separate metrics from instruments and add default instrument for metrics

1 files changed, 62 insertions, 0 deletions

diff --git a/kamon-core/src/test/scala/kamon/metric/MetricLookupSpec.scala b/kamon-core/src/test/scala/kamon/metric/MetricLookupSpec.scala
new file mode 100644
index 00000000..1d60a28f
--- /dev/null
+++ b/kamon-core/src/test/scala/kamon/metric/MetricLookupSpec.scala
@@ -0,0 +1,62 @@
+package kamon.metric
+
+import kamon.Kamon
+import org.scalatest.{Matchers, WordSpec}
+
+class MetricLookupSpec extends WordSpec with Matchers {
+
+  "the Kamon companion object" can {
+    "lookup a metric and" should {
+      "always return the same histogram metric" in {
+        val histogramOne = Kamon.histogram("histogram-lookup")
+        val histogramTwo = Kamon.histogram("histogram-lookup")
+        histogramOne shouldBe theSameInstanceAs(histogramTwo)
+      }
+
+      "always return the same counter metric" in {
+        val counterOne = Kamon.counter("counter-lookup")
+        val counterTwo = Kamon.counter("counter-lookup")
+        counterOne shouldBe theSameInstanceAs(counterTwo)
+      }
+
+      "always return the same gauge metric" in {
+        val gaugeOne = Kamon.gauge("gauge-lookup")
+        val gaugeTwo = Kamon.gauge("gauge-lookup")
+        gaugeOne shouldBe theSameInstanceAs(gaugeTwo)
+      }
+
+      "always return the same min-max-counter metric" in {
+        val minMaxCounterOne = Kamon.minMaxCounter("min-max-counter-lookup")
+        val minMaxCounterTwo = Kamon.minMaxCounter("min-max-counter-lookup")
+        minMaxCounterOne shouldBe theSameInstanceAs(minMaxCounterTwo)
+      }
+    }
+
+    "refine a metric with tags and" should {
+      "always return the same histogram for a set of tags" in {
+        val histogramOne = Kamon.histogram("histogram-lookup").refine("tag" -> "value")
+        val histogramTwo = Kamon.histogram("histogram-lookup").refine("tag" -> "value")
+        histogramOne shouldBe theSameInstanceAs(histogramTwo)
+      }
+
+      "always return the same counter for a set of tags" in {
+        val counterOne = Kamon.counter("counter-lookup").refine("tag" -> "value")
+        val counterTwo = Kamon.counter("counter-lookup").refine("tag" -> "value")
+        counterOne shouldBe theSameInstanceAs(counterTwo)
+      }
+
+      "always return the same gauge for a set of tags" in {
+        val gaugeOne = Kamon.gauge("gauge-lookup").refine("tag" -> "value")
+        val gaugeTwo = Kamon.gauge("gauge-lookup").refine("tag" -> "value")
+        gaugeOne shouldBe theSameInstanceAs(gaugeTwo)
+      }
+
+      "always return the same min-max-counter for a set of tags" in {
+        val minMaxCounterOne = Kamon.minMaxCounter("min-max-counter-lookup").refine("tag" -> "value")
+        val minMaxCounterTwo = Kamon.minMaxCounter("min-max-counter-lookup").refine("tag" -> "value")
+        minMaxCounterOne shouldBe theSameInstanceAs(minMaxCounterTwo)
+      }
+    }
+  }
+
+}