FileSystemObserver-writable-file-stream.js

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'use strict';

// This script depends on the following scripts:

//    resources/test-helpers.js

//    resources/collecting-file-system-observer.js

//    script-tests/FileSystemObserver-writable-file-stream.js

directory_test(async (t, root_dir) => {

  const file = await root_dir.getFileHandle(getUniqueName(), {create: true});

  const observer = new CollectingFileSystemObserver(t, root_dir);

  await observer.observe([file]);

  // Write to `file` through a `FileSystemWritableFileStream`.

  const writable = await createWFSWithCleanup(t, file);

  await writable.write('contents');

  await writable.close();

  // Expect one "modified" event to happen on `file`.

  const records = await observer.getRecords();

  await assert_records_equal(file, records, [modifiedEvent(file, [])]);

}, 'Closing a FileSystemWritableFileStream that\'s modified the file produces a "modified" event');

directory_test(async (t, root_dir) => {

  const file = await root_dir.getFileHandle(getUniqueName(), {create: true});

  const observer = new CollectingFileSystemObserver(t, root_dir);

  await observer.observe([file]);

  // Write to `file`.

  const writable = await createWFSWithCleanup(t, file);

  await writable.write('contents');

  await writable.truncate(1);

  await writable.seek(1);

    // Expect no events to happen.

    const records = await observer.getRecords();

    await assert_records_equal(file, records, []);

  await writable.abort();

    // Expect no events to happen.

    const records = await observer.getRecords();

    await assert_records_equal(file, records, []);

}, 'All FileSystemWritableFileStream methods that aren\'t closed don\'t produce events');