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gaia/apps/system/test/unit/promise_test.js

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+ /** global*/
+'use strict';
+
+suite('Promise', function() {
+  var subject;
+  setup(function() {
+    subject = {};
+    subject.promiseMethod = function() {
+      return Promise.resolve();
+    };
+    subject.promiseFirstFunctionErrorMethod = function() {
+      return new Promise((resolve) => {
+        throw new Error('This is an error.');
+      });
+    };
+    subject.promiseThenFunctionErrorMethod = function() {
+      return Promise.resolve().then(() => {
+        throw new Error('This is an error.');
+      });
+    };
+  });
+  test('what if error in the first method', function(done) {
+    subject.promiseFirstFunctionErrorMethod().catch((err) => {
+      done();
+    });
+  });
+
+  test('what if error in the then method', function(done) {
+    subject.promiseThenFunctionErrorMethod().catch((err) => {
+      done();
+    });
+  });
+});