Check in codegen test expectations.

test/codegen/expect/language/parameter_types_specialization_test.js

Index: test/codegen/expect/language/parameter_types_specialization_test.js
diff --git a/test/codegen/expect/language/parameter_types_specialization_test.js b/test/codegen/expect/language/parameter_types_specialization_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..beeaa73bd60872171e5d77872c8a659e2342a231
--- /dev/null
+++ b/test/codegen/expect/language/parameter_types_specialization_test.js
@@ -0,0 +1,39 @@
+dart_library.library('language/parameter_types_specialization_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__parameter_types_specialization_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 parameter_types_specialization_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  parameter_types_specialization_test.A = class A extends core.Object {
+    foo(firstInvocation, a, b) {
+      if (a === void 0) a = 42;
+      if (b === void 0) b = 'foo';
+      if (dart.test(firstInvocation)) {
+        expect$.Expect.isTrue(typeof a == 'string');
+        expect$.Expect.isTrue(typeof b == 'number');
+      } else {
+        expect$.Expect.isTrue(typeof a == 'number');
+        expect$.Expect.isTrue(typeof b == 'string');
+      }
+    }
+  };
+  dart.setSignature(parameter_types_specialization_test.A, {
+    methods: () => ({foo: dart.definiteFunctionType(dart.void, [core.bool], [dart.dynamic, dart.dynamic])})
+  });
+  parameter_types_specialization_test.test = function() {
+    new parameter_types_specialization_test.A().foo(false);
+  };
+  dart.fn(parameter_types_specialization_test.test, VoidTodynamic());
+  parameter_types_specialization_test.main = function() {
+    parameter_types_specialization_test.test();
+    new parameter_types_specialization_test.A().foo(true, 'bar', 42);
+  };
+  dart.fn(parameter_types_specialization_test.main, VoidTodynamic());
+  // Exports:
+  exports.parameter_types_specialization_test = parameter_types_specialization_test;
+});