public void TestEmptyHistory()
{
var history = new ConsoleHistory();
history.EntryCount.Should().Be(0);
history.CurrentEntry.Should().BeNull();
history.MoveCursor(SeekOrigin.Current, 0).Should().BeTrue();
history.MoveCursor(SeekOrigin.Current, 1).Should().BeFalse();
history.MoveCursor(SeekOrigin.Current, -1).Should().BeFalse();
}
public void SingleEntry()
{
var history = new ConsoleHistory();
history.Add("Something");
history.EntryCount.Should().Be(1);
history.CurrentEntry.Should().BeNull();
history.MoveCursor(SeekOrigin.Current, 0).Should().BeTrue();
history.MoveCursor(SeekOrigin.Current, 1).Should().BeFalse();
history.MoveCursor(SeekOrigin.Current, -2).Should().BeFalse();
history.MoveCursor(SeekOrigin.Current, -1).Should().BeTrue();
history.CurrentEntry.Should().Be("Something");
}
public void MovingCursor()
{
var history = new ConsoleHistory();
history.Add("Oldest");
history.Add("Middle");
history.Add("Youngest");
history.MoveCursor(SeekOrigin.Begin, 0);
history.CurrentEntry.Should().Be("Oldest");
history.MoveCursor(SeekOrigin.Begin, 1);
history.CurrentEntry.Should().Be("Middle");
history.MoveCursor(SeekOrigin.End, 0);
history.CurrentEntry.Should().BeNull();
history.MoveCursor(SeekOrigin.End, -1);
history.CurrentEntry.Should().Be("Youngest");
history.MoveCursor(SeekOrigin.End, -2);
history.CurrentEntry.Should().Be("Middle");
history.MoveCursor(SeekOrigin.End, -3);
history.CurrentEntry.Should().Be("Oldest");
history.MoveCursor(1);
history.CurrentEntry.Should().Be("Middle");
Action bogusMovement = () => history.MoveCursor((SeekOrigin)0x10, 0);
bogusMovement.ShouldThrow <ArgumentOutOfRangeException>();
}
public void MultipleEntries()
{
var history = new ConsoleHistory();
history.Add("Older");
history.Add("Newer");
history.EntryCount.Should().Be(2);
history.CurrentEntry.Should().BeNull();
history.MoveCursor(SeekOrigin.Current, -1).Should().BeTrue();
history.CurrentEntry.Should().Be("Newer");
history.MoveCursor(SeekOrigin.Current, -1).Should().BeTrue();
history.CurrentEntry.Should().Be("Older");
history.MoveCursor(SeekOrigin.Current, 1).Should().BeTrue();
history.CurrentEntry.Should().Be("Newer");
history.MoveCursor(SeekOrigin.Current, 1).Should().BeTrue();
history.MoveCursor(SeekOrigin.Current, -2).Should().BeTrue();
history.CurrentEntry.Should().Be("Older");
}