protected override void Arrange()
            {
                _edfiOdsInstanceIdentificationProvider = Stub <IEdFiOdsInstanceIdentificationProvider>();
                _usiValueMapper = Stub <IUniqueIdToUsiValueMapper>();

                _suppliedUsiValueMap = new PersonIdentifiersValueMap
                {
                    UniqueId = Guid.NewGuid()
                               .ToString(),
                    Usi = 10,
                    Id  = Guid.NewGuid() // Id is also provided by the USI value mapper
                };

                A.CallTo(() => _usiValueMapper.GetUniqueId(A <string> ._, A <int> ._))
                .Returns(_suppliedUsiValueMap);

                _personIdentifiersProvider = Stub <IPersonIdentifiersProvider>();

                A.CallTo(() => _personIdentifiersProvider.GetAllPersonIdentifiers(A <string> ._))
                .Returns(Task.Run(() => (IEnumerable <PersonIdentifiersValueMap>) new PersonIdentifiersValueMap[0]));

                SetupCaching();

                void SetupCaching()
                {
                    var memorycacheoption = A.Fake <IOptions <MemoryCacheOptions> >();

                    MemoryCache memoryCache = new MemoryCache(memorycacheoption);

                    _memoryCacheProvider = new MemoryCacheProvider(memoryCache);

                    _usiCache = new PersonUniqueIdToUsiCache(
                        _memoryCacheProvider,
                        _edfiOdsInstanceIdentificationProvider,
                        _usiValueMapper,
                        _personIdentifiersProvider,
                        TimeSpan.Zero,
                        TimeSpan.Zero,
                        synchronousInitialization: true);

                    PersonUniqueIdToUsiCache.GetCache = () => _usiCache;
                }
            }
            protected override void Arrange()
            {
                _edfiOdsInstanceIdentificationProvider = Stub <IEdFiOdsInstanceIdentificationProvider>();
                _idValueMapper             = Stub <IUniqueIdToIdValueMapper>();
                _usiValueMapper            = Stub <IUniqueIdToUsiValueMapper>();
                _personIdentifiersProvider = Stub <IPersonIdentifiersProvider>();

                _suppliedUsiValueMap = new PersonIdentifiersValueMap
                {
                    UniqueId = Guid.NewGuid()
                               .ToString(),
                    Usi = 10,
                    Id  = Guid.NewGuid() // Id is also provided by the USI value mapper
                };

                _suppliedPersonIdentifiers = new List <PersonIdentifiersValueMap>
                {
                    new PersonIdentifiersValueMap
                    {
                        UniqueId = Guid.NewGuid()
                                   .ToString(),
                        Usi = 100,
                        Id  = Guid.NewGuid()
                    },
                    new PersonIdentifiersValueMap
                    {
                        UniqueId = Guid.NewGuid()
                                   .ToString(),
                        Usi = 101,
                        Id  = Guid.NewGuid()
                    }
                };

                A.CallTo(() => _idValueMapper.GetId(A <string> ._, A <string> ._))
                .Returns(new PersonIdentifiersValueMap());

                A.CallTo(() => _usiValueMapper.GetUsi(A <string> ._, A <string> ._))
                .Returns(_suppliedUsiValueMap);

                A.CallTo(() => _personIdentifiersProvider.GetAllPersonIdentifiers(A <string> ._))
                .Returns(Task.Run(() => (IEnumerable <PersonIdentifiersValueMap>)_suppliedPersonIdentifiers));

                SetupCaching();

                void SetupCaching()
                {
                    _memoryCacheProvider = new MemoryCacheProvider {
                        MemoryCache = new MemoryCache(IsolatedForUnitTest)
                    };

                    _idCache = new PersonUniqueIdToIdCache(
                        _memoryCacheProvider,
                        _edfiOdsInstanceIdentificationProvider,
                        _idValueMapper);

                    _usiCache = new PersonUniqueIdToUsiCache(
                        _memoryCacheProvider,
                        _edfiOdsInstanceIdentificationProvider,
                        _usiValueMapper,
                        _personIdentifiersProvider,
                        TimeSpan.Zero,
                        TimeSpan.Zero,
                        synchronousInitialization: true);

                    PersonUniqueIdToUsiCache.GetCache = () => _usiCache;
                }
            }
            protected override void Arrange()
            {
                _edfiOdsInstanceIdentificationProvider = Stub <IEdFiOdsInstanceIdentificationProvider>();
                _idValueMapper             = Stub <IUniqueIdToIdValueMapper>();
                _usiValueMapper            = Stub <IUniqueIdToUsiValueMapper>();
                _personIdentifiersProvider = Stub <IPersonIdentifiersProvider>();

                // usi value mapper
                _suppliedUsiValueMap = new PersonIdentifiersValueMap
                {
                    UniqueId = Guid.NewGuid()
                               .ToString(),
                    Usi = 10
                };

                A.CallTo(() => _usiValueMapper.GetUsi(A <string> ._, A <string> ._))
                .Returns(_suppliedUsiValueMap);

                // id value mapper
                _suppliedIdValueMap = new PersonIdentifiersValueMap
                {
                    UniqueId = _suppliedUsiValueMap.UniqueId, // Same uniqueId
                    Id       = Guid.NewGuid()
                };

                A.CallTo(() => _idValueMapper.GetId(A <string> ._, A <string> ._))
                .Returns(_suppliedIdValueMap);

                _suppliedPersonIdentifiersValueMap = new PersonIdentifiersValueMap
                {
                    UniqueId = Guid.NewGuid()
                               .ToString(),
                    Usi = 100
                };

                A.CallTo(() => _personIdentifiersProvider.GetAllPersonIdentifiers(A <string> ._))
                .Returns(
                    Task.Run(
                        () =>
                {
                    //Force slight delay during initialization to mimic real behavior.
                    Thread.Sleep(10);

                    return
                    ((IEnumerable <PersonIdentifiersValueMap>) new[] { _suppliedPersonIdentifiersValueMap });
                }
                        ));

                SetupCaching();

                void SetupCaching()
                {
                    _memoryCacheProvider = new MemoryCacheProvider {
                        MemoryCache = new MemoryCache(IsolatedForUnitTest)
                    };

                    _idCache = new PersonUniqueIdToIdCache(
                        _memoryCacheProvider, _edfiOdsInstanceIdentificationProvider, _idValueMapper);

                    _usiCache = new PersonUniqueIdToUsiCache(
                        _memoryCacheProvider, _edfiOdsInstanceIdentificationProvider, _usiValueMapper, _personIdentifiersProvider,
                        TimeSpan.Zero, TimeSpan.Zero,
                        synchronousInitialization: false);
                }
            }