Check in codegen test expectations.

test/codegen/expect/language/default_implementation_test.js

+dart_library.library('language/default_implementation_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__default_implementation_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const default_implementation_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  default_implementation_test.Point = class Point extends core.Object {
+    static new(x, y) {
+      return new default_implementation_test.PointImplementation(x, y);
+    }
+  };
+  dart.setSignature(default_implementation_test.Point, {
+    constructors: () => ({new: dart.definiteFunctionType(default_implementation_test.Point, [core.int, core.int])})
+  });
+  default_implementation_test.PointImplementation = class PointImplementation extends core.Object {
+    new(x, y) {
+      this.x = x;
+      this.y = y;
+    }
+  };
+  default_implementation_test.PointImplementation[dart.implements] = () => [default_implementation_test.Point];
+  dart.setSignature(default_implementation_test.PointImplementation, {
+    constructors: () => ({new: dart.definiteFunctionType(default_implementation_test.PointImplementation, [core.int, core.int])})
+  });
+  default_implementation_test.DefaultImplementationTest = class DefaultImplementationTest extends core.Object {
+    static testMain() {
+      let point = default_implementation_test.Point.new(4, 2);
+      expect$.Expect.equals(4, point.x);
+      expect$.Expect.equals(2, point.y);
+    }
+  };
+  dart.setSignature(default_implementation_test.DefaultImplementationTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.void, [])}),
+    names: ['testMain']
+  });
+  default_implementation_test.main = function() {
+    default_implementation_test.DefaultImplementationTest.testMain();
+  };
+  dart.fn(default_implementation_test.main, VoidTodynamic());
+  // Exports:
+  exports.default_implementation_test = default_implementation_test;
+});