=htp add support infrastructure for folding over tuples with a binary poly-function

akka-http-tests/src/test/scala/akka/http/server/util/TupleOpsSpec.scala

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package akka.http.server.util
+
+import org.scalatest.{ Matchers, FreeSpec }
+
+class TupleOpsSpec extends FreeSpec with Matchers {
+  import TupleOps._
+
+  "The TupleOps should" - {
+
+    "support folding over tuples using a binary poly-function" - {
+
+      "example 1" in {
+        object Funky extends Poly2 {
+          implicit def step1 = at[Double, Int](_ + _)
+          implicit def step2 = at[Double, Symbol]((d, s) ⇒ (d + s.name.tail.toInt).toByte)
+          implicit def step3 = at[Byte, String]((byte, s) ⇒ byte + s.toLong)
+        }
+        (1, 'X2, "3").foldLeft(0.0)(Funky) shouldEqual 6L
+      }
+    }
+  }
+}