=docs #18012 complete remaining TODO sections in scala HTTP docs

akka-docs-dev/rst/scala/code/docs/http/scaladsl/UnmarshalSpec.scala

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package docs.http.scaladsl
+
+import akka.stream.testkit.AkkaSpec
+
+class UnmarshalSpec extends AkkaSpec {
+
+  "use unmarshal" in {
+    import akka.http.scaladsl.unmarshalling.Unmarshal
+    import system.dispatcher
+
+    import scala.concurrent.Await
+    import scala.concurrent.duration._ // ExecutionContext
+
+    val intFuture = Unmarshal("42").to[Int]
+    val int = Await.result(intFuture, 1.second) // don't block in non-test code!
+    int shouldEqual 42
+
+    val boolFuture = Unmarshal("off").to[Boolean]
+    val bool = Await.result(boolFuture, 1.second) // don't block in non-test code!
+    bool shouldBe false
+  }
+
+}