gistfile1.txt

- (void) testRelationshipTodoUser
{
//  Create user and todo
    
    User *user = [NSEntityDescription insertNewObjectForEntityForName:@"User" inManagedObjectContext:self.moc];
    [user setEmail:@"[email protected]"];
    
    Todo *todo = [NSEntityDescription insertNewObjectForEntityForName:@"Todo" inManagedObjectContext:self.moc];
    [todo setAction:@"first"];
    [todo setUser:user];
    
    NSError *error = nil;
    BOOL result = [self.moc save:&error];
    
    XCTAssertNil(error, @"save should not raise errors");
    XCTAssertTrue(result, @"save should be true");

//  Fetch todo and get user
    
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *todoEntity = [NSEntityDescription entityForName:@"Todo" inManagedObjectContext:self.moc];
    [fetchRequest setEntity:todoEntity];
    NSArray *fetchedObjects = [self.moc executeFetchRequest:fetchRequest error:&error];
    
    NSObject *fetchedTodo = [fetchedObjects firstObject];
    NSObject *fetchedUser = [fetchedTodo valueForKey:@"user"];
    NSString *email = [fetchedUser valueForKey:@"email"];

//  Check that email is the same as set value
    
    XCTAssert([email isEqualToString:@"[email protected]"], @"user should have email");
}