1 files changed, 62 insertions, 0 deletions
diff --git a/kamon-core-tests/src/test/scala/kamon/metric/LongAdderCounterSpec.scala b/kamon-core-tests/src/test/scala/kamon/metric/LongAdderCounterSpec.scala
new file mode 100644
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+++ b/kamon-core-tests/src/test/scala/kamon/metric/LongAdderCounterSpec.scala
@@ -0,0 +1,62 @@
+/* =========================================================================================
+ * 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 org.scalatest.{Matchers, WordSpec}
+
+class LongAdderCounterSpec extends WordSpec with Matchers {
+
+  "a LongAdderCounter" should {
+    "allow unit and bundled increments" in {
+      val counter = buildCounter("unit-increments")
+      counter.increment()
+      counter.increment()
+      counter.increment(40)
+
+      counter.snapshot().value shouldBe 42
+    }
+
+    "warn the user and ignore attempts to decrement the counter" in {
+      val counter = buildCounter("attempt-to-decrement")
+      counter.increment(100)
+      counter.increment(100)
+      counter.increment(100)
+
+      counter.snapshot().value shouldBe 300
+    }
+
+    "reset the internal state to zero after taking snapshots as a default behavior" in {
+      val counter = buildCounter("reset-after-snapshot")
+      counter.increment()
+      counter.increment(10)
+
+      counter.snapshot().value shouldBe 11
+      counter.snapshot().value shouldBe 0
+    }
+
+    "optionally leave the internal state unchanged" in {
+      val counter = buildCounter("reset-after-snapshot")
+      counter.increment()
+      counter.increment(10)
+
+      counter.snapshot(resetState = false).value shouldBe 11
+      counter.snapshot(resetState = false).value shouldBe 11
+    }
+  }
+
+  def buildCounter(name: String, tags: Map[String, String] = Map.empty, unit: MeasurementUnit = MeasurementUnit.none): LongAdderCounter =
+    new LongAdderCounter(name, tags, unit)
+}