Run tests in parallel with pytest-xdist.

.circleci/ci-oldest-reqs.txt

@@ -8,6 +8,7 @@ packaging==15.0
 pandas==1.0.0
 pymongo==3.0.0
 pytest-cov==2.10.1
+pytest-xdist==2.5.0
 pytest==6.2.1
 tables==3.4.2
 tqdm==4.10.0

.circleci/config.yml

@@ -75,7 +75,7 @@ jobs:
           name: Run tests
           command: |
             . venv/bin/activate
-            ${PYTHON} -m pytest --cov signac --cov-config=setup.cfg --cov-report=xml tests/ -v
+            ${PYTHON} -m pytest -n 2 --dist loadfile --cov=signac --cov-config=setup.cfg --cov-report=xml tests/ -v
             codecov
 
       - store_artifacts:
@@ -171,7 +171,7 @@ jobs:
       - run:
           name: Run tests
           command: |
-            ${PYTHON} -m pytest --cov=signac --cov-report=xml tests/ -v
+            ${PYTHON} -m pytest -n 2 --dist loadfile --cov=signac --cov-report=xml tests/ -v
             codecov
 
   macos-python-3:
@@ -195,7 +195,7 @@ jobs:
             python -m pip install --progress-bar off -U -r requirements/requirements-test.txt
             python -m pip install --progress-bar off -U -r requirements/requirements-test-optional.txt
             python -m pip install --progress-bar off -U -e .
-            python -m pytest --cov=signac --cov-report=xml tests/ -v
+            python -m pytest -n 2 --dist loadfile --cov=signac --cov-report=xml tests/ -v
             codecov
 
   check-metadata:

changelog.txt

@@ -15,6 +15,7 @@ Added
 
  - Official support for Python 3.10 (#631).
  - Benchmarks can be run using the ``asv`` (airspeed velocity) tool (#629).
+ - Continuous integration tests run in parallel with ``pytest-xdist`` (#705).
 
 Changed
 +++++++

requirements/requirements-test.txt

@@ -1,3 +1,4 @@
 coverage==6.3.2
 pytest==7.0.1
 pytest-cov==3.0.0
+pytest-xdist==2.5.0