Begin using compiled code examples in the docs. See #781

akka-docs/scala/code/StmDocSpec.scala

@@ -0,0 +1,27 @@
+package akka.docs.stm
+
+import org.scalatest.WordSpec
+import org.scalatest.matchers.MustMatchers
+
+class StmDocSpec extends WordSpec with MustMatchers {
+
+  "simple counter example" in {
+    //#simple
+    import akka.stm._
+
+    val ref = Ref(0)
+
+    def counter = atomic {
+      ref alter (_ + 1)
+    }
+
+    counter
+    // -> 1
+
+    counter
+    // -> 2
+    //#simple
+
+    ref.get must be === 2
+  }
+}