1 files changed, 81 insertions, 0 deletions
diff --git a/kamon-core/src/test/scala/kamon/metrics/TickMetricSnapshotBufferSpec.scala b/kamon-core/src/test/scala/kamon/metrics/TickMetricSnapshotBufferSpec.scala
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+++ b/kamon-core/src/test/scala/kamon/metrics/TickMetricSnapshotBufferSpec.scala
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+/*
+ * =========================================================================================
+ * Copyright © 2013 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.metrics
+
+import org.scalatest.{ Matchers, WordSpecLike }
+import akka.testkit.TestKit
+import akka.actor.ActorSystem
+import scala.concurrent.duration._
+import kamon.metrics.Subscriptions.TickMetricSnapshot
+import kamon.metrics.MetricSnapshot.Measurement
+
+class TickMetricSnapshotBufferSpec extends TestKit(ActorSystem("tick-metric-snapshot-buffer")) with WordSpecLike with Matchers {
+
+  "the TickMetricSnapshotBuffer" should {
+    "merge TickMetricSnapshots received until the flush timeout is reached and fix the from/to fields" in new SnapshotFixtures {
+      val buffer = system.actorOf(TickMetricSnapshotBuffer.props(3 seconds, testActor))
+
+      buffer ! firstEmpty
+      buffer ! secondEmpty
+      buffer ! thirdEmpty
+
+      within(2 seconds)(expectNoMsg())
+      val mergedSnapshot = expectMsgType[TickMetricSnapshot]
+
+      mergedSnapshot.from should equal(1000)
+      mergedSnapshot.to should equal(4000)
+      mergedSnapshot.metrics should be('empty)
+    }
+
+    "merge empty and non-empty snapshots" in new SnapshotFixtures {
+      val buffer = system.actorOf(TickMetricSnapshotBuffer.props(3 seconds, testActor))
+
+      buffer ! firstNonEmpty
+      buffer ! secondNonEmpty
+      buffer ! thirdEmpty
+
+      within(2 seconds)(expectNoMsg())
+      val mergedSnapshot = expectMsgType[TickMetricSnapshot]
+
+      mergedSnapshot.from should equal(1000)
+      mergedSnapshot.to should equal(4000)
+      mergedSnapshot.metrics should not be ('empty)
+
+      val testMetricSnapshot = mergedSnapshot.metrics(CustomMetric("test-metric")).metrics(CustomMetric.RecordedValues)
+      testMetricSnapshot.min should equal(1)
+      testMetricSnapshot.max should equal(10)
+      testMetricSnapshot.numberOfMeasurements should equal(35)
+      testMetricSnapshot.measurements should contain allOf (Measurement(1, 10), Measurement(4, 9), Measurement(10, 16))
+
+    }
+  }
+
+  trait SnapshotFixtures {
+    val firstEmpty = TickMetricSnapshot(1000, 2000, Map.empty)
+    val secondEmpty = TickMetricSnapshot(2000, 3000, Map.empty)
+    val thirdEmpty = TickMetricSnapshot(3000, 4000, Map.empty)
+
+    val firstNonEmpty = TickMetricSnapshot(1000, 2000,
+      Map((CustomMetric("test-metric") -> SimpleGroupSnapshot(Map(CustomMetric.RecordedValues -> MetricSnapshot(20, Scale.Unit, Vector(Measurement(1, 10), Measurement(10, 10))))))))
+
+    val secondNonEmpty = TickMetricSnapshot(1000, 2000,
+      Map((CustomMetric("test-metric") -> SimpleGroupSnapshot(Map(CustomMetric.RecordedValues -> MetricSnapshot(15, Scale.Unit, Vector(Measurement(4, 9), Measurement(10, 6))))))))
+
+  }
+
+  case class SimpleGroupSnapshot(metrics: Map[MetricIdentity, MetricSnapshotLike]) extends MetricGroupSnapshot
+}