Check in codegen test expectations.

test/codegen/expect/language/for_in_test.js

Index: test/codegen/expect/language/for_in_test.js
diff --git a/test/codegen/expect/language/for_in_test.js b/test/codegen/expect/language/for_in_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f83650e9051536df3e679f260c1c1dc0e4e8adb1
--- /dev/null
+++ b/test/codegen/expect/language/for_in_test.js
@@ -0,0 +1,74 @@
+dart_library.library('language/for_in_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__for_in_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 for_in_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let ListOfString = () => (ListOfString = dart.constFn(core.List$(core.String)))();
+  let JSArrayOfListOfString = () => (JSArrayOfListOfString = dart.constFn(_interceptors.JSArray$(ListOfString())))();
+  let ListOfListOfString = () => (ListOfListOfString = dart.constFn(core.List$(ListOfString())))();
+  let JSArrayOfListOfListOfString = () => (JSArrayOfListOfListOfString = dart.constFn(_interceptors.JSArray$(ListOfListOfString())))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  for_in_test.ForInTest = class ForInTest extends core.Object {
+    static testMain() {
+      for_in_test.ForInTest.testSimple();
+      for_in_test.ForInTest.testGenericSyntax1();
+      for_in_test.ForInTest.testGenericSyntax2();
+      for_in_test.ForInTest.testGenericSyntax3();
+      for_in_test.ForInTest.testGenericSyntax4();
+    }
+    static testSimple() {
+      let list = JSArrayOfint().of([1, 3, 5]);
+      let sum = 0;
+      for (let i of list) {
+        sum = sum + dart.notNull(i);
+      }
+      expect$.Expect.equals(9, sum);
+    }
+    static testGenericSyntax1() {
+      let aCollection = JSArrayOfListOfString().of([]);
+      for (let strArrArr of aCollection) {
+      }
+    }
+    static testGenericSyntax2() {
+      let aCollection = JSArrayOfListOfString().of([]);
+      let strArrArr = null;
+      for (strArrArr of aCollection) {
+      }
+    }
+    static testGenericSyntax3() {
+      let aCollection = JSArrayOfListOfListOfString().of([]);
+      for (let strArrArr of aCollection) {
+      }
+    }
+    static testGenericSyntax4() {
+      let aCollection = JSArrayOfListOfListOfString().of([]);
+      let strArrArr = null;
+      for (strArrArr of aCollection) {
+      }
+    }
+  };
+  dart.setSignature(for_in_test.ForInTest, {
+    statics: () => ({
+      testMain: dart.definiteFunctionType(dart.dynamic, []),
+      testSimple: dart.definiteFunctionType(dart.void, []),
+      testGenericSyntax1: dart.definiteFunctionType(dart.void, []),
+      testGenericSyntax2: dart.definiteFunctionType(dart.void, []),
+      testGenericSyntax3: dart.definiteFunctionType(dart.void, []),
+      testGenericSyntax4: dart.definiteFunctionType(dart.void, [])
+    }),
+    names: ['testMain', 'testSimple', 'testGenericSyntax1', 'testGenericSyntax2', 'testGenericSyntax3', 'testGenericSyntax4']
+  });
+  for_in_test.main = function() {
+    for_in_test.ForInTest.testMain();
+  };
+  dart.fn(for_in_test.main, VoidTodynamic());
+  // Exports:
+  exports.for_in_test = for_in_test;
+});