Fix bug in equalsIgnoreAsciiCase.

Add tests.

R=floitsch@google.com, nweiz@google.com

Review URL: https://codereview.chromium.org//2484163002 .
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8794fa7..2c398b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.12.1
+
+* Fix bug in `equalsIgnoreAsciiCase`.
+
 ## 1.12.0
 
 * Add `CaseInsensitiveEquality`.
diff --git a/lib/src/comparators.dart b/lib/src/comparators.dart
index ca2b3c7..b0824a8 100644
--- a/lib/src/comparators.dart
+++ b/lib/src/comparators.dart
@@ -34,8 +34,8 @@
     if (aChar ^ bChar != _asciiCaseBit) return false;

     // If it's possible, then check if either character is actually an ASCII

     // letter.

-    int aCharUpperCase = aChar | _asciiCaseBit;

-    if (_upperCaseA <= aCharUpperCase && aCharUpperCase <= _upperCaseZ) {

+    int aCharLowerCase = aChar | _asciiCaseBit;

+    if (_lowerCaseA <= aCharLowerCase && aCharLowerCase <= _lowerCaseZ) {

       continue;

     }

     return false;

diff --git a/lib/src/equality.dart b/lib/src/equality.dart
index 39e4ad5..a901297 100644
--- a/lib/src/equality.dart
+++ b/lib/src/equality.dart
@@ -4,6 +4,8 @@
 
 import "dart:collection";
 
+import "comparators.dart";
+
 const int _HASH_MASK = 0x7fffffff;
 
 /// A generic equality relation on objects.
diff --git a/pubspec.yaml b/pubspec.yaml
index ad3f111..36e3054 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: collection
-version: 1.12.0
+version: 1.12.1
 author: Dart Team <misc@dartlang.org>
 description: Collections and utilities functions and classes related to collections.
 homepage: https://www.github.com/dart-lang/collection
diff --git a/test/ignore_ascii_case_test.dart b/test/ignore_ascii_case_test.dart
new file mode 100644
index 0000000..787f76f
--- /dev/null
+++ b/test/ignore_ascii_case_test.dart
@@ -0,0 +1,58 @@
+// Copyright (c) 2016, 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.
+
+/// Tests case-ignoring compare and equality.
+
+import "package:collection/collection.dart";
+import "package:test/test.dart";
+
+main() {
+  test("equality ignore ASCII case", () {
+    var strings = [
+      "0@`aopz[{",
+      "0@`aopz[{",
+      "0@`Aopz[{",
+      "0@`aOpz[{",
+      "0@`AOpz[{",
+      "0@`aoPz[{",
+      "0@`AoPz[{",
+      "0@`aOPz[{",
+      "0@`AOPz[{",
+      "0@`aopZ[{",
+      "0@`AopZ[{",
+      "0@`aOpZ[{",
+      "0@`AOpZ[{",
+      "0@`aoPZ[{",
+      "0@`AoPZ[{",
+      "0@`aOPZ[{",
+      "0@`AOPZ[{",
+    ];
+
+    for (var s1 in strings) {
+      for (var s2 in strings) {
+        var reason = "$s1 =?= $s2";
+        expect(equalsIgnoreAsciiCase(s1, s2), true, reason: reason);
+        expect(hashIgnoreAsciiCase(s1), hashIgnoreAsciiCase(s2),
+               reason: reason);
+      }
+    }
+
+    var upperCaseLetters = "@`abcdefghijklmnopqrstuvwxyz[{åÅ";
+    var lowerCaseLetters = "@`ABCDEFGHIJKLMNOPQRSTUVWXYZ[{åÅ";
+    expect(equalsIgnoreAsciiCase(upperCaseLetters, lowerCaseLetters), true);
+
+    testChars(char1, char2, areEqual) {
+      expect(equalsIgnoreAsciiCase(char1, char2), areEqual,
+             reason: "$char1 ${areEqual ? "=" : "!"}= $char2");
+    }
+    for (int i = 0; i < upperCaseLetters.length; i++) {
+      for (int j = 0; i < upperCaseLetters.length; i++) {
+        testChars(upperCaseLetters[i], upperCaseLetters[j], i == j);
+        testChars(lowerCaseLetters[i], upperCaseLetters[j], i == j);
+        testChars(upperCaseLetters[i], lowerCaseLetters[j], i == j);
+        testChars(lowerCaseLetters[i], lowerCaseLetters[j], i == j);
+      }
+    }
+  });
+}
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