added benchmark test command

.travis.yml

@@ -6,6 +6,7 @@ install:
   - npm ci
 script:
   - npm run lint
+  - npm run benchmark
   - npm run test
   - npm run build
   - npm run build-demo

package.json

@@ -50,6 +50,7 @@
     "lint": "eslint 'src/**/*.js' 'demo/src/**/*.js' 'examples/*.js' 'webpack.*.js'",
     "doc": "yuidoc --config yuidoc.json --project-version $npm_package_version",
     "doc-watch": "nodemon --delay 3 --watch 'matter-doc-theme' --watch src -e 'js,html,css,handlebars' --exec 'npm run doc'",
+    "benchmark": "EXAMPLES=stress3 npm run test-node",
     "test": "npm run test-node",
     "test-all": "jest --no-cache",
     "test-save": "SAVE=true npm run test-node",

test/Examples.spec.js

@@ -18,12 +18,14 @@ const MatterBuild = requireUncached('../build/matter');
 const { versionSatisfies } = requireUncached('../src/core/Plugin');
 const Worker = require('jest-worker').default;
 
+const specificExamples = process.env.EXAMPLES ? process.env.EXAMPLES.split(' ') : null;
 const testComparison = process.env.COMPARE === 'true';
 const saveComparison = process.env.SAVE === 'true';
+
 const excludeExamples = ['svg', 'terrain'];
 const excludeJitter = ['stack', 'circleStack', 'restitution', 'staticFriction', 'friction', 'newtonsCradle', 'catapult'];
 
-const examples = Object.keys(Example).filter(key => {
+const examples = (specificExamples || Object.keys(Example)).filter(key => {
     const excluded = excludeExamples.includes(key);
     const buildVersion = MatterBuild.version;
     const exampleFor = Example[key].for;