Check in codegen test expectations.

test/codegen/expect/corelib/list_literal_is_growable_test.js

Index: test/codegen/expect/corelib/list_literal_is_growable_test.js
diff --git a/test/codegen/expect/corelib/list_literal_is_growable_test.js b/test/codegen/expect/corelib/list_literal_is_growable_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..6761d04506cbbc2ba299e6119db5952fead283cf
--- /dev/null
+++ b/test/codegen/expect/corelib/list_literal_is_growable_test.js
@@ -0,0 +1,21 @@
+dart_library.library('corelib/list_literal_is_growable_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__list_literal_is_growable_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 list_literal_is_growable_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  list_literal_is_growable_test.main = function() {
+    let l = [];
+    l[dartx.add](1);
+    expect$.Expect.equals(1, l[dartx.length]);
+    expect$.Expect.equals(1, l[dartx.get](0));
+  };
+  dart.fn(list_literal_is_growable_test.main, VoidTodynamic());
+  // Exports:
+  exports.list_literal_is_growable_test = list_literal_is_growable_test;
+});