--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ChildNodeTest.java	Tue Dec 18 15:33:55 2012 +0100
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.test;
+
+import java.util.*;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.nodes.Node.Child;
+
+/**
+ * <h3>Creating a Child Node</h3>
+ *
+ * <p>
+ * Child nodes are stored in the class of the parent node in fields that are marked with the {@link Child} annotation.
+ * Before such a field is assigned, {@link Node#adoptChild} must be called. This method automatically establishes a link
+ * from the child to the parent. The {@link Node#getParent()} method allows access to this field. Every node also
+ * provides the ability to iterate over its children using {@link Node#getChildren()}.</p>
+ *
+ * <p>A child node field must be declared private and non-final. It may only be assigned in the constructor of the parent
+ * node. For changing the structure of the tree at run time, the method {@link Node#replace(Node)} must be used (see
+ * {@link ReplaceTest}).
+ * </p>
+ *
+ * <p>
+ * The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.ChildrenNodesTest}.
+ * </p>
+ */
+public class ChildNodeTest {
+
+    @Test
+    public void test() {
+        TruffleRuntime runtime = Truffle.getRuntime();
+        TestChildNode leftChild = new TestChildNode();
+        TestChildNode rightChild = new TestChildNode();
+        TestRootNode rootNode = new TestRootNode(leftChild, rightChild);
+        Assert.assertEquals(rootNode, leftChild.getParent());
+        Assert.assertEquals(rootNode, rightChild.getParent());
+        Iterator<Node> iterator = rootNode.getChildren().iterator();
+        Assert.assertEquals(leftChild, iterator.next());
+        Assert.assertEquals(rightChild, iterator.next());
+        Assert.assertFalse(iterator.hasNext());
+        CallTarget target = runtime.createCallTarget(rootNode);
+        Object result = target.call();
+        Assert.assertEquals(42, result);
+    }
+
+    class TestRootNode extends RootNode {
+
+        @Child private TestChildNode left;
+        @Child private TestChildNode right;
+
+        public TestRootNode(TestChildNode left, TestChildNode right) {
+            this.left = adoptChild(left);
+            this.right = adoptChild(right);
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            return left.execute() + right.execute();
+        }
+    }
+
+    class TestChildNode extends Node {
+
+        public int execute() {
+            return 21;
+        }
+    }
+}