async createTestBlob() {
    const file = await this.createFile(
        {
          name: 'photo.jpg',
        },
        {
          mimeType: 'image/jpeg',
          body: fs.createReadStream('files/photo.jpg'),
        },
    );

    return file;
  }
Uploads a test image to Google Drive.
@return {Promise} A promise to return the Google Drive file.