Define equality for boolean selectors.

test/equality_test.dart

Index: test/equality_test.dart
diff --git a/test/equality_test.dart b/test/equality_test.dart
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+// 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.
+
+import 'package:test/test.dart';
+
+import 'package:boolean_selector/boolean_selector.dart';
+
+void main() {
+  test("variable", () {
+    _expectEqualsSelf("foo");
+  });
+
+  test("not", () {
+    _expectEqualsSelf("!foo");
+  });
+
+  test("or", () {
+    _expectEqualsSelf("foo || bar");
+  });
+
+  test("and", () {
+    _expectEqualsSelf("foo && bar");
+  });
+
+  test("conditional", () {
+    _expectEqualsSelf("foo ? bar : baz");
+  });
+
+  test("all", () {
+    expect(BooleanSelector.all, equals(BooleanSelector.all));
+  });
+
+  test("none", () {
+    expect(BooleanSelector.none, equals(BooleanSelector.none));
+  });
+
+  test("redundant parens don't matter", () {
+    expect(new BooleanSelector.parse("foo && (bar && baz)"),
+        equals(new BooleanSelector.parse("foo && (bar && baz)")));
+  });
+
+  test("meaningful parens do matter", () {
+    expect(new BooleanSelector.parse("(foo && bar) || baz"),
+        equals(new BooleanSelector.parse("foo && bar || baz")));
+  });
+}
+
+void _expectEqualsSelf(String selector) {
+  expect(new BooleanSelector.parse(selector),
+      equals(new BooleanSelector.parse(selector)));
+}