Add a .chromeDataDir option to help debugging tests

Author: dennis-johnson-dev

README.md

@@ -40,6 +40,16 @@ You can change this to any minimatch pattern _(note the quotes to avoid shell ex
 karmatic '**/*Spec.jsx?'
 ```
 
+### Options
+
+`--chromeDataDir <filename>`
+
+Filename to be used to save Chrome preferences between test runs. Useful for debugging tests. It is recommended to also add this filename to `.gitignore`.
+
+Example:
+```
+karmatic --chromeDataDir .chrome
+```
 
 ## License
 

src/cli.js

@@ -15,7 +15,8 @@ let prog = sade('karmatic');
 prog
 	.version(version)
 	.option('--files', 'Minimatch pattern for test files')
-	.option('--headless', 'Run using Chrome Headless', true);
+	.option('--headless', 'Run using Chrome Headless', true)
+	.option('--chromeDataDir', 'Save Chrome preferences');
 
 prog
 	.command('run [...files]', '', { default: true })

src/configure.js

@@ -108,7 +108,8 @@ export default function configure(options) {
 
 		customLaunchers: {
 			KarmaticChrome: {
-				base: 'Chrome'
+				base: 'Chrome',
+				chromeDataDir: options.chromeDataDir ? path.resolve(cwd, options.chromeDataDir) : null
 			},
 			KarmaticChromeHeadless: {
 				base: 'ChromeHeadless',