Check in codegen test expectations.

test/codegen/expect/language/inferrer_synthesized_constructor_test.js

Index: test/codegen/expect/language/inferrer_synthesized_constructor_test.js
diff --git a/test/codegen/expect/language/inferrer_synthesized_constructor_test.js b/test/codegen/expect/language/inferrer_synthesized_constructor_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..6a865106f30441107989854d45578daa78ca1bc2
--- /dev/null
+++ b/test/codegen/expect/language/inferrer_synthesized_constructor_test.js
@@ -0,0 +1,35 @@
+dart_library.library('language/inferrer_synthesized_constructor_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__inferrer_synthesized_constructor_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 inferrer_synthesized_constructor_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  inferrer_synthesized_constructor_test.A = class A extends core.Object {
+    new(x) {
+      if (x === void 0) x = 'foo';
+      this.x = x;
+    }
+  };
+  dart.setSignature(inferrer_synthesized_constructor_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(inferrer_synthesized_constructor_test.A, [], [dart.dynamic])})
+  });
+  inferrer_synthesized_constructor_test.B = class B extends inferrer_synthesized_constructor_test.A {
+    new() {
+      super.new();
+    }
+  };
+  inferrer_synthesized_constructor_test.main = function() {
+    expect$.Expect.equals(84, dart.dsend(new inferrer_synthesized_constructor_test.A(42).x, '+', 42));
+    expect$.Expect.throws(dart.fn(() => dart.dsend(new inferrer_synthesized_constructor_test.B().x, '+', 42), VoidTovoid()), dart.fn(e => core.ArgumentError.is(e) || core.TypeError.is(e) || core.NoSuchMethodError.is(e), dynamicTobool()));
+  };
+  dart.fn(inferrer_synthesized_constructor_test.main, VoidTodynamic());
+  // Exports:
+  exports.inferrer_synthesized_constructor_test = inferrer_synthesized_constructor_test;
+});