async createFile(fileMetadata, media) {
    const file = await this.service.files.create({
      resource: fileMetadata,
      media,
      fields: 'id',
    });

    this.deleteFileOnCleanup(file.data.id);
    return file;
  }
Creates a test Drive file.
@param {string} fileMetadata The Drive file's metadata
@param {Media} media A media object
@return {Promise} A promise to return the Google API service.