public void Delete_GivenOneStudentInFile_ShouldReturnAnEmptyList() { var json = "[{ \"Id\":\"1\", \"Name\":\"Pepe\", \"LastName\":\"Perez\", \"Age\": 20}]"; File.WriteAllText(FileName, json); var student = new Student { Id = 1 }; var jsonStudentDao = new JsonStudentDao(); jsonStudentDao.Delete(student); var jsonList = jsonStudentDao.GetAll(); Assert.AreEqual(0, jsonList.Count); }