public async Task AssignUserToSchoolShouldAddTheUserToTheSchool()
{
var dbOptions = new DbContextOptionsBuilder <ApplicationDbContext>()
.UseInMemoryDatabase("test");
var context = new ApplicationDbContext(dbOptions.Options);
var schoolService = new SchoolService(context, null);
var school = new School();
var user = new ApplicationUser();
await context.Schools.AddAsync(school);
await context.Users.AddAsync(user);
await context.SaveChangesAsync();
await schoolService.AssignUserToSchool(user, school.Id);
var updatedUser = context.Users
.FirstOrDefault(x => x.Id == user.Id);
Assert.False(string.IsNullOrWhiteSpace(updatedUser.SchoolId));
}