Check in codegen test expectations.

test/codegen/expect/language/interceptor4_test.js

Index: test/codegen/expect/language/interceptor4_test.js
diff --git a/test/codegen/expect/language/interceptor4_test.js b/test/codegen/expect/language/interceptor4_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..6605775a85910318f60af34f21376c64a807cdae
--- /dev/null
+++ b/test/codegen/expect/language/interceptor4_test.js
@@ -0,0 +1,23 @@
+dart_library.library('language/interceptor4_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__interceptor4_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 interceptor4_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  interceptor4_test.main = function() {
+    let a = JSArrayOfint().of([1]);
+    let b = a[dartx.get](0);
+    expect$.Expect.equals('1', dart.toString(b));
+    expect$.Expect.isTrue(b[dartx.isOdd]);
+  };
+  dart.fn(interceptor4_test.main, VoidTodynamic());
+  // Exports:
+  exports.interceptor4_test = interceptor4_test;
+});