public void Prev_WhenInfoCollectionIsEmpty_ReturnsNull()
{
IInfoCollection <ICreditInfo, Sut> sut = CreateSut();
IInfo <ICreditInfo> result = sut.Prev(_fixture.BuildCreditInfoMock().Object);
Assert.That(result, Is.Null);
}
public void Prev_WhenInfoCollectionContainsPreviousInfoElement_ReturnsPreviousInfoElement()
{
IInfoCollection <ICreditInfo, Sut> sut = CreateSut();
DateTime infoOffset = new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1);
sut.Add(_fixture.BuildCreditInfoMock(infoOffset).Object);
sut.Add(_fixture.BuildCreditInfoMock(infoOffset.AddMonths(-1)).Object);
sut.Add(_fixture.BuildCreditInfoMock(infoOffset.AddMonths(-2)).Object);
IInfo <ICreditInfo> result = sut.Prev(sut.Last());
Assert.That(result.Year == infoOffset.AddMonths(-1).Year&& result.Month == infoOffset.AddMonths(-1).Month, Is.True);
}
public void Prev_WhenInfoCollectionDoesNotContainPreviousInfoElement_ReturnsNull()
{
IInfoCollection <ICreditInfo, Sut> sut = CreateSut();
DateTime infoOffset = new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1);
sut.Add(_fixture.BuildCreditInfoMock(infoOffset).Object);
sut.Add(_fixture.BuildCreditInfoMock(infoOffset.AddMonths(-1)).Object);
sut.Add(_fixture.BuildCreditInfoMock(infoOffset.AddMonths(-2)).Object);
IInfo <ICreditInfo> result = sut.Prev(sut.First());
Assert.That(result, Is.Null);
}
public void Prev_WhenInfoIsNull_ThrowsArgumentNullException()
{
IInfoCollection <ICreditInfo, Sut> sut = CreateSut();
ArgumentNullException result = Assert.Throws <ArgumentNullException>(() => sut.Prev(null));
// ReSharper disable PossibleNullReferenceException
Assert.That(result.ParamName, Is.EqualTo("info"));
// ReSharper restore PossibleNullReferenceException
}