Add test for CoverTreeDTNNKMeans.
Add test for CoverTreeDTNNKMeans.


ersanliqiao/mlpack,theranger/mlpack,darcyliu/mlpack,datachand/mlpack,bmswgnp/mlpack,ranjan1990/mlpack,stereomatchingkiss/mlpack,darcyliu/mlpack,BookChan/mlpack,thirdwing/mlpack,palashahuja/mlpack,datachand/mlpack,ajjl/mlpack,stereomatchingkiss/mlpack,trungda/mlpack,chenmoshushi/mlpack,palashahuja/mlpack,ersanliqiao/mlpack,lezorich/mlpack,ajjl/mlpack,ranjan1990/mlpack,palashahuja/mlpack,thirdwing/mlpack,BookChan/mlpack,minhpqn/mlpack,ranjan1990/mlpack,Azizou/mlpack,BookChan/mlpack,erubboli/mlpack,lezorich/mlpack,ajjl/mlpack,bmswgnp/mlpack,darcyliu/mlpack,chenmoshushi/mlpack,erubboli/mlpack,minhpqn/mlpack,erubboli/mlpack,theranger/mlpack,thirdwing/mlpack,trungda/mlpack,chenmoshushi/mlpack,Azizou/mlpack,trungda/mlpack,minhpqn/mlpack,datachand/mlpack,lezorich/mlpack,theranger/mlpack,ersanliqiao/mlpack,bmswgnp/mlpack,stereomatchingkiss/mlpack,Azizou/mlpack