public async Task QueryAsync_WhenCalled_AssertGetUserIdentitiesAsyncWasCalledOnSecurityRepository()
        {
            QueryHandler sut = CreateSut();

            await sut.QueryAsync(new EmptyQuery());

            _securityRepositoryMock.Verify(m => m.GetUserIdentitiesAsync(), Times.Once);
        }
        public void QueryAsync_WhenQueryIsNull_ThrowsArgumentNullException()
        {
            QueryHandler sut = CreateSut();

            ArgumentNullException result = Assert.ThrowsAsync <ArgumentNullException>(async() => await sut.QueryAsync(null));

            Assert.That(result.ParamName, Is.EqualTo("query"));
        }
        public async Task QueryAsync_WhenCalled_ReturnsUserIdentitiesFromSecurityRepository()
        {
            IEnumerable <IUserIdentity> userIdentityCollection = _fixture.CreateMany <IUserIdentity>(_random.Next(5, 10)).ToList();
            QueryHandler sut = CreateSut(userIdentityCollection);

            IEnumerable <IUserIdentity> result = await sut.QueryAsync(new EmptyQuery());

            Assert.That(result, Is.EqualTo(userIdentityCollection));
        }