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gaia/apps/email/test/marionette/font_utils_test.js

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+'use strict';
+
+marionette('FontSizeUtils >', function() {
+  var ReflowHelper =
+      require('../../../../tests/jsmarionette/plugins/reflow_helper.js');
+
+  var assert = require('assert');
+
+  var EMAIL_APP = 'app://email.gaiamobile.org';
+  var client = marionette.client();
+
+  var reflowHelper, sys;
+
+  setup(function() {
+    sys = client.loader.getAppClass('system');
+    reflowHelper = new ReflowHelper(client);
+
+    var email = sys.waitForLaunch(EMAIL_APP);
+    client.waitFor(function() {
+      return email.displayed();
+    });
+
+    client.apps.switchToApp(EMAIL_APP);
+  });
+
+  test('FontSizeUtils._reformatHeaderText creates 1 reflow a header',
+  function() {
+    reflowHelper.startTracking(EMAIL_APP);
+    var beforeCount = reflowHelper.getCount();
+
+    var headerCount = client.executeAsyncScript(function() {
+
+      // Change the text of each header to trigger resize logic.
+      var reformatHeaders = function() {
+        var headers = document.querySelectorAll('header > h1');
+        for (var i = 0; i < headers.length; i++) {
+          headers[i].textContent =
+            'really large giant header that couldnt possibly fit';
+        }
+        marionetteScriptFinished(headers.length);
+      };
+
+      if (document.readyState === 'loading') {
+        window.addEventListener('DOMContentLoaded', reformatHeaders);
+      } else {
+        reformatHeaders();
+      }
+    });
+
+    // Make sure we have at most as many reflows as there are headers.
+    var reflowCount = reflowHelper.getCount() - beforeCount;
+    assert(reflowCount <= headerCount, 'Performed too many reflows');
+
+    // Now set all the header text really small, and check reflow count;
+    beforeCount = reflowHelper.getCount();
+    var newHeaderCount = client.executeAsyncScript(function() {
+
+      // Change the text of each header to trigger resize logic.
+      var reformatHeaders = function() {
+        var headers = document.querySelectorAll('header > h1');
+        for (var i = 0; i < headers.length; i++) {
+          headers[i].textContent = 'tiny';
+        }
+        marionetteScriptFinished(headers.length);
+      };
+
+      if (document.readyState === 'loading') {
+        window.addEventListener('DOMContentLoaded', reformatHeaders);
+      } else {
+        reformatHeaders();
+      }
+    });
+
+    assert.equal(headerCount, newHeaderCount, 'header count stays the same');
+    reflowCount = reflowHelper.getCount() - beforeCount;
+    assert(reflowCount <= newHeaderCount, 'Performed too many reflows');
+
+    reflowHelper.stopTracking();
+    assert(true, 'created 1 reflow per header');
+  });
+});