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packages/collection/test/equality_test.dart

+// Copyright (c) 2013, 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 equality utilities.
+
+import "dart:collection";
+import "package:collection/collection.dart";
+import "package:test/test.dart";
+
+main() {
+  o(id) => new Element(id);
+
+  // Lists that are point-wise equal, but not identical.
+  var list1 = [o(1), o(2), o(3), o(4), o(5)];
+  var list2 = [o(1), o(2), o(3), o(4), o(5)];
+  // Similar length list with equal elements in different order.
+  var list3 = [o(1), o(3), o(5), o(4), o(2)];
+
+  test("IterableEquality - List", () {
+    expect(const IterableEquality().equals(list1, list2), isTrue);
+    Equality iterId = const IterableEquality(const IdentityEquality());
+    expect(iterId.equals(list1, list2), isFalse);
+  });
+
+  test("IterableEquality - LinkedSet", () {
+    var l1 = new LinkedHashSet.from(list1);
+    var l2 = new LinkedHashSet.from(list2);
+    expect(const IterableEquality().equals(l1, l2), isTrue);
+    Equality iterId = const IterableEquality(const IdentityEquality());
+    expect(iterId.equals(l1, l2), isFalse);
+  });
+
+  test("ListEquality", () {
+    expect(const ListEquality().equals(list1, list2),
+           isTrue);
+    Equality listId = const ListEquality(const IdentityEquality());
+    expect(listId.equals(list1, list2), isFalse);
+  });
+
+  test("ListInequality length", () {
+    var list4 = [o(1), o(2), o(3), o(4), o(5), o(6)];
+    expect(const ListEquality().equals(list1, list4),
+           isFalse);
+    expect(const ListEquality(const IdentityEquality()).equals(list1, list4),
+           isFalse);
+  });
+
+  test("ListInequality value", () {
+    var list5 = [o(1), o(2), o(3), o(4), o(6)];
+    expect(const ListEquality().equals(list1, list5),
+           isFalse);
+    expect(const ListEquality(const IdentityEquality()).equals(list1, list5),
+           isFalse);
+  });
+
+  test("UnorderedIterableEquality", () {
+    expect(const UnorderedIterableEquality().equals(list1, list3),
+           isTrue);
+    Equality uniterId =
+        const UnorderedIterableEquality(const IdentityEquality());
+    expect(uniterId.equals(list1, list3), isFalse);
+  });
+
+  test("UnorderedIterableInequality length", () {
+    var list6 = [o(1), o(3), o(5), o(4), o(2), o(1)];
+    expect(const UnorderedIterableEquality().equals(list1, list6),
+           isFalse);
+    expect(const UnorderedIterableEquality(const IdentityEquality())
+               .equals(list1, list6),
+           isFalse);
+  });
+
+  test("UnorderedIterableInequality values", () {
+    var list7 = [o(1), o(3), o(5), o(4), o(6)];
+    expect(const UnorderedIterableEquality().equals(list1, list7),
+           isFalse);
+    expect(const UnorderedIterableEquality(const IdentityEquality())
+               .equals(list1, list7),
+           isFalse);
+  });
+
+  test("SetEquality", () {
+    var set1 = new HashSet.from(list1);
+    var set2 = new LinkedHashSet.from(list3);
+    expect(const SetEquality().equals(set1, set2), isTrue);
+    Equality setId = const SetEquality(const IdentityEquality());
+    expect(setId.equals(set1, set2), isFalse);
+  });
+
+  test("SetInequality length", () {
+    var list8 = [o(1), o(3), o(5), o(4), o(2), o(6)];
+    var set1 = new HashSet.from(list1);
+    var set2 = new LinkedHashSet.from(list8);
+    expect(const SetEquality().equals(set1, set2),
+           isFalse);
+    expect(const SetEquality(const IdentityEquality()).equals(set1, set2),
+           isFalse);
+  });
+
+  test("SetInequality value", () {
+    var list7 = [o(1), o(3), o(5), o(4), o(6)];
+    var set1 = new HashSet.from(list1);
+    var set2 = new LinkedHashSet.from(list7);
+    expect(const SetEquality().equals(set1, set2),
+           isFalse);
+    expect(const SetEquality(const IdentityEquality()).equals(set1, set2),
+           isFalse);
+  });
+
+  var map1a = {"x": [o(1), o(2), o(3)], "y": [true, false, null]};
+  var map1b = {"x": [o(4), o(5), o(6)], "y": [false, true, null]};
+  var map2a = {"x": [o(3), o(2), o(1)], "y": [false, true, null]};
+  var map2b = {"x": [o(6), o(5), o(4)], "y": [null, false, true]};
+  var l1 = [map1a, map1b];
+  var l2 = [map2a, map2b];
+  var s1 = new Set.from(l1);
+  var s2 = new Set.from([map2b, map2a]);
+
+  test("RecursiveEquality", () {
+    const unordered = const UnorderedIterableEquality();
+    expect(unordered.equals(map1a["x"], map2a["x"]),
+        isTrue);
+    expect(unordered.equals(map1a["y"], map2a["y"]),
+        isTrue);
+    expect(unordered.equals(map1b["x"], map2b["x"]),
+        isTrue);
+    expect(unordered.equals(map1b["y"], map2b["y"]),
+        isTrue);
+    const mapval = const MapEquality(values: unordered);
+    expect(
+        mapval.equals(map1a, map2a),
+        isTrue);
+    expect(mapval.equals(map1b, map2b),
+        isTrue);
+    const listmapval = const ListEquality(mapval);
+    expect(listmapval.equals(l1, l2),
+        isTrue);
+    const setmapval = const SetEquality(mapval);
+    expect(setmapval.equals(s1, s2),
+        isTrue);
+  });
+
+  test("DeepEquality", () {
+    var colleq = const DeepCollectionEquality.unordered();
+    expect(colleq.equals(map1a["x"], map2a["x"]),
+        isTrue);
+    expect(colleq.equals(map1a["y"], map2a["y"]),
+        isTrue);
+    expect(colleq.equals(map1b["x"], map2b["x"]),
+        isTrue);
+    expect(colleq.equals(map1b["y"], map2b["y"]),
+        isTrue);
+    expect(colleq.equals(map1a, map2a),
+        isTrue);
+    expect(colleq.equals(map1b, map2b),
+        isTrue);
+    expect(colleq.equals(l1, l2),
+        isTrue);
+    expect(colleq.equals(s1, s2),
+        isTrue);
+  });
+}
+
+/// Wrapper objects for an `id` value.
+///
+/// Compares the `id` value by equality and for comparison.
+/// Allows creating simple objects that are equal without being identical.
+class Element implements Comparable<Element> {
+  final Comparable id;
+  const Element(this.id);
+  int get hashCode => id.hashCode;
+  bool operator==(Object other) => other is Element && id == other.id;
+  int compareTo(other) => id.compareTo(other.id);
+}