public void Filter_Given_null_Throws_NotEnoughEngineersException()
{
//arrange
var sut = new ChooseTwoRandomEngineersFilter();
//act and assert
Assert.Throws <NotEnoughEngineersException>(() => sut.Filter(null));
}
public void Filter_Given_LessThanTwoEngineers_Throws_NotEnoughEngineersException(int engineersNumber)
{
//arrange
var engineers = new SupportEngineerMocksBuilder()
.WithEngineersWhoDidntHadShiftYesterday(engineersNumber)
.Build();
var sut = new ChooseTwoRandomEngineersFilter();
//act and assert
Assert.Throws <NotEnoughEngineersException>(() => sut.Filter(engineers));
}
public void Filter_Given_MoreThanOneEngineer_Returns_TwoRandomEngineers()
{
//arrange
var engineers = new SupportEngineerMocksBuilder()
.WithEngineersWhoDidntHadShiftYesterday(2)
.Build();
var sut = new ChooseTwoRandomEngineersFilter();
//act
var chosenOnes = sut.Filter(engineers);
//assert
engineers.ShouldContain(chosenOnes.First());
engineers.ShouldContain(chosenOnes.Last());
}
public void Filter_Given_MoreThanTwoEngineersAndSuccessor_Calls_Successor()
{
//arrange
var engineers = new SupportEngineerMocksBuilder()
.WithEngineersWhoHadShiftYesterday(10)
.Build();
var successor = A.Fake <ISupportEngineersFilterChain>();
var sut = new ChooseTwoRandomEngineersFilter(successor);
//act
var result = sut.Filter(engineers);
//assert
A.CallTo(() => successor.Filter(A <IEnumerable <ISupportEngineer> > ._))
.MustHaveHappened(Repeated.Exactly.Once);
}
