Check in codegen test expectations.

test/codegen/expect/corelib/unicode_test.js

Index: test/codegen/expect/corelib/unicode_test.js
diff --git a/test/codegen/expect/corelib/unicode_test.js b/test/codegen/expect/corelib/unicode_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..9e6770d8304d09c5d590713d59aacfb10e083b75
--- /dev/null
+++ b/test/codegen/expect/corelib/unicode_test.js
@@ -0,0 +1,30 @@
+dart_library.library('corelib/unicode_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__unicode_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const unicode_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  unicode_test.UnicodeTest = class UnicodeTest extends core.Object {
+    static testMain() {
+      let lowerStrasse = core.String.fromCharCodes(JSArrayOfint().of([115, 116, 114, 97, 223, 101]));
+      expect$.Expect.equals("STRASSE", lowerStrasse[dartx.toUpperCase]());
+    }
+  };
+  dart.setSignature(unicode_test.UnicodeTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  unicode_test.main = function() {
+    unicode_test.UnicodeTest.testMain();
+  };
+  dart.fn(unicode_test.main, VoidTodynamic());
+  // Exports:
+  exports.unicode_test = unicode_test;
+});