added integration tests

Author: DavertMik

.gitignore

@@ -59,3 +59,7 @@ typings/
 
 # next.js build output
 .next
+
+test/integration/node_modules
+test/integration/output
+

.travis.yml

@@ -1,5 +1,8 @@
 language: node_js
 node_js:
 - 12
+before_script:
+- cd test/integration && npm install
 script:
 - npm test
+- npm test-integration

README.md

@@ -15,11 +15,11 @@ Usage:
 const { setHeadlessWhen } = require('@codeceptjs/configure');
 
 // enable headless only if environment variable HEADLESS exist
+// Use it like:
+//
+// HEADLESS=true npx codeceptjs run
 setHeadlessWhen(process.env.HEADLESS); 
 
-// or enable headless on CI
-setHeadlessWhen(process.env.CI); 
-
 exports.config = {
   helpers: {
     // standard config goes here
@@ -67,6 +67,25 @@ exports.config = {
 
 ```
 
+### setWindowSize
+
+Universal way to set a browser window size. For Puppeteer this launches Chrome browser with a specified width and height dimensions without changing viewport size. 
+
+Usage: `setWindowSize(width, height)`.
+
+```js
+// in codecept.conf.js
+const { setWindowSize } = require('@codeceptjs/configure');
+
+setWindowSize(1600, 1200);
+
+exports.config = {
+  helpers: {
+    Puppeteer: {}
+  }
+}
+```
+
 ## Contributing
 
 Please send your config hooks!