move code to src/test

* so that it compiles and tests pass
* fix some additional snip references in getting started

akka-docs/src/test/java/jdocs/actor/GraduallyBuiltActor.java

@@ -0,0 +1,39 @@
+/**
+ * Copyright (C) 2009-2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+
+package jdocs.actor;
+
+//#imports
+import akka.actor.AbstractActor;
+import akka.event.Logging;
+import akka.event.LoggingAdapter;
+import akka.japi.pf.ReceiveBuilder;
+
+//#imports
+
+//#actor
+public class GraduallyBuiltActor extends AbstractActor {
+  private final LoggingAdapter log = Logging.getLogger(getContext().getSystem(), this);
+
+  @Override
+  public Receive createReceive() {
+    ReceiveBuilder builder = ReceiveBuilder.create();
+    
+    builder.match(String.class, s -> {
+      log.info("Received String message: {}", s);
+      //#actor
+      //#reply
+      getSender().tell(s, getSelf());
+      //#reply
+      //#actor
+    });
+    
+    // do some other stuff in between
+    
+    builder.matchAny(o -> log.info("received unknown message"));
+    
+    return builder.build();
+  }
+}
+//#actor