Add command to debug tests

Run tests in debug mode (using Chrome's chrome://inspect tab)
`yarn test:debug`

Author: cyril-sf

README.md

@@ -82,6 +82,7 @@ Markdown report if any unknown globals are discovered.
 ```sh
 yarn test // run all tests once
 yarn test -- --watchAll // continuously run tests
+yarn test:debug // run tests in debug mode (using Chrome's chrome://inspect tab)
 ```
 
 Tests for this codemod work by comparing a paired input and output file in the `__testfixtures__` directory.  Pre-transform files should be of format `<test-name>.input.js`, expected output after the transform should be named `<test-name>.output.js`. Files must use the same `<test-name>` in their names so they can be compared.

package.json

@@ -6,7 +6,8 @@
   "repository": "https://github.com/ember-cli/ember-modules-codemod",
   "bin": "./bin/ember-modules-codemod.js",
   "scripts": {
-    "test": "jest"
+    "test": "jest",
+    "test:debug": "node --inspect node_modules/.bin/jest --runInBand"
   },
   "dependencies": {
     "chalk": "^1.1.3",