Check in codegen test expectations.

test/codegen/expect/language/cascade_nested_test.js

Index: test/codegen/expect/language/cascade_nested_test.js
diff --git a/test/codegen/expect/language/cascade_nested_test.js b/test/codegen/expect/language/cascade_nested_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..d788abf81d659b2fb060b9c8ccf9b866e2a9bfcb
--- /dev/null
+++ b/test/codegen/expect/language/cascade_nested_test.js
@@ -0,0 +1,39 @@
+dart_library.library('language/cascade_nested_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__cascade_nested_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 cascade_nested_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  cascade_nested_test.Foo = class Foo extends core.Object {
+    new() {
+      this.x = null;
+    }
+  };
+  cascade_nested_test.Bar = class Bar extends core.Object {
+    new() {
+      this.foo = null;
+      this.y = null;
+    }
+  };
+  cascade_nested_test.main = function() {
+    let bar = new cascade_nested_test.Bar();
+    bar.foo = (() => {
+      let _ = new cascade_nested_test.Foo();
+      _.x = 42;
+      return _;
+    })();
+    bar.y = 38;
+    expect$.Expect.isTrue(cascade_nested_test.Bar.is(bar));
+    expect$.Expect.isTrue(cascade_nested_test.Foo.is(bar.foo));
+    expect$.Expect.equals(bar.foo.x, 42);
+    expect$.Expect.equals(bar.y, 38);
+  };
+  dart.fn(cascade_nested_test.main, VoidTodynamic());
+  // Exports:
+  exports.cascade_nested_test = cascade_nested_test;
+});