public void number_of_collaborators()
{
var collaborators = db.NumberOfCollaborators();
Assert.IsTrue(collaborators.First(c => c.FirstName == "Andrew" && c.LastName == "Fuller").CollaboratorsCount == 5);
Assert.IsTrue(collaborators.First(c => c.FirstName == "Steven" && c.LastName == "Buchanan").CollaboratorsCount == 3);
}