From 33ee29edc7dcf580099dfc7482737129ac2bddd0 Mon Sep 17 00:00:00 2001
From: Li Haoyi <haoyi.sg@gmail.com>
Date: Tue, 31 Oct 2017 08:35:46 -0700
Subject: Sketched out structure of Scala subprojects

---
 src/test/scala/forge/TestUtil.scala | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'src/test/scala/forge/TestUtil.scala')

diff --git a/src/test/scala/forge/TestUtil.scala b/src/test/scala/forge/TestUtil.scala
index 8405c87c..9337fbe0 100644
--- a/src/test/scala/forge/TestUtil.scala
+++ b/src/test/scala/forge/TestUtil.scala
@@ -1,12 +1,28 @@
 package forge
 
-import forge.util.OSet
+import forge.util.{Args, OSet}
 import utest.assert
-
 import scala.collection.mutable
 
 object TestUtil {
+  def test(inputs: Target[Int]*) = {
+    new Test(inputs, pure = inputs.nonEmpty)
+  }
 
+  /**
+    * A dummy target that takes any number of inputs, and whose output can be
+    * controlled externally, so you can construct arbitrary dataflow graphs and
+    * test how changes propagate.
+    */
+  class Test(val inputs: Seq[Target[Int]],
+             val pure: Boolean) extends Target[Int]{
+    var counter = 0
+    def evaluate(args: Args) = {
+      counter + args.args.map(_.asInstanceOf[Int]).sum
+    }
+
+    override def sideHash = counter
+  }
   def checkTopological(targets: OSet[Target[_]]) = {
     val seen = mutable.Set.empty[Target[_]]
     for(t <- targets.items.reverseIterator){
-- 
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