public void GetSubjectByIdTest()
{
var expectedSubject = subjectManager.GetSubjects().LastOrDefault();
var actualSubject = subjectManager.GetSubjectByID(expectedSubject.Id);
Assert.IsNotNull(actualSubject, "Subject is null");
Assert.AreEqual(expectedSubject.Id, actualSubject.Id, "DB return different id");
Assert.AreEqual(expectedSubject.Name, actualSubject.Name, "DB return different subject name");
Assert.IsInstanceOfType(actualSubject, typeof(Subject), "Object type is wrong!");
Assert.IsInstanceOfType(actualSubject.Id, typeof(int), "Id is not int");
Assert.IsInstanceOfType(actualSubject.Name, typeof(string), "Subject name is not string");
}