public void DeletePost_deletePostOnceWithCorrectParamValue() { //Arange var postBo = new PostsBo(_postsRepo, _postRatigVotesRepo, _avatarImgRepo); const int postId = 1; //Act postBo.DeletePost(postId); //Assert _postsRepo .Received(1).Delete(Arg.Is<int>(x => x == postId)); }