Print meaningful message when waiting for output

scalameta · Dec 4, 2019 · 6498b4b · 6498b4b
1 parent 735ac3b
commit 6498b4b
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/tests/unit/src/main/scala/scala/meta/internal/metals/debug/TestDebugger.scala b/tests/unit/src/main/scala/scala/meta/internal/metals/debug/TestDebugger.scala
@@ -9,6 +9,7 @@ import org.eclipse.lsp4j.debug.OutputEventArguments
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
 import scala.concurrent.Promise
+import scala.concurrent.TimeoutException
 import scala.meta.internal.metals.MetalsEnrichments._
 
 final class TestDebugger(connect: RemoteServer.Listener => Debugger)(
@@ -61,6 +62,11 @@ final class TestDebugger(connect: RemoteServer.Listener => Debugger)(
       output
         .awaitPrefix(Category.STDOUT, prefix)
         .withTimeout(seconds, TimeUnit.SECONDS)
+        .recoverWith {
+          case timeout: TimeoutException =>
+            val error = s"No prefix [$prefix] in [${output()}]"
+            Future.failed(new Exception(error, timeout))
+        }
     }
   }