public void EmployeeWithPictureIsAdded()
{
byte[] picture = new byte[0];
Guid id = Guid.NewGuid();
ObjectId pictureId = new ObjectId();
binaryFiles.UploadFromBytes(id.ToString(), picture).Returns(pictureId);
sut.AddEmployee(id, "LeBlanc", "Matt", "comedian", "Madrid", "bosses", string.Empty, picture);
employees.Received(1).InsertOne(Arg.Is<Employee>(e => e.PictureFileId.Equals(pictureId)));
}