!str #16039 Remove old scaladsl, rename scaladsl2

* and impl2, testkit2
* keeping io2 for now

akka-stream-tests/src/test/scala/akka/stream/scaladsl/SourceSpec.scala

@@ -0,0 +1,73 @@
+/**
+ * Copyright (C) 2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+package akka.stream.scaladsl
+
+import scala.concurrent.duration._
+import scala.util.control.NoStackTrace
+
+import akka.stream.FlowMaterializer
+import akka.stream.testkit.AkkaSpec
+import akka.stream.testkit.StreamTestKit
+
+class SourceSpec extends AkkaSpec {
+
+  implicit val materializer = FlowMaterializer()
+
+  "Singleton Source" must {
+    "produce element" in {
+      val p = Source.singleton(1).runWith(Sink.publisher)
+      val c = StreamTestKit.SubscriberProbe[Int]()
+      p.subscribe(c)
+      val sub = c.expectSubscription()
+      sub.request(1)
+      c.expectNext(1)
+      c.expectComplete()
+    }
+
+    "produce elements to later subscriber" in {
+      val p = Source.singleton(1).runWith(Sink.publisher)
+      val c1 = StreamTestKit.SubscriberProbe[Int]()
+      val c2 = StreamTestKit.SubscriberProbe[Int]()
+      p.subscribe(c1)
+
+      val sub1 = c1.expectSubscription()
+      sub1.request(1)
+      c1.expectNext(1)
+      c1.expectComplete()
+      p.subscribe(c2)
+      val sub2 = c2.expectSubscription()
+      sub2.request(3)
+      c2.expectNext(1)
+      c2.expectComplete()
+    }
+
+  }
+
+  "Empty Source" must {
+    "complete immediately" in {
+      val p = Source.empty.runWith(Sink.publisher)
+      val c = StreamTestKit.SubscriberProbe[Int]()
+      p.subscribe(c)
+      c.expectComplete()
+
+      val c2 = StreamTestKit.SubscriberProbe[Int]()
+      p.subscribe(c2)
+      c2.expectComplete()
+    }
+  }
+
+  "Failed Source" must {
+    "emit error immediately" in {
+      val ex = new RuntimeException with NoStackTrace
+      val p = Source.failed(ex).runWith(Sink.publisher)
+      val c = StreamTestKit.SubscriberProbe[Int]()
+      p.subscribe(c)
+      c.expectError(ex)
+
+      val c2 = StreamTestKit.SubscriberProbe[Int]()
+      p.subscribe(c2)
+      c2.expectError(ex)
+    }
+  }
+}