public void InitiateGroupingStageCommandHandler_InvalidRetroId_ThrowsNotFoundException()
        {
            // Given
            const string retroId = "not found surely :)";
            var          handler = new InitiateGroupingStageCommandHandler(this.Context, this.RetrospectiveStatusUpdateDispatcherMock);
            var          request = new InitiateGroupingStageCommand {
                RetroId = retroId
            };

            // When
            TestDelegate action = () => handler.Handle(request, CancellationToken.None).GetAwaiter().GetResult();

            // Then
            Assert.That(action, Throws.InstanceOf <NotFoundException>());
        }
        public async Task InitiateGroupingStageCommandHandler_OnStatusChange_UpdatesRetroStageAndInvokesNotification()
        {
            // Given
            var handler = new InitiateGroupingStageCommandHandler(this.Context, this.RetrospectiveStatusUpdateDispatcherMock);
            var request = new InitiateGroupingStageCommand {
                RetroId = this.RetroId
            };

            this.SystemClockMock.CurrentTimeOffset.Returns(DateTimeOffset.UnixEpoch);

            // When
            await handler.Handle(request, CancellationToken.None);

            this.RefreshObject();

            // Then
            Assert.That(this.Retrospective.CurrentStage, Is.EqualTo(RetrospectiveStage.Grouping));

            await this.RetrospectiveStatusUpdateDispatcherMock.Received().DispatchUpdate(Arg.Any <Retrospective>(), CancellationToken.None);
        }