internal void BatchIDTests(BatchID id, DateTime timestamp, bool result)
{
WHEN["creating an instance with invalid Timestamp (before MinTimestamp)", ThenIsThrown <InvalidOperationException>()] = () =>
new BatchID(new DateTime(2015, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(-1));
WHEN["creating an instance with invalid Timestamp (after MaxTimestamp)", ThenIsThrown <InvalidOperationException>()] = () =>
new BatchID(new DateTime(2083, 1, 19, 3, 14, 7, DateTimeKind.Utc).AddMilliseconds(1));
WHEN["creating an instance with a local timezoned timestamp", ThenIsThrown <InvalidOperationException>()] = () =>
new BatchID(DateTime.Now);
GIVEN["a new BatchID"] = () => id = new BatchID(timestamp = DateTime.UtcNow);
THEN["its Sequence is 1"] = () => id.Sequence.Should().Be(1);
AND["its timestamp is rounded to 10ms"] = () => (id.Timestamp.Ticks % (TimeSpan.TicksPerMillisecond * 10)).Should().Be(0);
WHEN["calling TryToAdvance with same timestamp"] = () => result = id.TryToAdvance(timestamp);
THEN["it should return true"] = () => result.Should().BeTrue();
AND["its Sequence is 2"] = () => id.Sequence.Should().Be(2);
GIVEN["a BatchID with a sequence one below maximum sequence"] = () => id = BatchID.DeserializeInternal(EventID.GetTimestampDate(timestamp), 510);
WHEN["calling TryToAdvance"] = () => id.TryToAdvance(timestamp);
THEN["Sequence is max sequence"] = () => id.Sequence.Should().Be(511);
WHEN["calling TryToAdvance once more"] = () => result = id.TryToAdvance(timestamp);
THEN["it returns false"] = () => result.Should().BeFalse();
AND["Sequence is max"] = () => id.Sequence.Should().Be(511);
WHEN["calling TryToAdvance with timestamp + 10 ticks"] = () => result = id.TryToAdvance(timestamp.AddTicks(10));
THEN["it still returns false"] = () => result.Should().BeFalse();
WHEN["calling TryToAdvance with timestamp + 10ms"] = () => result = id.TryToAdvance(timestamp = timestamp.AddMilliseconds(10));
THEN["it returns true"] = () => result.Should().BeTrue();
AND["its Timestamp is set to the new timestamp"] = () => id.Timestamp.Should().Be(EventID.GetTimestampDate(timestamp));
AND["its Sequence should be 1"] = () => id.Sequence.Should().Be(1);
WHEN["calling TryToAdvance with an invalid timestamp", ThenIsThrown <InvalidOperationException>()] = () =>
id.TryToAdvance(new DateTime(2090, 1, 1));
WHEN["calling TryToAdvance with a timestamp before the current timestamp", ThenIsThrown <InvalidOperationException>()] = () =>
id.TryToAdvance(timestamp.AddMilliseconds(-10));
}