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POMocking logger in Play! 2 Framework
 

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    <p>I have a Play! 2 application (Scala) and there I have some classes that need to perform logging when they get errors.</p> <p>I would like to be able to unit test that these logging actions actually take place in the right conditions. To do so, I need to be able to mock the logger, but I am getting some issues with Mockito. What I have (simplified) looks like</p> <pre><code>import play.api.{ Logger, LoggerLike } trait BaseService { val log: LoggerLike def fail(reason: String) { log.error(reason) } } object Service extends BaseService { val log = Logger } </code></pre> <p>and then in the tests</p> <pre><code>import org.specs2.mutable._ import org.specs2.mock._ import services.BaseService object Service extends BaseService with Mockito { val log = mock[play.api.Logger] def verify(key: String) = { there was one(log).error(key) } } class ServiceSpec extends Specification { "failures should be logged" in { Service.fail("foo") Service.verify("foo") } } </code></pre> <p>But I get the error</p> <pre><code>[error] NullPointerException: null (Logger.scala:43) [error] play.api.LoggerLike$class.isErrorEnabled(Logger.scala:43) [error] play.api.Logger.isErrorEnabled(Logger.scala:147) [error] play.api.LoggerLike$class.error(Logger.scala:127) [error] play.api.Logger.error(Logger.scala:147) [error] services.BaseService$class.fail(Service.scala:19) [error] Service$.fail(ServiceSpec.scala:11) ... </code></pre> <p>I tried adding</p> <pre><code>log.isErrorEnabled returns true log.error(any[String]) returns {} </code></pre> <p>but then even the initialization of Service fails.</p>
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