The simplest way to use an Informer is to pass a string to its apply method. Given this string, the Informer will construct a Report using the string returned by invoking nameForReport, a method defined on Informer, as the name and the string passed to apply as the message. The Informer will then pass the newly created Report to its wrapped Reporter via the infoProvided method. Here's an example of using an Informer in a Suite subclass:

 import org.scalatest._
 
 class MySuite extends Suite {
   def testAddition(info: Informer) {
     assert(1 + 1 === 2)
     info("Addition seems to work")
   }
 }
 

 scala> (new MySuite).execute()
 Test Starting - MySuite.testAddition(Reporter)
 Info Provided - MySuite.testAddition(Reporter): Addition seems to work
 Test Succeeded - MySuite.testAddition(Reporter)
 

 import org.scalatest._

 class MySuite extends Suite {
   def testAddition(info: Informer) {
     assert(1 + 1 === 2)
     val myReport =
       new Report(info.nameForReport, "Here's a stack trace", Some(new Exception), None)
     info(myReport)
   }
 }
 

 scala> (new MySuite).execute()
 Test Starting - MySuite.testAddition(Informer)
 Info Provided - MySuite.testAddition(Informer): Here's a stack trace
 java.lang.Exception
   at line3$object$$iw$$iw$$iw$MySuite.testAddition(:10)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:585)
   at org.scalatest.Suite$class.runTest(Suite.scala:1085)
   at line3$object$$iw$$iw$$iw$MySuite.runTest(:6)
   ...
   at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
 Test Succeeded - MySuite.testAddition(Informer)
 

Besides sending a stack trace, you might want to create and pass your own Report if you've defined one or more Report subclasses that are recognized and handled specially by a Reporter subclass you've defined. See the "Extensibility" section in the documentation for Report for more information.