chore: Use pytest-xdist (#1018)

.coveragerc

@@ -3,6 +3,5 @@ branch = True
 source = falcon
 omit = falcon/tests*,falcon/cmd*,falcon/bench*
 
-
 [report]
 show_missing = True

tests/test_wsgi.py

@@ -1,3 +1,4 @@
+import os
 import sys
 import time
 from wsgiref.simple_server import make_server
@@ -15,7 +16,7 @@ from falcon.request_helpers import BoundedStream
 import falcon.testing as testing
 
 _SERVER_HOST = 'localhost'
-_SERVER_PORT = 9809
+_SERVER_PORT = 9800 + os.getpid() % 100  # Facilitates parallel test execution
 _SERVER_BASE_URL = 'http://{0}:{1}/'.format(_SERVER_HOST, _SERVER_PORT)
 _SIZE_1_KB = 1024
 

tools/test-requires

@@ -1,6 +1,8 @@
 coverage>=4.1
 ddt
 pytest>=3.0.1
+pytest-cov
+pytest-xdist
 pyyaml
 requests
 six

tox.ini

@@ -27,7 +27,7 @@ commands = {toxinidir}/tools/clean.sh {toxinidir}/falcon
 whitelist_externals = mkdir
                       mv
 commands = {toxinidir}/tools/clean.sh {toxinidir}/falcon
-           coverage run -m pytest tests []
+           pytest -n 4 --cov=falcon tests []
            mkdir -p .coverage_data
            mv {toxinidir}/.coverage {toxinidir}/.coverage_data/.coverage.{envname}
 

travis_scripts/install.sh

@@ -7,6 +7,9 @@ if [ "$JYTHON" = "true" ]; then
     # bug: http://bugs.jython.org/issue527524).
     $HOME/jython/bin/pip install https://github.com/kennethreitz/requests/archive/v2.11.0.zip
     $HOME/jython/bin/pip install -r tools/test-requires
+
+    # python-xdist is not compatible with Jython
+    $HOME/jython/bin/pip uninstall -y pytest-xdist
 else
     pip install tox coveralls
 fi