public async Task GetByMinerId()
        {
            // Arrange
            var now       = new DateTime(2018, 6, 1);
            var minerId   = new Guid("56f5fb3a-4b59-417c-aae0-ace175bb7c5b");
            var snapshots = Enumerable.Range(0, 3).Select(i => new Snapshot {
                SnapshotTime = now
            }).ToList();

            _snapshotService.Setup(m => m.GetByMinerFillGapsAsync(minerId, It.IsAny <ConcretePeriod>(), It.IsAny <TimeSpan>(), CancellationToken.None))
            .ReturnsAsync(() => snapshots)
            .Verifiable();
            var controller = new SnapshotsController(_snapshotService.Object, _collectorService.Object);

            // Act
            var result = await controller.GetAsync(minerId);

            // Assert
            _snapshotService.Verify();
            Assert.That(result, Is.Not.Empty);
        }