public async Task Success_Accept_Pending_Friend_Invitation()
{
await _relationService.RelationInviteAsync(SenderId, TargetId, CharacterRelationType.Friend);
IEnumerable <RelationInvitationDto> invitations = await _relationService.GetPendingInvitationByCharacterIdAsync(TargetId);
Assert.IsNotNull(invitations);
RelationInvitationDto invitation = invitations.FirstOrDefault(s => s.OwnerId == SenderId);
Assert.IsNotNull(invitation);
// accept the invitation
List <RelationDto> relation = await _relationService.RelationInviteProcessAsync(invitation.Id, RelationInvitationProcessType.Accept);
IEnumerable <RelationDto> relations = await _relationService.GetRelationListByCharacterIdAsync(SenderId);
Assert.IsTrue(relations.Any(s => s.OwnerId == SenderId && s.TargetId == TargetId && s.Type == CharacterRelationType.Friend && relation.Any(c => c.Id == s.Id)));
// invitations should be clear
IEnumerable <RelationInvitationDto> invitationsEmpty = await _relationService.GetPendingInvitationByCharacterIdAsync(TargetId);
Assert.IsTrue(!invitationsEmpty.Any());
await _relationService.RelationRemoveAsync(relations);
}