perf($pytest): distribute tests across multiple CPUs to speed up test…

… execution

https://pypi.org/project/pytest-xdist/

.coveragerc

@@ -5,6 +5,7 @@
 data_file = ./build/.coverage
 source = python_boilerplate
 omit = python_boilerplate/__main__.py
+    python_boilerplate/__init__.py
     tests/*
 
 [report]

.pre-commit-config.yaml

@@ -38,7 +38,7 @@ repos:
     language: system
     # https://github.com/pytest-dev/pytest/issues/5502#issuecomment-1020761655
     # Prevent Pytest logging error like: ValueError: I/O operation on closed file.
-    entry: pipenv run pytest --cov --cov-report html --html=./build/.pytest_report/report.html --self-contained-html --log-cli-level=DEBUG
+    entry: pipenv run pytest --cov --cov-report html --html=./build/.pytest_report/report.html --self-contained-html --log-cli-level=DEBUG -n auto
     types: [python]
     pass_filenames: false
 

Pipfile

@@ -62,5 +62,7 @@ pytest-mock = "==3.8.2"
 pytest-cov = "==3.0.0"
 # Plugin for generating HTML reports for pytest results. https://github.com/pytest-dev/pytest-html/
 pytest-html = "==3.1.1"
+# pytest xdist plugin for distributed testing and loop-on-failing modes. https://github.com/pytest-dev/pytest-xdist/
+pytest-xdist = "==2.5.0"
 # Call stack profiler for Python. Shows you why your code is slow! https://github.com/joerick/pyinstrument
 pyinstrument = "==4.3.0"