behat: Use dmarynicz/behat-parallel-extension to run tests in parallel when BEHAT_PARALLEL is set

Author: dkoston

behat.yml

@@ -5,3 +5,5 @@ default:
         - WP_CLI\Tests\Context\FeatureContext
       paths:
         - features
+  extensions:
+    DMarynicz\BehatParallelExtension\Extension: ~

bin/run-behat-tests

@@ -19,6 +19,12 @@ if [[ "$@" == *"--help"* ]]; then
     exit $ret
 fi
 
+PARALLEL=""
+if [[ -n "${BEHAT_PARALLEL}" ]]; then
+    PARALLEL="--parallel"
+fi
+
+
 # Turn WP_VERSION into an actual number to make sure our tags work correctly.
 if [ "${WP_VERSION-latest}" = "latest" ]; then
 	export WP_VERSION=$(curl -s https://api.wordpress.org/core/version-check/1.7/ | jq -r ".offers[0].current")
@@ -45,4 +51,4 @@ export WP_CLI_TESTS_ROOT
 BEHAT_TAGS=$(php "$WP_CLI_TESTS_ROOT"/utils/behat-tags.php)
 
 # Run the functional tests.
-vendor/bin/behat --format progress "$BEHAT_TAGS" --strict "$@"
+vendor/bin/behat "${PARALLEL}" --format progress "$BEHAT_TAGS" --strict "$@"

composer.json

@@ -12,6 +12,7 @@
         "php": ">=5.6",
         "behat/behat": "^3.7",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.4.3 || ^0.5 || ^0.6.2 || ^0.7.1 || ^1.0.0",
+        "dmarynicz/behat-parallel-extension": "^1.0",
         "php-parallel-lint/php-console-highlighter": "^1.0",
         "php-parallel-lint/php-parallel-lint": "^1.3.1",
         "phpcompatibility/php-compatibility": "dev-develop",