test_drag_image_file.html

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<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <title>Test that dragging an image produces a File</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/EventUtils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<img id="green-png" src="green.png">

<script>

async function runTest() {

  await SpecialPowers.pushPrefEnv({

    set: [["dom.events.dataTransfer.imageAsFile.enabled", true]],

});

  let dt = await synthesizePlainDragAndCancel({

      srcElement: document.getElementById('green-png'),

      finalY: 20,

  }, null);

  info(`DataTransfer types: ${dt.types}`);

  for (let type of dt.types) {

    info(`getData(${type}) = ${dt.getData(type)}`)

  ok(dt.types.includes("Files"), "types should contains 'Files'");

  is(dt.files.length, 1, "files contains one File");

  let fileItem = null;

  for (let item of dt.items) {

    if (item.kind === "file") {

      fileItem = item;

      break;

  is(fileItem.kind, "file", "Is a file");

  is(fileItem.type, "image/png", "Is a PNG file");

  let file = fileItem.getAsFile();

  is(file.name, "image.png", "Has generic image name")

  ok(file.size > 100, "Is not empty");

  SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

SimpleTest.waitForFocus(runTest);

</script>

</body>

</html>