos = helper.padInner$.document.getSelection();
    await helper.waitForPromise(() => pos.anchorOffset === 0);
  });
});