Check in codegen test expectations.

test/codegen/expect/corelib/iterable_skip_test.js

Index: test/codegen/expect/corelib/iterable_skip_test.js
diff --git a/test/codegen/expect/corelib/iterable_skip_test.js b/test/codegen/expect/corelib/iterable_skip_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..72154b5b4345f0b0334fb0b4b38a3c4e595d46f0
--- /dev/null
+++ b/test/codegen/expect/corelib/iterable_skip_test.js
@@ -0,0 +1,258 @@
+dart_library.library('corelib/iterable_skip_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__iterable_skip_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_skip_test = Object.create(null);
+  let JSArrayOfint = () => (JSArrayOfint = dart.constFn(_interceptors.JSArray$(core.int)))();
+  let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
+  let SetOfint = () => (SetOfint = dart.constFn(core.Set$(core.int)))();
+  let IterableOfint = () => (IterableOfint = dart.constFn(core.Iterable$(core.int)))();
+  let JSArrayOfIterable = () => (JSArrayOfIterable = dart.constFn(_interceptors.JSArray$(core.Iterable)))();
+  let IterableAndintAndintTodynamic = () => (IterableAndintAndintTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [core.Iterable, core.int, core.int])))();
+  let VoidToIterable = () => (VoidToIterable = dart.constFn(dart.definiteFunctionType(core.Iterable, [])))();
+  let dynamicTobool = () => (dynamicTobool = dart.constFn(dart.definiteFunctionType(core.bool, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let const$;
+  iterable_skip_test.main = function() {
+    let list1 = JSArrayOfint().of([1, 2, 3]);
+    let list2 = const$ || (const$ = dart.constList([4, 5], core.int));
+    let list3 = JSArrayOfString().of([]);
+    let set1 = SetOfint().new();
+    set1.add(11);
+    set1.add(12);
+    set1.add(13);
+    let set2 = core.Set.new();
+    let skip0 = list1[dartx.skip](0);
+    expect$.Expect.isTrue(!core.List.is(skip0));
+    let it = skip0[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(1, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(2, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(3, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    let skip1 = list1[dartx.skip](1);
+    expect$.Expect.isTrue(!core.List.is(skip1));
+    expect$.Expect.isTrue(!core.List.is(skip1[dartx.skip](2)[dartx.skip](1)));
+    it = skip1[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(2, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(3, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    let skip2 = list1[dartx.skip](2);
+    expect$.Expect.isTrue(!core.List.is(skip2));
+    expect$.Expect.isTrue(!core.List.is(skip2[dartx.skip](2)[dartx.skip](1)));
+    it = skip2[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(3, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    let skip3 = list1[dartx.skip](3);
+    expect$.Expect.isTrue(!core.List.is(skip3));
+    expect$.Expect.isTrue(!core.List.is(skip3[dartx.skip](2)[dartx.skip](1)));
+    it = skip3[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    let skip4 = list1[dartx.skip](4);
+    expect$.Expect.isTrue(!core.List.is(skip4));
+    expect$.Expect.isTrue(!core.List.is(skip4[dartx.skip](2)[dartx.skip](1)));
+    it = skip4[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip0 = list1[dartx.skip](0);
+    skip1 = skip0[dartx.skip](1);
+    skip2 = skip1[dartx.skip](1);
+    skip3 = skip2[dartx.skip](1);
+    skip4 = skip3[dartx.skip](1);
+    it = skip0[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(1, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(2, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(3, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    it = skip1[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(2, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(3, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    it = skip2[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(3, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    it = skip3[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    it = skip4[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip0 = list2[dartx.skip](0);
+    expect$.Expect.isTrue(!core.List.is(skip0));
+    expect$.Expect.isTrue(!core.List.is(skip0[dartx.skip](2)[dartx.skip](1)));
+    it = skip0[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(4, it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(5, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip1 = list2[dartx.skip](1);
+    expect$.Expect.isTrue(!core.List.is(skip1));
+    expect$.Expect.isTrue(!core.List.is(skip1[dartx.skip](2)[dartx.skip](1)));
+    it = skip1[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.equals(5, it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip2 = list2[dartx.skip](2);
+    expect$.Expect.isTrue(!core.List.is(skip2));
+    expect$.Expect.isTrue(!core.List.is(skip2[dartx.skip](2)[dartx.skip](1)));
+    it = skip2[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip3 = list2[dartx.skip](3);
+    expect$.Expect.isTrue(!core.List.is(skip3));
+    expect$.Expect.isTrue(!core.List.is(skip3[dartx.skip](2)[dartx.skip](1)));
+    it = skip3[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    let skip02 = list3[dartx.skip](0);
+    expect$.Expect.isTrue(!core.List.is(skip02));
+    expect$.Expect.isTrue(!core.List.is(skip02[dartx.skip](2)[dartx.skip](1)));
+    let it2 = skip02[dartx.iterator];
+    expect$.Expect.isNull(it2.current);
+    expect$.Expect.isFalse(it2.moveNext());
+    expect$.Expect.isNull(it2.current);
+    let skip12 = list3[dartx.skip](1);
+    expect$.Expect.isTrue(!core.List.is(skip12));
+    expect$.Expect.isTrue(!core.List.is(skip12[dartx.skip](2)[dartx.skip](1)));
+    it2 = skip12[dartx.iterator];
+    expect$.Expect.isNull(it2.current);
+    expect$.Expect.isFalse(it2.moveNext());
+    expect$.Expect.isNull(it2.current);
+    skip0 = set1.skip(0);
+    let copied = skip0[dartx.toList]();
+    expect$.Expect.equals(3, copied[dartx.length]);
+    expect$.Expect.isTrue(set1.contains(copied[dartx.get](0)));
+    expect$.Expect.isTrue(set1.contains(copied[dartx.get](1)));
+    expect$.Expect.isTrue(set1.contains(copied[dartx.get](2)));
+    expect$.Expect.isTrue(copied[dartx.get](0) != copied[dartx.get](1));
+    expect$.Expect.isTrue(copied[dartx.get](0) != copied[dartx.get](2));
+    expect$.Expect.isTrue(copied[dartx.get](1) != copied[dartx.get](2));
+    it = skip0[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.isNotNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.isNotNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.isNotNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip1 = set1.skip(1);
+    copied = skip1[dartx.toList]();
+    expect$.Expect.equals(2, copied[dartx.length]);
+    expect$.Expect.isTrue(set1.contains(copied[dartx.get](0)));
+    expect$.Expect.isTrue(set1.contains(copied[dartx.get](1)));
+    expect$.Expect.isTrue(copied[dartx.get](0) != copied[dartx.get](1));
+    it = skip1[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.isNotNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.isNotNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip2 = set1.skip(2);
+    copied = skip2[dartx.toList]();
+    expect$.Expect.equals(1, copied[dartx.length]);
+    expect$.Expect.isTrue(set1.contains(copied[dartx.get](0)));
+    it = skip2[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isTrue(it.moveNext());
+    expect$.Expect.isNotNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip3 = set1.skip(3);
+    it = skip3[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip4 = set1.skip(4);
+    it = skip4[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip0 = IterableOfint()._check(set2.skip(0));
+    it = skip0[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    skip1 = IterableOfint()._check(set2.skip(1));
+    it = skip1[dartx.iterator];
+    expect$.Expect.isNull(it.current);
+    expect$.Expect.isFalse(it.moveNext());
+    expect$.Expect.isNull(it.current);
+    function testSkipTake(input, skip, take) {
+      let expected = [];
+      let iter = input[dartx.iterator];
+      for (let i = 0; i < dart.notNull(skip); i++)
+        iter.moveNext();
+      for (let i = 0; i < dart.notNull(take); i++) {
+        if (!dart.test(iter.moveNext())) break;
+        expected[dartx.add](iter.current);
+      }
+      expect$.Expect.listEquals(expected, input[dartx.skip](skip)[dartx.take](take)[dartx.toList]());
+    }
+    dart.fn(testSkipTake, IterableAndintAndintTodynamic());
+    let longList = JSArrayOfint().of([1, 4, 5, 3, 8, 11, 12, 6, 9, 10, 13, 7, 2, 14, 15]);
+    let bigSet = longList[dartx.toSet]();
+    for (let collection of JSArrayOfIterable().of([longList, longList[dartx.reversed], bigSet])) {
+      testSkipTake(collection, 0, 0);
+      testSkipTake(collection, 0, 5);
+      testSkipTake(collection, 0, 15);
+      testSkipTake(collection, 0, 25);
+      testSkipTake(collection, 5, 0);
+      testSkipTake(collection, 5, 5);
+      testSkipTake(collection, 5, 10);
+      testSkipTake(collection, 5, 20);
+      testSkipTake(collection, 15, 0);
+      testSkipTake(collection, 15, 5);
+      testSkipTake(collection, 20, 0);
+      testSkipTake(collection, 20, 5);
+      expect$.Expect.throws(dart.fn(() => longList[dartx.skip](-1), VoidToIterable()), dart.fn(e => core.RangeError.is(e), dynamicTobool()));
+    }
+  };
+  dart.fn(iterable_skip_test.main, VoidTodynamic());
+  // Exports:
+  exports.iterable_skip_test = iterable_skip_test;
+});