imported code from webfuse-example

test/mocha.opts

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+-r jsdom-global/register

test/test_provider.js

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+const webfuse = require('../dist/webfuse')
+
+const chai = require('chai');
+const assert = chai.assert;
+
+describe('Provider', function() {
+
+    it('lookup should throw not implemented error', function() {
+        const provider = new webfuse.Provider();
+
+        return provider.lookup(1, 'root').then(
+            () => Promise.reject(new Error("reject expected")),
+            err => {
+                assert.instanceOf(err, webfuse.BadState);
+                assert.equal(webfuse.BadState.NOT_IMPLEMENTED, err.code);
+            }
+        );
+    });
+
+});