In the contributing guide, you are instructed to make an environment test_env:
# Create and activate the build environment
conda env create -f ci/requirements/py36.yml
conda activate test_env
# or with older versions of Anaconda:
source activate test_env
# Build and install xarray
pip install -e .
I think having the name be xarray_test_env would be clearer for people new to working with conda environments and using multiple projects.