public void AddRelationToNode()
{
// Arrange
var relationRequest = new NodeRelationRequest()
{
NodeId = 1,
ChildrenId = 2
};
// Act
_target.AddRelationToNode(relationRequest);
// Assert
A.CallTo(() => _nodeService.AddChildren(1, A <int> ._)).MustHaveHappened(Repeated.Exactly.Once);
A.CallTo(() => _nodeService.LinkAnswerToNode(3, 2)).MustNotHaveHappened();
}