using System;
using UnitTestSharp;

namespace Blacklight.Core.UnitTests
{
    public class StringHostClipboardTextTests : TestFixture
    {
        public class CtorTests : TestFixture
        {
            public void NullText_Throws()
            {
                CheckThrow(typeof(ArgumentNullException));
                new StringHostClipboardText(null);
            }

            public void StartsUndisposed()
            {
                CheckFalse(new StringHostClipboardText("abc").IsDisposed);
            }
        }

        public class LengthTests : TestFixture
        {
            public void IsTheStringsLength()
            {
                CheckEqual(5, new StringHostClipboardText("hello").Length);
            }
        }

        public class GetChunkTests : TestFixture
        {
            public void ReadsFromTheStart()
            {
                var text = new StringHostClipboardText("hello");

                CheckEqual("hello", text.GetChunk(0).ToString());
            }

            public void ReadsFromAnIndexToTheEnd()
            {
                var text = new StringHostClipboardText("hello");

                CheckEqual("llo", text.GetChunk(2).ToString());
            }

            public void AStartAtTheLength_Throws()
            {
                var text = new StringHostClipboardText("hello");

                CheckThrow(typeof(ArgumentOutOfRangeException));
                text.GetChunk(5);
            }

            public void AfterDispose_Throws()
            {
                var text = new StringHostClipboardText("hello");
                text.Dispose();

                CheckThrow(typeof(ObjectDisposedException));
                text.GetChunk(0);
            }
        }

        public class DisposeTests : TestFixture
        {
            public void MarksItDisposed()
            {
                var text = new StringHostClipboardText("hello");

                text.Dispose();

                CheckTrue(text.IsDisposed);
            }

            public void DisposingTwice_IsAllowed()
            {
                var text = new StringHostClipboardText("hello");
                text.Dispose();

                text.Dispose();

                CheckTrue(text.IsDisposed);
            }
        }
    }
}