Replaced hard-coded guides link with /current

lib/ember-test-helpers/test-module-for-component.js

@@ -55,7 +55,7 @@ export default class extends TestModule {
       this.setupSteps.push(this.setupComponentUnitTest);
     } else {
       this.callbacks.subject = function() {
-        throw new Error("component integration tests do not support `subject()`. Instead, render the component as if it were HTML: `this.render('<my-component foo=true>');`. For more information, read: http://guides.emberjs.com/v2.2.0/testing/testing-components/");
+        throw new Error("component integration tests do not support `subject()`. Instead, render the component as if it were HTML: `this.render('<my-component foo=true>');`. For more information, read: http://guides.emberjs.com/current/testing/testing-components/");
       };
       this.setupSteps.push(this.setupComponentIntegrationTest);
       this.teardownSteps.unshift(this.teardownComponent);