Add test

Author: phischu

examples/benchmarks/input_output/server_client.effekt

@@ -0,0 +1,49 @@
+import io
+import io/error
+import io/network
+import io/time
+import bytearray
+
+def main() = {
+  with on[IOError].panic
+  val listener = listen("127.0.0.1", 8080, 1000);
+  spawn(box {
+    with on[IOError].panic
+    accept(listener, box { connection =>
+      with on[IOError].panic
+      println("accepted")
+      val message = "hello world"
+      var buffer = bytearray::fromString(message)
+      write(connection, buffer, 0, buffer.size())
+      close(connection)
+  })});
+
+  println("started")
+
+  val results = array::build(2) { i =>
+    promise(box {
+      with on[IOError].result
+      wait(1000)
+      val connection = connect("127.0.0.1", 8080)
+      println("connected")
+      var buffer = bytearray::allocate(4096)
+      val number = read(connection, buffer, 0, 4096)
+      close(connection)
+      println("closed " ++ number.show)
+      number
+    })
+  };
+
+  println("spawned")
+
+  var total = 0;
+  results.foreach { number =>
+    println("awaiting")
+    total = total + number.await.value
+    println("awaited")
+  };
+
+  shutdown(listener)
+  
+  println(total)
+}