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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.
library observable.test.observable_test_utils;
import 'dart:async';
import 'package:observable/observable.dart';
import 'package:test/test.dart';
/// A small method to help readability. Used to cause the next "then" in a chain
/// to happen in the next microtask:
/// future.then(newMicrotask).then(...)
newMicrotask(_) => Future.value();
void expectChanges(List<ChangeRecord> actual, List<ChangeRecord> expected,
{String reason}) {
expect(actual, _EqualsMatcher(expected), reason: reason);
void expectNotChanges(List<ChangeRecord> actual, ChangeRecords expectedNot,
{String reason}) {
expect(actual, isNot(_EqualsMatcher(expectedNot)), reason: reason);
List<ListChangeRecord> getListChangeRecords(
List<ListChangeRecord> changes, int index) =>
List.from(changes.where((ListChangeRecord c) => c.indexChanged(index)));
List<PropertyChangeRecord> getPropertyChangeRecords(
List<ChangeRecord> changes, Symbol property) =>
(ChangeRecord c) => c is PropertyChangeRecord && == property));
List<Matcher> changeMatchers(List<ChangeRecord> changes) => changes
.map((r) =>
r is PropertyChangeRecord ? _PropertyChangeMatcher(r) : equals(r))
// Custom equality matcher is required, otherwise expect() infers ChangeRecords
// to be an iterable and does a deep comparison rather than use the == operator.
class _EqualsMatcher<ValueType> extends Matcher {
final ValueType _expected;
Description describe(Description description) =>
bool matches(dynamic item, Map matchState) =>
item is ChangeRecords && _expected == item;
class _PropertyChangeMatcher<ValueType> extends Matcher {
final PropertyChangeRecord<ValueType> _expected;
Description describe(Description description) =>
bool matches(dynamic other, Map matchState) =>
identical(_expected, other) ||
other is PropertyChangeRecord &&
_expected.runtimeType == other.runtimeType && == &&
_expected.oldValue == other.oldValue &&
_expected.newValue == other.newValue;