public void FindByDate_GivenItemsExist_ShouldReturnMatchingItems()
{
//Given
var tournamentRepository = Substitute.For <ITournamentRepository>();
var tournamentService = new TournamentService(tournamentRepository);
var tournaments = new List <Tournament>()
{
new Tournament(1, "Tournament 1", DateTime.Parse("2018/10/18"), "Location 1"),
new Tournament(2, "Tournament 2", DateTime.Parse("2019/12/25"), "Location 2"),
new Tournament(3, "Tournament 3", DateTime.Parse("2016/01/01"), "Location 3")
};
tournamentRepository.FindByDate(Arg.Any <DateTime>()).Returns(tournaments);
//When
var results = tournamentService.FindByDate(DateTime.Parse("2018/10/18"));
//Then
results.Should().BeEquivalentTo(tournaments);
}