#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2009 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion

using System;
using System.Collections;
using System.Collections.Generic;

#if UNITTEST

using NUnit.Framework;

namespace Nuclex.Support.Collections {

  /// <summary>Unit Test for the read only collection wrapper</summary>
  [TestFixture]
  public class ReadOnlyCollectionTest {

    /// <summary>
    ///   Verifies that the copy constructor of the read only collection works
    /// </summary>
    [Test]
    public void TestCopyConstructor() {
      int[] integers = new int[] { 12, 34, 56, 78 };
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(integers);

      CollectionAssert.AreEqual(integers, testCollection);
    }

    /// <summary>Verifies that the IsReadOnly property returns true</summary>
    [Test]
    public void TestIsReadOnly() {
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(new int[0]);

      Assert.IsTrue(testCollection.IsReadOnly);
    }

    /// <summary>
    ///   Verifies that the CopyTo() of the read only collection works
    /// </summary>
    [Test]
    public void TestCopyToArray() {
      int[] inputIntegers = new int[] { 12, 34, 56, 78 };
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(inputIntegers);

      int[] outputIntegers = new int[testCollection.Count];
      testCollection.CopyTo(outputIntegers, 0);

      CollectionAssert.AreEqual(inputIntegers, outputIntegers);
    }

    /// <summary>
    ///   Checks whether the Contains() method of the read only collection is able to
    ///   determine if the collection contains an item
    /// </summary>
    [Test]
    public void TestContains() {
      int[] integers = new int[] { 1234, 6789 };
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(integers);

      Assert.IsTrue(testCollection.Contains(1234));
      Assert.IsFalse(testCollection.Contains(4321));
    }

    /// <summary>
    ///   Ensures that the Add() method of the read only collection throws an exception
    /// </summary>
    [Test]
    public void TestThrowOnAdd() {
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(new int[0]);
      Assert.Throws<NotSupportedException>(
        delegate() { (testCollection as ICollection<int>).Add(123); }
      );
    }

    /// <summary>
    ///   Ensures that the Remove() method of the read only collection throws an exception
    /// </summary>
    [Test]
    public void TestThrowOnRemove() {
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(new int[0]);
      Assert.Throws<NotSupportedException>(
        delegate() { (testCollection as ICollection<int>).Remove(123); }
      );
    }

    /// <summary>
    ///   Ensures that the Clear() method of the read only collection throws an exception
    /// </summary>
    [Test]
    public void TestThrowOnClear() {
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(new int[0]);
      Assert.Throws<NotSupportedException>(
        delegate() { (testCollection as ICollection<int>).Clear(); }
      );
    }

    /// <summary>
    ///   Tests whether the typesafe enumerator of the read only collection is working
    /// </summary>
    [Test]
    public void TestTypesafeEnumerator() {
      int[] inputIntegers = new int[] { 12, 34, 56, 78 };
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(inputIntegers);

      List<int> outputIntegers = new List<int>();
      foreach(int value in testCollection) {
        outputIntegers.Add(value);
      }

      CollectionAssert.AreEqual(inputIntegers, outputIntegers);
    }

    /// <summary>
    ///   Verifies that the CopyTo() of the read only collection works if invoked via
    ///   the ICollection interface
    /// </summary>
    [Test]
    public void TestCopyToArrayViaICollection() {
      int[] inputIntegers = new int[] { 12, 34, 56, 78 };
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(inputIntegers);

      int[] outputIntegers = new int[testCollection.Count];
      (testCollection as ICollection).CopyTo(outputIntegers, 0);

      CollectionAssert.AreEqual(inputIntegers, outputIntegers);
    }

    /// <summary>
    ///   Verifies that the IsSynchronized property and the SyncRoot property are working
    /// </summary>
    [Test]
    public void TestSynchronization() {
      ReadOnlyCollection<int> testCollection = new ReadOnlyCollection<int>(new int[0]);

      if(!(testCollection as ICollection).IsSynchronized) {
        lock((testCollection as ICollection).SyncRoot) {
          Assert.AreEqual(0, testCollection.Count);
        }
      }
    }

  }

} // namespace Nuclex.Support.Collections

#endif // UNITTEST