diff -r b8edf9de56c5 -r efecc4bc0321 samples/stateful/test/org/apidesign/stateful/api/ProgressTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/stateful/test/org/apidesign/stateful/api/ProgressTest.java	Sun May 02 14:56:33 2010 +0200
@@ -0,0 +1,34 @@
+package org.apidesign.stateful.api;
+
+import junit.framework.TestCase;
+import org.apidesign.stateful.api.ProgressStateless.InProgress;
+
+public class ProgressTest extends TestCase {
+    
+    public ProgressTest(String testName) {
+        super(testName);
+    }
+
+    public void testProgressStatefulWithoutStart() {
+        try {
+            // BEGIN: progress.wrong.order
+            ProgressStateful p = ProgressStateful.create("WrongOrder");
+            p.progress(10);
+            p.finish();
+            // END: progress.wrong.order
+            
+            fail("Calling progress without start yields an exception!?");
+        } catch (IllegalStateException ex) {
+            // OK
+        }
+    }
+
+    public void testProgressStatelessNeedsStart() {
+        ProgressStateless p = ProgressStateless.create("GoodOrder");
+        InProgress progress = p.start(10);
+        // without calling start(), there is no way to call progress() method
+        progress.progress(10);
+        progress.finish();
+    }
+
+}