public void Can_repeat()
{
//arrange
var history = new HistoryBuffer <string>();
string currentItem = null, previousItem = null;
history.HistoryRepeated += delegate(object sender, HistoryEventArgs <string> args)
{
args.TryGetCurrentItem(out currentItem);
args.TryGetPreviousItem(out previousItem);
};
//act
history.RememberNew("first item");
history.RememberNew("second item");
history.Undo();
history.Repeat();
//assert
currentItem.Should().Be("second item");
previousItem.Should().Be("first item");
history.CurrentItem.Should().Be("second item");
history.Count.Should().Be(2);
}
public void Can_overflow_limited_history()
{
//arrange
var history = new HistoryBuffer <string>(maxSize: 2);
string currentItem = null, previousItem = null;
history.HistoryOverflowed += delegate(object sender, HistoryEventArgs <string> args)
{
args.TryGetCurrentItem(out currentItem);
args.TryGetPreviousItem(out previousItem);
};
//act
history.RememberNew("first item");
history.RememberNew("second item");
history.RememberNew("third item");
//assert
currentItem.Should().Be("third item");
previousItem.Should().Be("second item");
history.GetAll().ToArray().Should().BeEquivalentTo(new[]
{
"second item", "third item"
});
}
public void Should_remove_obsolete_items_after_adding_new_one()
{
//arrange
var history = new HistoryBuffer <string>();
//act
history.RememberNew("first item");
history.RememberNew("second item");
history.Undo();
history.RememberNew("third item");
//assert
history.CurrentItem.Should().Be("third item");
history.Count.Should().Be(2);
}
public void Can_forget_current_item()
{
//arrange
var history = new HistoryBuffer <string>();
string forgottenItem = null;
history.CurrentItemForgotten += delegate(object sender, HistoryEventArgs <string> args)
{
args.TryGetPreviousItem(out forgottenItem);
};
//act
history.RememberNew("new item");
history.ForgetCurrent();
//assert
forgottenItem.Should().Be("new item");
Action getCurrentItem = () =>
{
var currentItem = history.CurrentItem;
};
getCurrentItem.ShouldThrow <HistoryIsEmptyException>();
history.Count.Should().Be(0);
}
public void Can_clear_history()
{
//arrange
var history = new HistoryBuffer <string>(maxSize: 2);
//act
history.RememberNew("first item");
history.RememberNew("second item");
history.RememberNew("third item");
history.Clear();
//assert
history.Count.Should().Be(0);
history.GetAll().ToArray().Should().BeEmpty();
}
public void Can_remember_new_item()
{
//arrange
var history = new HistoryBuffer <string>();
string rememberedItem = null;
history.NewItemRemembered += delegate(object sender, HistoryEventArgs <string> args)
{
args.TryGetCurrentItem(out rememberedItem);
};
//act
history.RememberNew("new item");
//assert
rememberedItem.Should().Be("new item");
history.CurrentItem.Should().Be("new item");
history.Count.Should().Be(1);
}