Fix ddc async test code

pkg/dev_compiler/test/browser/language_tests.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 define(['dart_sdk', 'async_helper', 'expect', 'unittest', 'is', 'require'],
       function(dart_sdk, async_helper, expect, unittest, is, require) {
   'use strict';
 
   async_helper = async_helper.async_helper;
   let minitest = expect.minitest;
@@ skipping 99 matching lines @@
       'compile_time_constant_k_test_none_multi': fail,
       'compile_time_constant_o_test_none_multi': fail,
       'const_evaluation_test_01_multi': fail,
       'const_switch_test_02_multi': fail,
       'const_switch_test_04_multi': fail,
       'constructor12_test': fail,
       'covariant_subtyping_tearoff2_test': fail,     
       'covariant_subtyping_tearoff3_test': fail,
       'covariant_subtyping_unsafe_call2_test': fail,
       'covariant_subtyping_unsafe_call3_test': fail,
+      'custom_await_stack_trace_test': fail,
       'cyclic_type2_test': fail,
       'cyclic_type_test_00_multi': fail,
       'cyclic_type_test_01_multi': fail,
       'cyclic_type_test_02_multi': fail,
       'cyclic_type_test_03_multi': fail,
       'cyclic_type_test_04_multi': fail,
 
       // Deferred libraries are not actually deferred. These tests all test
       // that synchronous access to the library fails.
       'deferred_call_empty_before_load_test': fail,
@@ skipping 70 matching lines @@
       'infinite_switch_label_test': fail,
       'infinity_test': fail,
       'initializing_formal_final_test': fail,
       'instance_creation_in_function_annotation_test': fail,
       'instanceof2_test': fail,
       'instanceof4_test_01_multi': fail,
       'instanceof4_test_none_multi': fail,
       'instanceof_optimized_test': fail,
       'integer_division_by_zero_test': fail,
       'issue_22780_test_01_multi': fail,
+      'issue23244_test': fail,
       'lazy_static3_test': fail,
       'least_upper_bound_expansive_test_none_multi': fail,
       'left_shift_test': fail,
       'list_is_test': fail,
       'list_literal3_test': fail,
       'many_generic_instanceof_test': fail,
       'many_named_arguments_test': whitelist,
       'map_literal10_test': fail,
       'map_literal7_test': fail,
       'memory_swap_test': skip_timeout,
       'method_invocation_test': fail,
       'mint_arithmetic_test': fail,
       'mixin_forwarding_constructor3_test': fail,
       'mixin_implements_test': fail,
       'mixin_regress_13688_test': fail,
       'modulo_test': fail,
       'named_parameter_clash_test': fail,
       'named_parameters_passing_falsy_test': is.firefox('<=50') ? fail : pass,
       'nan_identical_test': fail,
       'nested_switch_label_test': fail,
       'number_identifier_test_05_multi': fail,
       'number_identity2_test': fail,
       'numbers_test': fail,
       'redirecting_factory_reflection_test': fail,
       'reg_exp_test': whitelist,
       'regress_16640_test': fail,
       'regress_18535_test': fail,
+      'regress_22445_test': fail,
       'regress_22666_test': fail,
       'regress_22777_test': flaky,
       'setter_no_getter_test_01_multi': fail,
       'stack_overflow_stacktrace_test': fail,
       'stack_overflow_test': fail,
       'stacktrace_rethrow_error_test_none_multi': fail,
       'stacktrace_rethrow_error_test_withtraceparameter_multi': fail,
       'stacktrace_test': chrome_fail,
       'string_interpolate_null_test': fail,
       'switch_label2_test': fail,
@@ skipping 574 matching lines @@
           }
           finish(error);
         };
 
         async_helper.asyncTestInitialize(finish);
         if (has('slow')) this.timeout(10000);
 
         var result;
         try {
           var result = mainLibrary.main();
-          if (result && !(result instanceof dart_sdk.async.Future)) {
+          if (result && !(dart_sdk.async.Future.is(result))) {
             result = null;
           }
         } catch (e) {
           finish(e);
         }
 
         // Ensure this isn't a unittest
         if (!unittestAccidentallyInitialized &&
             unittest.src__test_environment.environment.initialized) {
           // This suppresses duplicate messages for later tests
           unittestAccidentallyInitialized = true;
           finish(new Error('Test ' + name + ' must be marked as a unittest'));
         } else if (!async_helper.asyncTestStarted) {
           if (!result) {
             finish();
           } else {
-            result.then(dart_sdk.dart.dynamic)(() => finish());
+            result.then(dart_sdk.dart.dynamic)(() => finish(),
+              { onError: (e) => finish(e) });
           }
         }
       });
     }
   }
 
   // We run these tests in a mocha test wrapper to avoid the confusing failure
   // case of dart unittests being interleaved with mocha tests.
   // In practice we are really just suppressing all mocha test behavior while
   // Dart unittests run and then re-enabling it when the dart tests complete.
@@ skipping 51 matching lines @@
 
     for (let action of unittest_tests) {
       try {
         action();
       } catch (e) {
         console.error("Caught error tying to setup test:", e);
       }
     }
   });
 });