Nuclex.Support/Source/StringHelper.Test.cs

#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2017 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.IO;

#if UNITTEST

using NUnit.Framework;

namespace Nuclex.Support {

  /// <summary>Unit Test for the string helper class</summary>
  [TestFixture]
  internal class StringHelperTest {

    /// <summary>
    ///   Verifies that the IndexNotOfAny() method works identical to the framework's
    ///   implementation of the IndexOfAny() method, only inverted.
    /// </summary>
    [Test]
    public void TestIndexNotOfAny() {
      string positive = "xxxxxOOOOO";
      string negative = "OOOOOxxxxx";

      Assert.AreEqual(
        positive.IndexOfAny(new char[] { 'O' }),
        StringHelper.IndexNotOfAny(negative, new char[] { 'O' })
      );
    }

    /// <summary>
    ///   Verifies that the IndexNotOfAny() method works identical to the framework's
    ///   implementation of the IndexOfAny() method, only inverted, using a start index.
    /// </summary>
    [Test]
    public void TestIndexNotOfAnyWithStartIndex() {
      string positive = "OOOOOxxxxxOOOOO";
      string negative = "xxxxxOOOOOxxxxx";

      Assert.AreEqual(
        positive.IndexOfAny(new char[] { 'O' }, 5),
        StringHelper.IndexNotOfAny(negative, new char[] { 'O' }, 5)
      );
    }

    /// <summary>
    ///   Verifies that the LastIndexNotOfAny() method works identical to the framework's
    ///   implementation of the LastIndexOfAny() method, only inverted.
    /// </summary>
    [Test]
    public void TestLastIndexNotOfAny() {
      string positive = "xxxxxOOOOO";
      string negative = "OOOOOxxxxx";

      Assert.AreEqual(
        positive.LastIndexOfAny(new char[] { 'x' }),
        StringHelper.LastIndexNotOfAny(negative, new char[] { 'x' })
      );
    }

    /// <summary>
    ///   Verifies that the LastIndexNotOfAny() method works identical to the framework's
    ///   implementation of the LastIndexOfAny() method, only inverted, using a start index.
    /// </summary>
    [Test]
    public void TestLastIndexNotOfAnyWithStartIndex() {
      string positive = "OOOOOxxxxxOOOOO";
      string negative = "xxxxxOOOOOxxxxx";

      Assert.AreEqual(
        positive.LastIndexOfAny(new char[] { 'x' }, 5),
        StringHelper.LastIndexNotOfAny(negative, new char[] { 'x' }, 5)
      );
    }

    /// <summary>
    ///   Verifies that the IndexNotOfAny() method works with multiple characters
    /// </summary>
    [Test]
    public void TestMultipleCharIndexNotOfAny() {
      string positive = "abcde12345";
      string negative = "12345abcde";

      Assert.AreEqual(
        positive.IndexOfAny(new char[] { '1', '2', '3', '4', '5' }),
        StringHelper.IndexNotOfAny(negative, new char[] { '1', '2', '3', '4', '5' })
      );
    }

    /// <summary>
    ///   Verifies that the IndexNotOfAny() method works with multiple characters,
    ///   using a start index
    /// </summary>
    [Test]
    public void TestMultipleCharIndexNotOfAnyWithStartIndex() {
      string positive = "12345abcde12345";
      string negative = "abcde12345abcde";

      Assert.AreEqual(
        positive.IndexOfAny(new char[] { '1', '2', '3', '4', '5' }, 5),
        StringHelper.IndexNotOfAny(negative, new char[] { '1', '2', '3', '4', '5' }, 5)
      );
    }

    /// <summary>
    ///   Verifies that the LastIndexNotOfAny() method works with multiple characters
    /// </summary>
    [Test]
    public void TestMultipleCharLastIndexNotOfAny() {
      string positive = "abcde12345";
      string negative = "12345abcde";

      Assert.AreEqual(
        positive.LastIndexOfAny(new char[] { 'a', 'b', 'c', 'd', 'e' }),
        StringHelper.LastIndexNotOfAny(negative, new char[] { 'a', 'b', 'c', 'd', 'e' })
      );
    }

    /// <summary>
    ///   Verifies that the LastIndexNotOfAny() method works with multiple characters,
    ///   using a start index
    /// </summary>
    [Test]
    public void TestMultipleCharLastIndexNotOfAnyWithStartIndex() {
      string positive = "12345abcde12345";
      string negative = "abcde12345abcde";

      Assert.AreEqual(
        positive.LastIndexOfAny(new char[] { 'a', 'b', 'c', 'd', 'e' }, 5),
        StringHelper.LastIndexNotOfAny(negative, new char[] { 'a', 'b', 'c', 'd', 'e' }, 5)
      );
    }

    /// <summary>
    ///   Verifies that the IndexNotOfAny() method fails when only matches are found
    /// </summary>
    [Test]
    public void TestIndexNotOfAnyMatchesOnly() {
      string positive = "1234512345";
      string negative = "abcdeabcde";

      Assert.AreEqual(
        positive.IndexOfAny(new char[] { 'a', 'b', 'c', 'd', 'e' }),
        StringHelper.IndexNotOfAny(negative, new char[] { 'a', 'b', 'c', 'd', 'e' })
      );
    }

    /// <summary>
    ///   Verifies that the IndexNotOfAny() method fails when only matches are found,
    ///   using a start index
    /// </summary>
    [Test]
    public void TestIndexNotOfAnyMatchesOnlyWithStartIndex() {
      string positive = "abcde1234512345";
      string negative = "12345abcdeabcde";

      Assert.AreEqual(
        positive.IndexOfAny(new char[] { 'a', 'b', 'c', 'd', 'e' }, 5),
        StringHelper.IndexNotOfAny(negative, new char[] { 'a', 'b', 'c', 'd', 'e' }, 5)
      );
    }

    /// <summary>
    ///   Verifies that the LastIndexNotOfAny() method fails when only matches are found
    /// </summary>
    [Test]
    public void TestLastIndexNotOfAnyMatchesOnly() {
      string positive = "1234512345";
      string negative = "abcdeabcde";

      Assert.AreEqual(
        positive.LastIndexOfAny(new char[] { 'a', 'b', 'c', 'd', 'e' }),
        StringHelper.LastIndexNotOfAny(negative, new char[] { 'a', 'b', 'c', 'd', 'e' })
      );
    }

    /// <summary>
    ///   Verifies that the LastIndexNotOfAny() method fails when only matches are found,
    ///   using a start index
    /// </summary>
    [Test]
    public void TestLastIndexNotOfAnyMatchesOnlyWithStartIndex() {
      string positive = "abcde1234512345";
      string negative = "12345abcdeabcde";

      Assert.AreEqual(
        positive.LastIndexOfAny(new char[] { 'a', 'b', 'c', 'd', 'e' }, 5),
        StringHelper.LastIndexNotOfAny(negative, new char[] { 'a', 'b', 'c', 'd', 'e' }, 5)
      );
    }

    // TODO: Also need unit tests for the 'length' argument
    //       to guarantee the methods stop searching at the exact character

  }

} // namespace Nuclex.Support

#endif // UNITTEST