Check in codegen test expectations.

test/codegen/expect/language/class_syntax2_test.js

Index: test/codegen/expect/language/class_syntax2_test.js
diff --git a/test/codegen/expect/language/class_syntax2_test.js b/test/codegen/expect/language/class_syntax2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..e689a6f886ecb746bb6ec9e25ade83ac87a41b1d
--- /dev/null
+++ b/test/codegen/expect/language/class_syntax2_test.js
@@ -0,0 +1,42 @@
+dart_library.library('language/class_syntax2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__class_syntax2_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 class_syntax2_test = Object.create(null);
+  let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  class_syntax2_test.main = function() {
+    let c = new class_syntax2_test.Cool(true);
+    expect$.Expect.stringEquals('{}', dart.str`${c.thing}`);
+    c = new class_syntax2_test.Cool(false);
+    expect$.Expect.stringEquals('[]', dart.str`${c.thing}`);
+    c = new class_syntax2_test.Cool.alt(true);
+    expect$.Expect.stringEquals('{}', dart.str`${c.thing}`);
+    c = new class_syntax2_test.Cool.alt(false);
+    expect$.Expect.stringEquals('[]', dart.str`${c.thing}`);
+  };
+  dart.fn(class_syntax2_test.main, VoidTovoid());
+  class_syntax2_test.Cool = class Cool extends core.Object {
+    new(option) {
+      this.thing = dart.test(option) ? dart.map({}, core.String, core.String) : JSArrayOfString().of([]);
+    }
+    alt(option) {
+      this.thing = !dart.test(option) ? JSArrayOfString().of([]) : dart.map({}, core.String, core.String);
+    }
+  };
+  dart.defineNamedConstructor(class_syntax2_test.Cool, 'alt');
+  dart.setSignature(class_syntax2_test.Cool, {
+    constructors: () => ({
+      new: dart.definiteFunctionType(class_syntax2_test.Cool, [core.bool]),
+      alt: dart.definiteFunctionType(class_syntax2_test.Cool, [core.bool])
+    })
+  });
+  // Exports:
+  exports.class_syntax2_test = class_syntax2_test;
+});