public async Task SearchMonsterNamesAsync_WhenRepositoryIsEmpty_ShouldReturnEmptyListOfSearchResults()
{
// Setup
_mockMonsterRepository
.Setup(repository => repository.GetMonsters())
.ReturnsAsync(Enumerable.Empty <Monster>());
var expected = Enumerable.Empty <SearchResult>();
// Execute
var actual = await fixture.SearchMonsterNamesAsync(string.Empty);
// Verify
_mockMonsterRepository.VerifyAll();
actual.Should().BeEquivalentTo(expected);
}