Check in codegen test expectations.

test/codegen/expect/corelib/iterable_single_test.js

Index: test/codegen/expect/corelib/iterable_single_test.js
diff --git a/test/codegen/expect/corelib/iterable_single_test.js b/test/codegen/expect/corelib/iterable_single_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..f477b575c77a15b225e7e9a91de937bd92e2d9a4
--- /dev/null
+++ b/test/codegen/expect/corelib/iterable_single_test.js
@@ -0,0 +1,48 @@
+dart_library.library('corelib/iterable_single_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__iterable_single_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 iterable_single_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let SetOfint = () => (SetOfint = dart.constFn(core.Set$(core.int)))();
+  let VoidToint = () => (VoidToint = dart.constFn(dart.definiteFunctionType(core.int, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let const$;
+  let const$0;
+  let const$1;
+  iterable_single_test.main = function() {
+    let list1a = JSArrayOfint().of([1]);
+    let list1b = JSArrayOfint().of([1, 2, 3]);
+    let list1c = JSArrayOfint().of([]);
+    let list2a = const$ || (const$ = dart.constList([5], core.int));
+    let list2b = const$0 || (const$0 = dart.constList([4, 5], core.int));
+    let list2c = const$1 || (const$1 = dart.constList([], core.int));
+    let set1 = SetOfint().new();
+    set1.add(22);
+    let set2 = core.Set.new();
+    set2.add(11);
+    set2.add(12);
+    set2.add(13);
+    let set3 = core.Set.new();
+    expect$.Expect.equals(1, list1a[dartx.single]);
+    expect$.Expect.throws(dart.fn(() => list1b[dartx.single], VoidToint()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+    expect$.Expect.throws(dart.fn(() => list1c[dartx.single], VoidToint()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+    expect$.Expect.equals(5, list2a[dartx.single]);
+    expect$.Expect.throws(dart.fn(() => list2b[dartx.single], VoidToint()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+    expect$.Expect.throws(dart.fn(() => list2c[dartx.single], VoidToint()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+    expect$.Expect.equals(22, set1.single);
+    expect$.Expect.throws(dart.fn(() => set2.single, VoidTovoid()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+    expect$.Expect.throws(dart.fn(() => set3.single, VoidTovoid()), dart.fn(e => core.StateError.is(e), dynamicTobool()));
+  };
+  dart.fn(iterable_single_test.main, VoidTodynamic());
+  // Exports:
+  exports.iterable_single_test = iterable_single_test;
+});