Add corelib tests

test/codegen/corelib/iterable_join_test.dart

Index: test/codegen/corelib/iterable_join_test.dart
diff --git a/test/codegen/corelib/iterable_join_test.dart b/test/codegen/corelib/iterable_join_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..133661715cb1a66e8cc06f3aba7442b0cfdc54a7
--- /dev/null
+++ b/test/codegen/corelib/iterable_join_test.dart
@@ -0,0 +1,142 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:expect/expect.dart";
+
+class IC {
+  int count = 0;
+  String toString() => "${count++}";
+}
+
+testJoin(String expect, Iterable iterable, [String separator]) {
+  if (separator != null) {
+    Expect.equals(expect, iterable.join(separator));
+  } else {
+    Expect.equals(expect, iterable.join());
+  }
+}
+
+testCollections() {
+  testJoin("", [], ",");
+  testJoin("", [], "");
+  testJoin("", []);
+  testJoin("", new Set(), ",");
+  testJoin("", new Set(), "");
+  testJoin("", new Set());
+
+  testJoin("42", [42], ",");
+  testJoin("42", [42], "");
+  testJoin("42", [42]);
+  testJoin("42", new Set()..add(42), ",");
+  testJoin("42", new Set()..add(42), "");
+  testJoin("42", new Set()..add(42));
+
+  testJoin("a,b,c,d", ["a", "b", "c", "d"], ",");
+  testJoin("abcd", ["a", "b", "c", "d"], "");
+  testJoin("abcd", ["a", "b", "c", "d"]);
+  testJoin("null,b,c,d", [null,"b","c","d"], ",");
+  testJoin("1,2,3,4", [1, 2, 3, 4], ",");
+  var ic = new IC();
+  testJoin("0,1,2,3", [ic, ic, ic, ic], ",");
+
+  var set = new Set()..add(1)..add(2)..add(3);
+  var perm = new Set()..add("123")..add("132")..add("213")
+                      ..add("231")..add("312")..add("321");
+  var setString = set.join();
+  Expect.isTrue(perm.contains(setString), "set: $setString");
+
+  void testArray(array) {
+    testJoin("1,3,5,7,9", array.where((i) => i.isOdd), ",");
+    testJoin("0,2,4,6,8,10,12,14,16,18", array.map((i) => i * 2), ",");
+    testJoin("5,6,7,8,9", array.skip(5), ",");
+    testJoin("5,6,7,8,9", array.skipWhile((i) => i < 5), ",");
+    testJoin("0,1,2,3,4", array.take(5), ",");
+    testJoin("0,1,2,3,4", array.takeWhile((i) => i < 5), ",");
+  }
+  testArray([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
+  var fixedArray = new List(10);
+  for (int i = 0; i < 10; i++) {
+    fixedArray[i] = i;
+  }
+  testArray(fixedArray);
+  testArray(const [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
+
+  testJoin("a,b,c,d", ["a", "b", "c", "d"].map((x) => x), ",");
+  testJoin("abcd", ["a", "b", "c", "d"].map((x) => x), "");
+  testJoin("abcd", ["a", "b", "c", "d"].map((x) => x));
+  testJoin("null,b,c,d", [null,"b","c","d"].map((x) => x), ",");
+  testJoin("1,2,3,4", [1, 2, 3, 4].map((x) => x), ",");
+  testJoin("4,5,6,7", [ic, ic, ic, ic].map((x) => x), ",");
+}
+
+void testStringVariants() {
+  // ASCII
+  testJoin("axbxcxd", ["a", "b", "c", "d"], "x");
+  testJoin("a\u2000b\u2000c\u2000d", ["a", "b", "c", "d"], "\u2000");
+  testJoin("abcd", ["a", "b", "c", "d"], "");
+  testJoin("abcd", ["a", "b", "c", "d"]);
+  // Non-ASCII
+  testJoin("axbxcx\u2000", ["a", "b", "c", "\u2000"], "x");
+  testJoin("a\u2000b\u2000c\u2000\u2000", ["a", "b", "c", "\u2000"], "\u2000");
+  testJoin("abc\u2000", ["a", "b", "c", "\u2000"], "");
+  testJoin("abc\u2000", ["a", "b", "c", "\u2000"]);
+  // Long-ASCII
+  testJoin("ax" * 255 + "a", new List.generate(256, (_) => "a"), "x");
+  testJoin("a" * 256, new List.generate(256, (_) => "a"));
+  // Long-Non-ASCII
+  testJoin("a\u2000" * 255 + "a", new List.generate(256, (_) => "a"), "\u2000");
+  testJoin("\u2000" * 256, new List.generate(256, (_) => "\u2000"));
+  testJoin("\u2000x" * 255 + "\u2000",
+           new List.generate(256, (_) => "\u2000"), "x");
+
+  var o1 = new Stringable("x");
+  var o2 = new Stringable("\ufeff");
+  testJoin("xa" * 3 + "x", [o1, o1, o1, o1], "a");
+  testJoin("x" * 4, [o1, o1, o1, o1], "");
+  testJoin("x" * 4, [o1, o1, o1, o1]);
+
+  testJoin("\ufeffx" * 3 + "\ufeff", [o2, o2, o2, o2], "x");
+  testJoin("\ufeff" * 4, [o2, o2, o2, o2], "");
+  testJoin("\ufeff" * 4, [o2, o2, o2, o2]);
+
+  testJoin("a\u2000x\ufeff", ["a", "\u2000", o1, o2]);
+  testJoin("a\u2000\ufeffx", ["a", "\u2000", o2, o1]);
+  testJoin("ax\u2000\ufeff", ["a", o1, "\u2000", o2]);
+  testJoin("ax\ufeff\u2000", ["a", o1, o2, "\u2000"]);
+  testJoin("a\ufeffx\u2000", ["a", o2, o1, "\u2000"]);
+  testJoin("a\ufeff\u2000x", ["a", o2, "\u2000", o1]);
+
+  testJoin("\u2000ax\ufeff", ["\u2000", "a", o1, o2]);
+  testJoin("\u2000a\ufeffx", ["\u2000", "a", o2, o1]);
+  testJoin("xa\u2000\ufeff", [o1, "a", "\u2000", o2]);
+  testJoin("xa\ufeff\u2000", [o1, "a", o2, "\u2000"]);
+  testJoin("\ufeffax\u2000", [o2, "a", o1, "\u2000"]);
+  testJoin("\ufeffa\u2000x", [o2, "a", "\u2000", o1]);
+
+  testJoin("\u2000xa\ufeff", ["\u2000", o1, "a", o2]);
+  testJoin("\u2000\ufeffax", ["\u2000", o2, "a", o1]);
+  testJoin("x\u2000a\ufeff", [o1, "\u2000", "a", o2]);
+  testJoin("x\ufeffa\u2000", [o1, o2, "a", "\u2000"]);
+  testJoin("\ufeffxa\u2000", [o2, o1, "a", "\u2000"]);
+  testJoin("\ufeff\u2000ax", [o2, "\u2000", "a", o1]);
+
+  testJoin("\u2000x\ufeffa", ["\u2000", o1, o2, "a"]);
+  testJoin("\u2000\ufeffxa", ["\u2000", o2, o1, "a"]);
+  testJoin("x\u2000\ufeffa", [o1, "\u2000", o2, "a"]);
+  testJoin("x\ufeff\u2000a", [o1, o2, "\u2000", "a"]);
+  testJoin("\ufeffx\u2000a", [o2, o1, "\u2000", "a"]);
+  testJoin("\ufeff\u2000xa", [o2, "\u2000", o1, "a"]);
+}
+
+class Stringable {
+  final String value;
+  Stringable(this.value);
+  String toString() => value;
+}
+
+main() {
+  testCollections();
+  testStringVariants();
+  // TODO(lrn): test scalar lists.
+}