Check in codegen test expectations.

test/codegen/expect/language/param_test.js

Index: test/codegen/expect/language/param_test.js
diff --git a/test/codegen/expect/language/param_test.js b/test/codegen/expect/language/param_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..e690de85524789f2601ecb261804958a6f8b3ab9
--- /dev/null
+++ b/test/codegen/expect/language/param_test.js
@@ -0,0 +1,38 @@
+dart_library.library('language/param_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__param_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 param_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  param_test.Helper = class Helper extends core.Object {
+    static foo(i) {
+      let b = null;
+      b = dart.notNull(i) + 1;
+      return core.int._check(b);
+    }
+  };
+  dart.setSignature(param_test.Helper, {
+    statics: () => ({foo: dart.definiteFunctionType(core.int, [core.int])}),
+    names: ['foo']
+  });
+  param_test.ParamTest = class ParamTest extends core.Object {
+    static testMain() {
+      expect$.Expect.equals(2, param_test.Helper.foo(1));
+    }
+  };
+  dart.setSignature(param_test.ParamTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  param_test.main = function() {
+    param_test.ParamTest.testMain();
+  };
+  dart.fn(param_test.main, VoidTodynamic());
+  // Exports:
+  exports.param_test = param_test;
+});