public void Items_WhenNull_ReturnEmptyAndNotNull()
{
var dummy = BuildPageCounter.AValidOne().Please();
var sut = new PagedViewModel <int>(dummy, null);
sut.ItemsInThePage.Should().BeEmpty().And.NotBeNull();
}
public void Counter_ByDefault_ReturnsCounter(IEnumerable <int> dummy)
{
var counter = BuildPageCounter.AValidOne().Please();
var sut = new PagedViewModel <int>(counter, dummy.AsQueryable());
sut.Counter.Should().Be(counter);
}
public void PageNumber_WhenSmallerThan1_Returns1()
{
var sut = BuildPageCounter.AValidOne()
.WithPageNumber(0)
.Please();
sut.Number.Should().Be(1);
}
public void PageNumber_When0_AndPageCountIs0_Returns1()
{
var sut = BuildPageCounter.AValidOne()
.WithPageNumber(0)
.WithTotalItemCount(0)
.Please();
sut.Number.Should().Be(1);
}
public void TotalItemCount_CanBeSmallerThanSize(byte pageSize)
{
var totalItemCount = (uint)pageSize - 10;
Action act = () => BuildPageCounter.AValidOne()
.WithPageSize(pageSize)
.WithTotalItemCount(totalItemCount)
.Please();
act.Should().NotThrow <Exception>();
}
public void HasNext_WhenPageNumberIsTotalPageCount_RetunsFalse(
byte number, byte size, byte totalItemCount)
{
var sut = BuildPageCounter.AValidOne()
.WithPageNumber(number)
.WithPageSize(size)
.WithTotalItemCount(totalItemCount)
.Please();
sut.HasNext.Should().BeFalse();
}
public void PageNumber_WhenBiggerThanTotalPageCount_ReturnsTotalPageCount(
byte number, byte size, byte totalItemCount)
{
var sut = BuildPageCounter.AValidOne()
.WithPageNumber(number)
.WithPageSize(size)
.WithTotalItemCount(totalItemCount)
.Please();
sut.Number.Should().Be(sut.TotalPageCount);
}
public void TotalPageCount_Allways_ReturnsTotalPageCount(
byte pageSize, uint totalRecordCount, uint expectedTotalPageCount)
{
var sut = BuildPageCounter.AValidOne()
.WithPageSize(pageSize)
.WithTotalItemCount(totalRecordCount)
.Please();
sut.TotalPageCount.Should().Be(expectedTotalPageCount);
//TODO: refactor to property-based test:
(sut.TotalPageCount * pageSize).Should().BeCloseTo(sut.TotalItemCount, 10);
}
[Property]//Mathematical test:
public void Items_WhenSomeItemsAreIncludedInRequestedPage_ReturnsPagedItems(
PositiveInt pageNumber, PositiveInt pageSize, NonEmptyArray <int> randomArray)
{
//TODO: move this to the arbitrary generators:
var allItems = randomArray.Item.Select((item, i) => (Item: item, Index: i + 1))
.AsQueryable();
var pageCounter = BuildPageCounter.AValidOne()
.WithPageNumber((uint)pageNumber.Item)
.WithPageSize((byte)pageSize.Item)
.Please();
var sut = new PagedViewModel <(int Item, int Index)>(pageCounter, allItems);
if (sut.ItemsInThePage.Any())//TODO: remove this if statement by identifying the corresponding equivalent class arbitraries
{
var expected = (byte)((sut.ItemsInThePage.First().Index / pageCounter.Size) + 1);
pageCounter.Number.Should().Be(expected);
}
}
public void Size_ByDefault_ReturnsPageSize(byte expectedSize)
{
var result = BuildPageCounter.AValidOne().WithPageSize(expectedSize).Please();
result.Size.Should().Be(expectedSize);
}
public void Size_When0_Returns5()
{
var sut = BuildPageCounter.AValidOne().WithPageSize(0).Please();
sut.Size.Should().Be(5);
}
public void HasPrevious_WhenPageNumberIsBiggerThan1_ReturnsTrue(byte pageNumber)
{
var sut = BuildPageCounter.AValidOne().WithPageNumber(pageNumber).Please();
sut.HasPrevious.Should().BeTrue();
}
public void HasPrevious_WhenPageNumberIs1_ReturnsFalse()
{
var sut = BuildPageCounter.AValidOne().WithPageNumber(1).Please();
sut.HasPrevious.Should().BeFalse();
}