Check in codegen test expectations.

test/codegen/expect/corelib/list_first_test.js

Index: test/codegen/expect/corelib/list_first_test.js
diff --git a/test/codegen/expect/corelib/list_first_test.js b/test/codegen/expect/corelib/list_first_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f9dbb57229d51b2645fc26995e1b21628030d852
--- /dev/null
+++ b/test/codegen/expect/corelib/list_first_test.js
@@ -0,0 +1,36 @@
+dart_library.library('corelib/list_first_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__list_first_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 list_first_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let ListTovoid = () => (ListTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [core.List])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  list_first_test.test = function(list) {
+    if (dart.test(list[dartx.isEmpty])) {
+      expect$.Expect.throws(dart.fn(() => list[dartx.first], VoidTovoid()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+    } else {
+      expect$.Expect.equals(list[dartx.get](0), list[dartx.first]);
+    }
+  };
+  dart.fn(list_first_test.test, ListTovoid());
+  let const$;
+  let const$0;
+  list_first_test.main = function() {
+    list_first_test.test(JSArrayOfint().of([1, 2, 3]));
+    list_first_test.test(const$ || (const$ = dart.constList(["foo", "bar"], core.String)));
+    list_first_test.test([]);
+    list_first_test.test(const$0 || (const$0 = dart.constList([], dart.dynamic)));
+  };
+  dart.fn(list_first_test.main, VoidTodynamic());
+  // Exports:
+  exports.list_first_test = list_first_test;
+});