tests: fix cached config from multiple runs

Author: eddiemonge

test/wiredep_test.js

@@ -6,9 +6,33 @@
 var fs = require('fs-extra');
 var path = require('path');
 var assert = require('chai').assert;
-var wiredep = require('../wiredep');
+var wiredep;
+
+require.uncache = function (moduleName) {
+  var mod = require.resolve(moduleName);
+  if (mod && ((mod = require.cache[mod]) !== undefined)) {
+    (function run(mod) {
+      mod.children.forEach(function (child) {
+        run(child);
+      });
+      delete require.cache[mod.id];
+    })(mod);
+  }
+
+  Object.keys(module.constructor._pathCache).forEach(function(cacheKey) {
+    if (cacheKey.indexOf(moduleName)>0) {
+      delete module.constructor._pathCache[cacheKey];
+    }
+  });
+};
 
 describe('wiredep', function () {
+  beforeEach(function () {
+    wiredep = require('../wiredep');
+  })
+  afterEach(function () {
+    require.uncache('../wiredep');
+  })
   before(function() {
     fs.copySync('test/fixture', '.tmp');
     process.chdir('.tmp');