diff options
Diffstat (limited to 'kamon-core/src/test/scala/kamon/metric/instrument/CounterSpec.scala')
-rw-r--r-- | kamon-core/src/test/scala/kamon/metric/instrument/CounterSpec.scala | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kamon-core/src/test/scala/kamon/metric/instrument/CounterSpec.scala b/kamon-core/src/test/scala/kamon/metric/instrument/CounterSpec.scala new file mode 100644 index 00000000..1a93e1f6 --- /dev/null +++ b/kamon-core/src/test/scala/kamon/metric/instrument/CounterSpec.scala @@ -0,0 +1,55 @@ +package kamon.metric.instrument + +import java.nio.LongBuffer + +import kamon.metric.CollectionContext +import org.scalatest.{ Matchers, WordSpec } + +class CounterSpec extends WordSpec with Matchers { + + "a Counter" should { + "allow increment only operations" in new CounterFixture { + counter.increment() + counter.increment(10) + + intercept[UnsupportedOperationException] { + counter.increment(-10) + } + } + + "reset to zero when a snapshot is taken" in new CounterFixture { + counter.increment(100) + takeSnapshotFrom(counter).count should be(100) + takeSnapshotFrom(counter).count should be(0) + takeSnapshotFrom(counter).count should be(0) + + counter.increment(50) + takeSnapshotFrom(counter).count should be(50) + takeSnapshotFrom(counter).count should be(0) + } + + "produce a snapshot that can be merged with others" in new CounterFixture { + val counterA = Counter() + val counterB = Counter() + counterA.increment(100) + counterB.increment(200) + + val counterASnapshot = takeSnapshotFrom(counterA) + val counterBSnapshot = takeSnapshotFrom(counterB) + + counterASnapshot.merge(counterBSnapshot, collectionContext).count should be(300) + counterBSnapshot.merge(counterASnapshot, collectionContext).count should be(300) + } + + } + + trait CounterFixture { + val counter = Counter() + + val collectionContext = new CollectionContext { + val buffer: LongBuffer = LongBuffer.allocate(1) + } + + def takeSnapshotFrom(counter: Counter): Counter.Snapshot = counter.collect(collectionContext) + } +} |