1 files changed, 109 insertions, 0 deletions
diff --git a/kamon-core/src/test/scala/kamon/metrics/instrument/MinMaxCounterSpec.scala b/kamon-core/src/test/scala/kamon/metrics/instrument/MinMaxCounterSpec.scala
new file mode 100644
index 00000000..a309f92e
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+++ b/kamon-core/src/test/scala/kamon/metrics/instrument/MinMaxCounterSpec.scala
@@ -0,0 +1,109 @@
+package kamon.metrics.instrument
+/* =========================================================================================
+ * Copyright © 2013-2014 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.
+ * =========================================================================================
+ */
+import org.scalatest.{Matchers, WordSpecLike}
+import kamon.metrics.instruments.counter.MinMaxCounter
+
+class MinMaxCounterSpec extends WordSpecLike with Matchers {
+
+
+  "the MinMaxCounter" should {
+    "increment" in {
+      val counter = MinMaxCounter()
+
+      counter.increment()
+      counter.increment()
+      counter.increment()
+      counter.increment()
+      counter.increment()
+
+      val (_, _, sum) = counter.collect()
+
+      sum should be(5)
+    }
+
+    "decrement" in {
+      val counter = MinMaxCounter()
+      counter.increment(5L)
+
+      counter.decrement()
+      counter.decrement()
+      counter.decrement()
+      counter.decrement()
+      counter.decrement()
+
+      val (_, _, sum) = counter.collect()
+
+      sum should be(0)
+    }
+
+    "reset the min and max with the sum value when the collect method is called" in {
+      val counter = MinMaxCounter()
+
+      counter.increment(10)
+      counter.increment(20)
+      counter.increment(30)
+      counter.increment(40)
+      counter.increment(50)
+
+      counter.collect() //only for check the last value after reset min max
+
+      val (min, max, sum) = counter.collect()
+
+      min should be(sum)
+      max should be(sum)
+      sum should be(150)
+    }
+  }
+
+  "track the min value" in {
+    val counter = MinMaxCounter()
+
+    counter.increment(10)
+    counter.increment(20)
+    counter.increment(30)
+    counter.increment(40)
+    counter.increment(50)
+
+    val (min, _, _) = counter.collect()
+
+    min should be(0)
+
+    counter.increment(50)
+
+    val (minAfterCollectAndAddSomeValues, _, _) = counter.collect()
+
+    minAfterCollectAndAddSomeValues should be(150)
+  }
+
+  "track the max value" in {
+    val counter = MinMaxCounter()
+    counter.increment(10)
+    counter.increment(20)
+    counter.increment(30)
+    counter.increment(40)
+    counter.increment(50)
+
+    val (_, max, _) = counter.collect()
+
+    max should be(150)
+
+    counter.increment(200)
+
+    val (_,maxAfterCollectAndAddSomeValues, _) = counter.collect()
+
+    maxAfterCollectAndAddSomeValues should be(350)
+  }
+}