School.Course.ToString C# (CSharp) Method

        public override string ToString()
        {
            StringBuilder output = new StringBuilder();
            output.Append(string.Format("Course name {0}; ", this.CourseName));

            for (int i = 0; i < this.Students.Count; i++)
            {
                output.Append(this.Students[i]);
            }

            return output.ToString();
        }
    }

        public void AddingStudent_CheckingIfHeExistInCourse()
        {
            var course = new Course("Course");
            var student = new Student("Petkan");
            course.AddStudent(student);

            var index = course.ToString().IndexOf(student.ToString());
            Assert.IsTrue(index >= 0);
        }