feat: add build number env vars for compatibility with drone and othe…

…r CI systems

s updating readme

s updating readme

README.md

@@ -112,6 +112,18 @@ List of iOS simulators you can test on:
 - `device: 'iPhone 5', 'os_version': '6.0'`
 - `device: 'iPhone 5S', 'os_version': '7.0'`
 
+### CI/CD Build Environment Variables
+
+Many CI/CD systems will make the name or ID of the currently running build available via an environment variable. The follow environment variables below are supported by default:
+
+* `process.env.BUILD_NUMBER`
+* `process.env.BUILD_TAG`
+* `process.env.CI_BUILD_NUMBER`
+* `process.env.CI_BUILD_TAG`
+* `process.env.TRAVIS_BUILD_NUMBER`
+* `process.env.CIRCLE_BUILD_NUM`
+* `process.env.DRONE_BUILD_NUMBER`
+
 ---
 
 [BrowserStack's REST API documentation](https://www.browserstack.com/automate/rest-api#rest-api-browsers)

index.js

@@ -156,8 +156,14 @@ var BrowserStackBrowser = function (id, emitter, args, logger,
       timeout: bsConfig.timeout || 300,
       project: bsConfig.project,
       name: bsConfig.name || 'Karma test',
-      build: bsConfig.build || process.env.TRAVIS_BUILD_NUMBER || process.env.BUILD_NUMBER ||
-        process.env.BUILD_TAG || process.env.CIRCLE_BUILD_NUM || null
+      build: bsConfig.build ||
+        process.env.BUILD_NUMBER ||
+        process.env.BUILD_TAG ||
+        process.env.CI_BUILD_NUMBER ||
+        process.env.CI_BUILD_TAG ||
+        process.env.TRAVIS_BUILD_NUMBER ||
+        process.env.CIRCLE_BUILD_NUM ||
+        process.env.DRONE_BUILD_NUMBER || null
     }
 
     if (typeof args.real_mobile !== 'undefined') {