CircularArrayTest.cs :  » Build-Systems » CruiseControl.NET » ThoughtWorks » CruiseControl » UnitTests » Core » Logging » C# / CSharp Open Source

using System.IO;
using System.Reflection;
using NUnit.Framework;
using ThoughtWorks.CruiseControl.Core.Logging;

namespace ThoughtWorks.CruiseControl.UnitTests.Core.Logging{
  [TestFixture()]
  public class CircularArrayTest
  {
    private static readonly string TestResourceName = @"ThoughtWorks.CruiseControl.UnitTests.Core.Log.TestLog.txt";
    private CircularArray arrayStringBuffer;

    [SetUp]
    public void SetUp()
    {
      arrayStringBuffer = new CircularArray(20);
    }

    [Test]
    public void ReadZeroLines()
    {
      Assert.AreEqual(string.Empty, arrayStringBuffer.ToString(EnumeratorDirection.Backward), "Should be blank when no lines added");
      Assert.AreEqual(string.Empty, arrayStringBuffer.ToString(EnumeratorDirection.Forward), "Should be blank when no lines added");
    }

    [Test]
    public void ReadOneLine()
    {
      AddLines(1);

      string newest = arrayStringBuffer.ToString(EnumeratorDirection.Backward);
      Assert.AreEqual(CircularArrayTestResources.SingleLine, newest, "Wrong line read");
      
      string oldest = arrayStringBuffer.ToString(EnumeratorDirection.Forward);
      Assert.AreEqual(CircularArrayTestResources.SingleLine, oldest, "Wrong line read");

      Assert.AreEqual(newest, oldest, "NewestFirst and OldestFirst should be identical for single line");
    }

    [Test]
    public void ReadFiveLines()
    {
      arrayStringBuffer = new CircularArray(5);
      AddLines(5);
      Assert.AreEqual(CircularArrayTestResources.ForwardFive, arrayStringBuffer.ToString(EnumeratorDirection.Forward), "Wrong lines returned when filling array");
      Assert.AreEqual(CircularArrayTestResources.BackwardFive, arrayStringBuffer.ToString(EnumeratorDirection.Backward), "Wrong lines returned");
    }

    [Test]
    public void ReadFewerLinesThanCapacity()
    {
      arrayStringBuffer = new CircularArray(30);
      AddLines(20);
      Assert.AreEqual(CircularArrayTestResources.BackwardThirty, arrayStringBuffer.ToString(EnumeratorDirection.Backward), "Wrong lines returned when underfilling array");
      Assert.AreEqual(CircularArrayTestResources.ForwardThirty, arrayStringBuffer.ToString(EnumeratorDirection.Forward), "Wrong lines returned when underfilling array");
    }
    
    [Test]
    public void ReadMoreLinesThanCapacity()
    {
      arrayStringBuffer = new CircularArray(5);
      AddLines(20);
      Assert.AreEqual(CircularArrayTestResources.ForwardLastFive, arrayStringBuffer.ToString(EnumeratorDirection.Forward), "Wrong lines returned when overfilling array");
      Assert.AreEqual(CircularArrayTestResources.BackwardLastFive, arrayStringBuffer.ToString(EnumeratorDirection.Backward), "Wrong lines returned when overfilling array");
    }

    private void AddLines(int numberOfLines)
    {
      using (StreamReader Reader = new StreamReader(GetTestStream()))
      {
        for(int i = 0; i < numberOfLines; i++)
        {
          arrayStringBuffer.Add(Reader.ReadLine());
        }
      }
    }

    private Stream GetTestStream()
    {
      return Assembly.GetExecutingAssembly().GetManifestResourceStream(TestResourceName);
    }
  }
}