js_interop/test/set_test.dart

// Copyright (c) 2026, 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 'dart:js_interop';

import 'package:js_interop/js_interop.dart';
import 'package:test/test.dart';

void main() {
  late JSSet<JSNumber> set;
  setUp(() {
    set = JSSet([1.toJS, 2.toJS].toJS);
  });

  test('constructor with no arguments returns an empty set', () {
    final set = JSSet();
    expect(set.size, equals(0));
    expect(set.values.toDartIterable, isEmpty);
  });

  test('size returns the size of the set', () => expect(set.size, equals(2)));

  test('has returns whether the set has a value', () {
    expect(set.has(1.toJS), isTrue);
    expect(set.has(3.toJS), isFalse);
  });

  test('clear empties a set', () {
    set.clear();
    expect(set.size, equals(0));
    expect(set.values.toDartIterable, isEmpty);
  });

  group('delete', () {
    test('removes a matching element from the set', () {
      expect(set.delete(1.toJS), isTrue);
      expect(set.has(1.toJS), isFalse);
      expect(set.size, equals(1));
    });

    test('ignores a non-matching element', () {
      expect(set.delete(3.toJS), isFalse);
      expect(set.size, equals(2));
    });
  });

  test("keys and values both return the set's values", () {
    expect(set.keys.toDartIterable, equals([1.toJS, 2.toJS]));
    expect(set.values.toDartIterable, equals([1.toJS, 2.toJS]));
  });

  test('JSSet.toDart contains the expected values', () {
    final set = JSSet([1.toJS, double.nan.toJS].toJS).toDart;
    expect(set.length, equals(2));
    expect(set, contains(1.toJS));
    expect(set, contains(double.nan.toJS));
  });

  test('JSSet.toDart handles null elements', () {
    final nullableSet = JSSet<JSNumber?>([1.toJS, null].toJS).toDart;
    expect(nullableSet, equals({1.toJS, null}));
  });

  group('Set.toJS', () {
    test('contains the expected values', () {
      final set = {1.toJS, 1.5.toJS}.toJS;
      expect(set.size, equals(2));
      expect(set.has(1.toJS), isTrue);
      expect(set.has(1.5.toJS), isTrue);
    });
  });
}