PowerShell-PSReadLine/test/StringBuilderLinewiseExtensionsTests.cs

using System.Text;
using Microsoft.PowerShell;
using Xunit;

namespace Test
{
    public sealed class StringBuilderLinewiseExtensionsTests
    {
        [Fact]
        public void StringBuilderLinewiseExtensions_LinewiseYank_Fragment()
        {
            var buffer = new StringBuilder("line1\nline2");

            // system under test

            var range = buffer.GetRange(1, 42);

            // assert

            Assert.Equal(5, range.Offset);
            Assert.Equal(6, range.Count);
        }

        [Fact]
        public void StringBuilderLinewiseExtensions_LinewiseYank_Line()
        {
            var buffer = new StringBuilder("line1\nline2\n");

            // system under test

            var range = buffer.GetRange(1, 42);

            // assert

            Assert.Equal(5, range.Offset);
            Assert.Equal(7, range.Count);
        }

        [Fact]
        public void StringBuilderLinewiseExtensions_LinewiseYank_Lines()
        {
            var buffer = new StringBuilder("line1\nline2\nline3\nline4");

            // system under test

            var range = buffer.GetRange(1, 2);

            // assert

            Assert.Equal(5, range.Offset);
            Assert.Equal(12, range.Count);
        }
    }
}