It would be nice to have a separate path variable like:
```
path_to_build_dir = '/path/to/cpp/build'
env.param('CPP_GTEST', {
    ANOMALY: path_to_build_dir + '/anomaly_test',
    CLASSIFIER : path_to_build_dir + '/classifier_test',
    CLUSTERING: path_to_build_dir + '/clustering_test',
    GRAPH: path_to_build_dir + '/graph_test',
    RECOMMENDER: path_to_build_dir + '/recommender_test',
    REGRESSION: path_to_build_dir + '/regression_test',
    NEAREST_NEIGHBOR: path_to_build_dir + '/nearest_neighbor_test',
    STAT: path_to_build_dir + '/stat_test',
})
```
so that we can easily copy & paste.