Add feature tests for TextDecoder

test/features/tests.js

@@ -469,6 +469,18 @@ var tests = [
     impact: 'Important',
     area: 'Core'
   },
+  {
+    id: 'TextDecoder',
+    name: 'TextDecoder is present',
+    run: function () {
+      if (typeof TextDecoder != 'undefined')
+        return { output: 'Success', emulated: '' };
+      else
+        return { output: 'Failed', emulated: 'No' };
+    },
+    impact: 'Critical',
+    area: 'Core'
+  },
   {
     id: 'Worker',
     name: 'Worker is present',
@@ -543,6 +555,46 @@ var tests = [
     },
     impact: 'Important',
     area: 'Core'
+  },
+  {
+    id: 'Worker-TextDecoder',
+    name: 'TextDecoder is present in web workers',
+    run: function () {
+      if (typeof Worker == 'undefined')
+        return { output: 'Skipped', emulated: '' };
+
+      var emulatable = typeof TextDecoder !== 'undefined';
+      try {
+        var worker = new Worker('worker-stub.js');
+
+        var promise = new Promise();
+        var timeout = setTimeout(function () {
+          promise.resolve({ output: 'Failed',
+                            emulated: emulatable ? '?' : 'No' });
+        }, 5000);
+
+        worker.addEventListener('message', function (e) {
+          var data = e.data;
+          if (data.action === 'TextDecoder') {
+            if (data.result) {
+              promise.resolve({ output: 'Success', emulated: '' });
+            } else {
+              promise.resolve({ output: 'Failed',
+                                emulated: data.emulated ? 'Yes' : 'No' });
+            }
+          } else {
+            promise.resolve({ output: 'Failed',
+                              emulated: emulatable ? 'Yes' : 'No' });
+          }
+        });
+        worker.postMessage({action: 'TextDecoder'});
+        return promise;
+      } catch (e) {
+        return { output: 'Failed', emulated: emulatable ? 'Yes' : 'No' };
+      }
+    },
+    impact: 'Important',
+    area: 'Core'
   }
 ];
 

test/features/worker-stub.js

@@ -27,6 +27,11 @@ onmessage = function (e) {
         'responseArrayBuffer' in xhr || 'mozResponseArrayBuffer' in xhr;
     postMessage({action: 'xhr', result: responseExists});
     break;
+  case 'TextDecoder':
+    postMessage({action: 'TextDecoder',
+                 result: typeof TextDecoder !== 'undefined',
+                 emulated: typeof FileReaderSync !== 'undefined'});
+    break;
   }
 };