Check in codegen test expectations.

test/codegen/expect/corelib/list_to_string_test.js

Index: test/codegen/expect/corelib/list_to_string_test.js
diff --git a/test/codegen/expect/corelib/list_to_string_test.js b/test/codegen/expect/corelib/list_to_string_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..d1559a450cfa3a167084cba8cfca62f29a259565
--- /dev/null
+++ b/test/codegen/expect/corelib/list_to_string_test.js
@@ -0,0 +1,61 @@
+dart_library.library('corelib/list_to_string_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__list_to_string_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const collection = dart_sdk.collection;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const list_to_string_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  list_to_string_test.MyList = class MyList extends collection.ListBase {
+    new(list) {
+      this.list = list;
+    }
+    get length() {
+      return core.int._check(dart.dload(this.list, 'length'));
+    }
+    set length(val) {
+      dart.dput(this.list, 'length', val);
+    }
+    get(index) {
+      return dart.dindex(this.list, index);
+    }
+    set(index, val) {
+      (() => {
+        return dart.dsetindex(this.list, index, val);
+      })();
+      return val;
+    }
+  };
+  dart.addSimpleTypeTests(list_to_string_test.MyList);
+  dart.setSignature(list_to_string_test.MyList, {
+    constructors: () => ({new: dart.definiteFunctionType(list_to_string_test.MyList, [dart.dynamic])}),
+    methods: () => ({
+      get: dart.definiteFunctionType(dart.dynamic, [core.int]),
+      set: dart.definiteFunctionType(dart.void, [core.int, dart.dynamic])
+    })
+  });
+  dart.defineExtensionMembers(list_to_string_test.MyList, ['get', 'set', 'length', 'length']);
+  let const$;
+  let const$0;
+  let const$1;
+  list_to_string_test.main = function() {
+    expect$.Expect.equals("[]", dart.toString([]));
+    expect$.Expect.equals("[1]", dart.toString(JSArrayOfint().of([1])));
+    expect$.Expect.equals("[1, 2]", dart.toString(JSArrayOfint().of([1, 2])));
+    expect$.Expect.equals("[]", dart.toString(const$ || (const$ = dart.constList([], dart.dynamic))));
+    expect$.Expect.equals("[1]", dart.toString(const$0 || (const$0 = dart.constList([1], core.int))));
+    expect$.Expect.equals("[1, 2]", dart.toString(const$1 || (const$1 = dart.constList([1, 2], core.int))));
+    expect$.Expect.equals("[]", new list_to_string_test.MyList([]).toString());
+    expect$.Expect.equals("[1]", new list_to_string_test.MyList(JSArrayOfint().of([1])).toString());
+    expect$.Expect.equals("[1, 2]", new list_to_string_test.MyList(JSArrayOfint().of([1, 2])).toString());
+  };
+  dart.fn(list_to_string_test.main, VoidTodynamic());
+  // Exports:
+  exports.list_to_string_test = list_to_string_test;
+});