java.lang.AssertionError: assertion failed: timeout (300 milliseconds) during expectMsg while waiting for STARTED

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java.lang.AssertionError: assertion failed: timeout (300 milliseconds) during expectMsg while waiting for STARTED
at scala.Predef$.assert(Predef.scala:170)
at akka.testkit.TestKitBase$class.expectMsg_internal(TestKit.scala:387)
at akka.testkit.TestKitBase$class.expectMsg(TestKit.scala:373)
at akka.testkit.TestKit.expectMsg(TestKit.scala:814)
at akka.pattern.BackoffOnRestartSupervisorSpec$$anonfun$1$$anonfun$apply$mcV$sp$5$$anon$2$$anonfun$3$$anonfun$apply$mcV$sp$6.apply(BackoffOnRestartSupervisorSpec.scala:90)
at akka.testkit.TestKitBase$class.within(TestKit.scala:345)
at akka.testkit.TestKit.within(TestKit.scala:814)
at akka.pattern.BackoffOnRestartSupervisorSpec$$anonfun$1$$anonfun$apply$mcV$sp$5$$anon$2$$anonfun$3.apply$mcV$sp(BackoffOnRestartSupervisorSpec.scala:87)
at akka.pattern.BackoffOnRestartSupervisorSpec$$anonfun$1$$anonfun$apply$mcV$sp$5$$anon$2$$anonfun$3.apply(BackoffOnRestartSupervisorSpec.scala:85)
at akka.testkit.EventFilter.intercept(TestEventListener.scala:111)
at akka.pattern.BackoffOnRestartSupervisorSpec$$anonfun$1$$anonfun$apply$mcV$sp$5$$anon$2.(BackoffOnRestartSupervisorSpec.scala:85)

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