#region Apache License 2.0
/*
Nuclex .NET Framework
Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#endregion // Apache License 2.0

#if !NO_SETS

#if UNITTEST

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

using NUnit.Framework;
using NMock;

namespace Nuclex.Support.Collections {

  /// <summary>Unit Test for the observable set wrapper</summary>
  [TestFixture]
  internal class ReadOnlySetTest {

    /// <summary>Called before each test is run</summary>
    [SetUp]
    public void Setup() {
      this.set = new HashSet<int>();
      this.readOnlySet = new ReadOnlySet<int>(this.set);
    }

    /// <summary>
    ///   Verifies that the observable set has a default constructor
    /// </summary>
    [Test]
    public void HasDefaultConstructor() {
      Assert.IsNotNull(new ReadOnlySet<int>(new HashSet<int>()));
    }

    /// <summary>
    ///   Verifies that an exception is thrown upon any attempt to add items
    ///   to a read-only set
    /// </summary>
    [Test]
    public void AddingThrowsException() {
      Assert.Throws<NotSupportedException>(
        delegate() { ((ISet<int>)this.readOnlySet).Add(123); }
      );
    }

    /// <summary>
    ///   Verifies that an exception is thrown upon any attempt to remove items
    ///   from a read-only set
    /// </summary>
    [Test]
    public void RemovingThrowsException() {
      Assert.Throws<NotSupportedException>(
        delegate() { ((ISet<int>)this.readOnlySet).Remove(123); }
      );
    }

    /// <summary>
    ///   Verifies that an exception is thrown upon any attempt to except
    ///   the set with another set
    /// </summary>
    [Test]
    public void ExceptingThrowsException() {
      Assert.Throws<NotSupportedException>(
        delegate() { ((ISet<int>)this.readOnlySet).ExceptWith(null); }
      );
    }

    /// <summary>
    ///   Verifies that an exception is thrown upon any attempt to intersect
    ///   the set with another set
    /// </summary>
    [Test]
    public void InsersectThrowsException() {
      Assert.Throws<NotSupportedException>(
        delegate() { ((ISet<int>)this.readOnlySet).IntersectWith(null); }
      );
    }

    /// <summary>
    ///   Verifies that it's possible to determine whether a set is a proper subset
    ///   or superset of another set
    /// </summary>
    [Test]
    public void CanDetermineProperSubsetAndSuperset() {
      this.set.Add(1);
      this.set.Add(2);
      this.set.Add(3);

      var set2 = new HashSet<int>() { 1, 3 };

      Assert.IsTrue(this.readOnlySet.IsProperSupersetOf(set2));
      Assert.IsTrue(set2.IsProperSubsetOf(this.readOnlySet));

      set2.Add(2);

      Assert.IsFalse(this.readOnlySet.IsProperSupersetOf(set2));
      Assert.IsFalse(set2.IsProperSubsetOf(this.readOnlySet));
    }

    /// <summary>
    ///   Verifies that it's possible to determine whether a set is a subset
    ///   or a superset of another set
    /// </summary>
    [Test]
    public void CanDetermineSubsetAndSuperset() {
      this.set.Add(1);
      this.set.Add(2);
      this.set.Add(3);

      var set2 = new HashSet<int>() { 1, 2, 3 };

      Assert.IsTrue(this.readOnlySet.IsSupersetOf(set2));
      Assert.IsTrue(set2.IsSubsetOf(this.readOnlySet));

      set2.Add(4);

      Assert.IsFalse(this.readOnlySet.IsSupersetOf(set2));
      Assert.IsFalse(set2.IsSubsetOf(this.readOnlySet));
    }

    /// <summary>
    ///   Verifies that a set can determine if another set overlaps with it
    /// </summary>
    [Test]
    public void CanDetermineOverlap() {
      this.set.Add(1);
      this.set.Add(3);
      this.set.Add(5);

      var set2 = new HashSet<int>() { 3 };

      Assert.IsTrue(this.readOnlySet.Overlaps(set2));
      Assert.IsTrue(set2.Overlaps(this.readOnlySet));
    }

    /// <summary>
    ///   Verifies that a set can determine if another set contains the same elements
    /// </summary>
    [Test]
    public void CanDetermineSetEquality() {
      this.set.Add(1);
      this.set.Add(3);
      this.set.Add(5);

      var set2 = new HashSet<int>() { 3, 1, 5 };

      Assert.IsTrue(this.readOnlySet.SetEquals(set2));
      Assert.IsTrue(set2.SetEquals(this.readOnlySet));

      this.set.Add(7);

      Assert.IsFalse(this.readOnlySet.SetEquals(set2));
      Assert.IsFalse(set2.SetEquals(this.readOnlySet));
    }

    /// <summary>
    ///   Verifies that any attempt to symmetrically except a read-only set
    ///   causes an exception
    /// </summary>
    [Test]
    public void SymmetricallyExceptingThrowsException() {
      Assert.Throws<NotSupportedException>(
        delegate() { ((ISet<int>)this.readOnlySet).SymmetricExceptWith(null); }
      );
    }

    /// <summary>
    ///   Verifies that any attempt to union a read-only set causes an exception
    /// </summary>
    [Test]
    public void UnioningThrowsException() {
      Assert.Throws<NotSupportedException>(
        delegate() { ((ISet<int>)this.readOnlySet).UnionWith(null); }
      );
    }

    /// <summary>Set being wrapped in a read-only set</summary>
    private ISet<int> set;
    /// <summary>Read-only wrapper around the set</summary>
    private ReadOnlySet<int> readOnlySet;

  }

} // namespace Nuclex.Support.Collections

#endif // UNITTEST

#endif // !NO_SETS