[Tests] use babel instead of NODE_PATH

.babelrc

@@ -3,7 +3,15 @@
   "sourceMaps": "inline",
   "env": {
     "test": {
-      "plugins": [ "istanbul" ]
+      "plugins": [
+        "istanbul",
+        [ "module-resolver", { "root": [ "./src/" ] } ]
+      ]
+    },
+    "testCompiled": {
+      "plugins": [
+        [ "module-resolver", { "root": [ "./lib/" ] } ]
+      ]
     }
   }
 }

package.json

@@ -22,13 +22,13 @@
     "build": "babel --quiet --out-dir lib src",
     "postbuild": "npm run copy-metafiles",
     "copy-metafiles": "for DIR in memo-parser resolvers/node resolvers/webpack utils; do cp LICENSE .npmrc \"${DIR}/\"; done",
-    "watch": "npm run mocha -- --watch tests/src",
+    "watch": "npm run tests-only -- -- --watch",
     "pretest": "linklocal",
     "posttest": "eslint .",
-    "mocha": "cross-env BABEL_ENV=test NODE_PATH=./src nyc -s mocha -R dot --recursive -t 5s",
-    "tests-only": "npm run mocha tests/src",
+    "mocha": "nyc -s mocha",
+    "tests-only": "cross-env BABEL_ENV=test npm run mocha tests/src",
     "test": "npm run tests-only",
-    "test-compiled": "npm run prepublish && NODE_PATH=./lib mocha --compilers js:babel-register --recursive tests/src",
+    "test-compiled": "npm run prepublish && BABEL_ENV=testCompiled mocha --compilers js:babel-register tests/src",
     "test-all": "npm test && for resolver in ./resolvers/*; do cd $resolver && npm test && cd ../..; done",
     "prepublish": "not-in-publish || npm run build",
     "coveralls": "nyc report --reporter lcovonly && cat ./coverage/lcov.info | coveralls"
@@ -60,6 +60,7 @@
     "babel-core": "^6.26.3",
     "babel-eslint": "^8.2.6",
     "babel-plugin-istanbul": "^4.1.6",
+    "babel-plugin-module-resolver": "^2.7.1",
     "babel-preset-es2015-argon": "latest",
     "babel-register": "^6.26.0",
     "babylon": "^6.18.0",

test/mocha.opts

@@ -0,0 +1,3 @@
+--reporter=dot
+--recursive
+-t 5s

tests/src/package.js

@@ -51,10 +51,17 @@ describe('package', function () {
       let preamble = 'import/'
 
       for (let rule in module.configs[configFile].rules) {
-        expect(() => require('rules/'+rule.slice(preamble.length)))
+        expect(() => require(getRulePath(rule.slice(preamble.length))))
           .not.to.throw(Error)
       }
     }
+
+    function getRulePath(ruleName) {
+      // 'require' does not work with dynamic paths because of the compilation step by babel
+      // (which resolves paths according to the root folder configuration)
+      // the usage of require.resolve on a static path gets around this
+      return path.resolve(require.resolve('rules/no-unresolved'), '..', ruleName)
+    }
   })
 
   it('marks deprecated rules in their metadata', function () {