add test case for act-1712

modules/activiti-engine/src/test/java/org/activiti/engine/test/bpmn/event/signal/SignalEventTest.java

@@ -352,4 +352,22 @@ public class SignalEventTest extends PluggableActivitiTestCase {
 	    assertEquals(0, runtimeService.createProcessInstanceQuery().count());
 	    assertEquals(0, managementService.createJobQuery().count()); 
   }
+  
+  @Deployment
+  public void testSignalUserTask() {
+    ProcessInstance pi = runtimeService.startProcessInstanceByKey("catchSignal");
+    Execution execution = runtimeService.createExecutionQuery()
+            .processInstanceId(pi.getId())
+            .activityId("waitState")
+            .singleResult();
+    assertNotNull(execution);
+    runtimeService.signal(execution.getId());
+    
+    execution = runtimeService.createExecutionQuery()
+            .processInstanceId(pi.getId())
+            .activityId("waitState")
+            .singleResult();
+    assertNotNull(execution);
+  }
+
 }

modules/activiti-engine/src/test/resources/org/activiti/engine/test/bpmn/event/signal/SignalEventTest.testSignalUserTask.bpmn20.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<definitions id="definitions"
+	xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+	xmlns:activiti="http://activiti.org/bpmn" 
+	targetNamespace="Examples">
+
+
+	<process id="catchSignal">
+
+		<startEvent id="start" />
+		<sequenceFlow sourceRef="start" targetRef="waitState" />
+
+<!--
+		<receiveTask id="waitState" name="wait" />
+-->
+ 	 <userTask id="waitState" name="Test User Task" >
+          </userTask>
+                
+
+		<sequenceFlow sourceRef="waitState" targetRef="end" />
+
+
+		<endEvent id="end" />
+
+	</process>
+
+	
+
+</definitions>