public async Task GetRightCount_ReturnMustRightSize(int size, int index)
{
var cur = CreateCursor(size);
await cur.MoveAsync(index);
var right = Math.Max(0, size - index - 1);
Assert.AreEqual(right, DataCursorExtensions.RightCount(cur));
}
public void GivenNullValue_MustThrowException()
{
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.IsEnd <object>(null));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.IsFirst <object>(null));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.IsInRange <object>(null, 0));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.MoveFirstAsync <object>(null));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.MoveLastAsync <object>(null));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.MoveNextAsync <object>(null));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.MovePrevAsync <object>(null));
Assert.ThrowsException <ArgumentNullException>(() => DataCursorExtensions.RightCount <object>(null));
}