setup PumlWriter test structure

package.json

@@ -37,6 +37,7 @@
   },
   "repository": "schneiderlars/manipu",
   "scripts": {
-    "test": "nyc mocha --forbid-only \"test/**/*.test.js\""
+    "test": "nyc mocha --forbid-only \"test/**/*.test.js\"",
+    "test-debug": "nyc mocha --forbid-only \"test/**/*.test.js\"  --inspect-brk"
   }
 }

src/PumlWriter.js

@@ -0,0 +1,3 @@
+module.exports.bundleToPuml = function (bundle) {
+    return "asd";
+}

test/PumlWriter.test.js

@@ -0,0 +1,11 @@
+const PumlWriter = require('../src/PumlWriter')
+var assert = require('assert');
+
+describe('PumlWriter', function () {
+    describe('bundleToPuml', function () {
+        it('should return puml string', function () {
+            const result = PumlWriter.bundleToPuml();
+            assert.equal("", result);
+        });
+    });
+});