Check in codegen test expectations.

test/codegen/expect/lib/convert/close_test.js

Index: test/codegen/expect/lib/convert/close_test.js
diff --git a/test/codegen/expect/lib/convert/close_test.js b/test/codegen/expect/lib/convert/close_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..d5717d16075bc3ebee522763268d82be10ea59c8
--- /dev/null
+++ b/test/codegen/expect/lib/convert/close_test.js
@@ -0,0 +1,48 @@
+dart_library.library('lib/convert/close_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__close_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const convert = dart_sdk.convert;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const close_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let ListOfint = () => (ListOfint = dart.constFn(core.List$(core.int)))();
+  let SinkOfListOfint = () => (SinkOfListOfint = dart.constFn(core.Sink$(ListOfint())))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  close_test.MySink = class MySink extends core.Object {
+    new() {
+      this.accumulated = JSArrayOfint().of([]);
+      this.isClosed = false;
+    }
+    add(list) {
+      this.accumulated[dartx.addAll](list);
+      list[dartx.length];
+    }
+    close() {
+      this.isClosed = true;
+    }
+  };
+  close_test.MySink[dart.implements] = () => [SinkOfListOfint()];
+  dart.setSignature(close_test.MySink, {
+    methods: () => ({
+      add: dart.definiteFunctionType(dart.void, [core.List$(core.int)]),
+      close: dart.definiteFunctionType(dart.void, [])
+    })
+  });
+  close_test.main = function() {
+    let mySink = new close_test.MySink();
+    let byteSink = convert.ByteConversionSink.from(mySink);
+    byteSink.add(JSArrayOfint().of([1, 2, 3]));
+    byteSink.close();
+    expect$.Expect.listEquals(JSArrayOfint().of([1, 2, 3]), mySink.accumulated);
+    expect$.Expect.isTrue(mySink.isClosed);
+  };
+  dart.fn(close_test.main, VoidTodynamic());
+  // Exports:
+  exports.close_test = close_test;
+});