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Diffstat (limited to 'kamon-core-tests/src/test/scala/kamon/metric/RangeSamplerSpec.scala')
| -rw-r--r-- | kamon-core-tests/src/test/scala/kamon/metric/RangeSamplerSpec.scala | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/kamon-core-tests/src/test/scala/kamon/metric/RangeSamplerSpec.scala b/kamon-core-tests/src/test/scala/kamon/metric/RangeSamplerSpec.scala new file mode 100644 index 00000000..3aaf57a4 --- /dev/null +++ b/kamon-core-tests/src/test/scala/kamon/metric/RangeSamplerSpec.scala @@ -0,0 +1,90 @@ +/* ========================================================================================= + * Copyright © 2013-2017 the kamon project <http://kamon.io/> + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software distributed under the + * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, + * either express or implied. See the License for the specific language governing permissions + * and limitations under the License. + * ========================================================================================= + */ + + +package kamon.metric + +import java.time.Duration + +import org.scalatest.{Matchers, WordSpec} + +case class TemporalBucket(value: Long, frequency: Long) extends Bucket + +class RangeSamplerSpec extends WordSpec with Matchers { + + "a RangeSampler" should { + "track ascending tendencies" in { + val rangeSampler = buildRangeSampler("track-ascending") + rangeSampler.increment() + rangeSampler.increment(3) + rangeSampler.increment() + + rangeSampler.sample() + + val snapshot = rangeSampler.snapshot() + + snapshot.distribution.min should be(0) + snapshot.distribution.max should be(5) + } + + "track descending tendencies" in { + val rangeSampler = buildRangeSampler("track-descending") + rangeSampler.increment(5) + rangeSampler.decrement() + rangeSampler.decrement(3) + rangeSampler.decrement() + + rangeSampler.sample() + + val snapshot = rangeSampler.snapshot() + snapshot.distribution.min should be(0) + snapshot.distribution.max should be(5) + } + + "reset the min and max to the current value after taking a snapshot" in { + val rangeSampler = buildRangeSampler("reset-range-sampler-to-current") + + rangeSampler.increment(5) + rangeSampler.decrement(3) + rangeSampler.sample() + + val firstSnapshot = rangeSampler.snapshot() + firstSnapshot.distribution.min should be(0) + firstSnapshot.distribution.max should be(5) + + rangeSampler.sample() + + val secondSnapshot = rangeSampler.snapshot() + secondSnapshot.distribution.min should be(2) + secondSnapshot.distribution.max should be(2) + } + + "report zero as the min and current values if the current value fell bellow zero" in { + val rangeSampler = buildRangeSampler("report-zero") + + rangeSampler.decrement(3) + + rangeSampler.sample() + + val snapshot = rangeSampler.snapshot() + + snapshot.distribution.min should be(0) + snapshot.distribution.max should be(0) + } + } + + def buildRangeSampler(name: String, tags: Map[String, String] = Map.empty, unit: MeasurementUnit = MeasurementUnit.none): SimpleRangeSampler = + new SimpleRangeSampler(name, tags, new AtomicHdrHistogram(name, tags, unit, dynamicRange = DynamicRange.Default), Duration.ofMillis(100)) +}
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