Check in codegen test expectations.

test/codegen/expect/language/cascade2_test.js

Index: test/codegen/expect/language/cascade2_test.js
diff --git a/test/codegen/expect/language/cascade2_test.js b/test/codegen/expect/language/cascade2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..143b57d7183ef6946aa8ef2dca2618c0e56abd5c
--- /dev/null
+++ b/test/codegen/expect/language/cascade2_test.js
@@ -0,0 +1,54 @@
+dart_library.library('language/cascade2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__cascade2_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 cascade2_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  cascade2_test.A = dart.callableClass(function A(...args) {
+    const self = this;
+    function call(...args) {
+      return self.call.apply(self, args);
+    }
+    call.__proto__ = this.__proto__;
+    call.new.apply(call, args);
+    return call;
+  }, class A extends core.Object {
+    new() {
+      this.foo = null;
+    }
+    add(list) {
+      this.foo = list;
+      dart.dsend(list, 'add', 2.5);
+      return this;
+    }
+    call(arg) {
+      return arg;
+    }
+  });
+  dart.setSignature(cascade2_test.A, {
+    methods: () => ({
+      add: dart.definiteFunctionType(dart.dynamic, [dart.dynamic]),
+      call: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])
+    })
+  });
+  cascade2_test.main = function() {
+    let foo = [42, 0];
+    let a = new cascade2_test.A();
+    let bar = ((() => {
+      dart.dcall(a.add(foo), 'WHAT');
+      return a;
+    })());
+    dart.dsetindex(a.foo, 0, new core.Object());
+    expect$.Expect.throws(dart.fn(() => dart.dsend(foo[dartx.get](0), '+', 2), VoidTovoid()), dart.fn(e => core.NoSuchMethodError.is(e), dynamicTobool()));
+  };
+  dart.fn(cascade2_test.main, VoidTodynamic());
+  // Exports:
+  exports.cascade2_test = cascade2_test;
+});