Replace the old InvokerHealth with the actor based one (#1865)

diff --git a/tests/build.gradle b/tests/build.gradle
index 8eb1e4a..8d6baf7 100644
--- a/tests/build.gradle
+++ b/tests/build.gradle
@@ -45,6 +45,7 @@
     compile 'org.scalatest:scalatest_2.11:3.0.1'
     compile 'io.spray:spray-testkit_2.11:1.3.3'
     compile 'com.google.code.gson:gson:2.3.1'
+    compile 'org.scalamock:scalamock-scalatest-support_2.11:3.4.2'
 
     compile project(':common:scala')
     compile project(':core:controller')