Setup abc tests for 3 smart-answers

We want to run abc tests for three smart-answers on the text in the
"Start Now" button.  We're using both content experiments (configured the
contentExperimentId for the test and variantIds for each cohort) and a
custom dimension to track the data as this gives us total flexibility
for tracking things.

Author: h-lame

app/assets/javascripts/smart-answers.js

@@ -1,3 +1,5 @@
+//= require start-now-button-abc-tests
+
 function browserSupportsHtml5HistoryApi() {
   return !! (history && history.replaceState && history.pushState);
 }

app/assets/javascripts/start-now-button-abc-tests.js

@@ -0,0 +1,45 @@
+//= require govuk/multivariate-test
+
+$(function(){
+  if(window.location.href.indexOf("/overseas-passports") > -1) {
+    new GOVUK.MultivariateTest({
+      el: '.get-started a',
+      name: 'startButton_osPassport_201602',
+      customDimensionIndex: 13,
+      contentExperimentId: 'egf8SiUzQJmsUuEIbxkCRw',
+      cohorts: {
+        original: { callback: function() {}, variantId: 0 },
+        getApplicationInfo: { html: 'Get application information', variantId: 1 },
+        next: { html: 'Next', variantId: 2 }
+      }
+    });
+  }
+
+  if(window.location.href.indexOf("/calculate-your-child-maintenance") > -1) {
+    new GOVUK.MultivariateTest({
+      el: '.get-started a',
+      name: 'startButton_calcChildM_201602',
+      customDimensionIndex: 13,
+      contentExperimentId: 'u0MzUmYRRzmb5mchoGp9Fw',
+      cohorts: {
+        original: { callback: function() {}, variantId: 0 },
+        calculate: { html: 'Calculate', variantId: 1 },
+        estimateChildMaintenance: { html: 'Estimate your child maintenance', variantId: 2 }
+      }
+    });
+  }
+
+  if(window.location.href.indexOf("/marriage-abroad") > -1) {
+    new GOVUK.MultivariateTest({
+      el: '.get-started a',
+      name: 'startButton_marriageAbroad_201602',
+      customDimensionIndex: 13,
+      contentExperimentId: 'Xk_FTKgiTwikoIH0fzPklw',
+      cohorts: {
+        original: { callback: function() {}, variantId: 0 },
+        findOutHow: { html: 'Find out how', variantId: 1 },
+        getMoreInfo: { html: 'Get more information', variantId: 2 }
+      }
+    });
+  }
+});