replace auto settings for environment with actual values

1 files changed, 48 insertions, 0 deletions

diff --git a/kamon-core/src/test/scala/kamon/EnvironmentSpec.scala b/kamon-core/src/test/scala/kamon/EnvironmentSpec.scala
new file mode 100644
index 00000000..2dee46ab
--- /dev/null
+++ b/kamon-core/src/test/scala/kamon/EnvironmentSpec.scala
@@ -0,0 +1,48 @@
+package kamon
+
+import com.typesafe.config.ConfigFactory
+import org.scalatest.{Matchers, WordSpec}
+
+class EnvironmentSpec extends WordSpec with Matchers {
+  private val baseConfig = ConfigFactory.parseString(
+    """
+      |kamon.environment {
+      |  service = environment-spec
+      |  host = auto
+      |  instance = auto
+      |}
+    """.stripMargin
+  )
+
+  "the Kamon environment" should {
+    "assign a host and instance name when they are set to 'auto'" in {
+      val env = Environment.fromConfig(baseConfig)
+
+      env.host shouldNot be("auto")
+      env.instance shouldNot be("auto")
+      env.instance shouldBe s"environment-spec@${env.host}"
+    }
+
+    "use the configured host and instance, if provided" in {
+      val customConfig = ConfigFactory.parseString(
+        """
+          |kamon.environment {
+          |  host = spec-host
+          |  instance = spec-instance
+          |}
+        """.stripMargin)
+
+      val env = Environment.fromConfig(customConfig.withFallback(baseConfig))
+
+      env.host should be("spec-host")
+      env.instance should be("spec-instance")
+    }
+
+    "always return the same incarnation name" in {
+      val envOne = Environment.fromConfig(baseConfig)
+      val envTwo = Environment.fromConfig(baseConfig)
+
+      envOne.incarnation shouldBe envTwo.incarnation
+    }
+  }
+}