--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/gov/nasa/jpf/util/event/TestEventTree.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2014, United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The Java Pathfinder core (jpf-core) platform is licensed under the
+ * Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0. 
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+
+package gov.nasa.jpf.util.event;
+
+/**
+ * EventTree that can check traces and coverage against expected traces
+ * for testing purposes.
+ * 
+ * This has little purpose except of keeping tree spec and expected traces
+ * together in the same native class, so that we can check paths ad hoc
+ * from regression tests without having to create expected path strings
+ * in the JPF part of the test, only to translate them into native strings
+ */
+public class TestEventTree extends EventTree {
+  
+  protected String[] expected; // to be optionally initialized by subclasses
+  
+  public TestEventTree (){
+    // nothing here
+  }
+  
+  public TestEventTree (Event root){
+    super(root);
+  } 
+  
+  @Override
+  public boolean checkPath (Event lastEvent) {
+    if (expected != null){
+      return checkPath( lastEvent, expected);
+    } else {
+      System.err.println("warning: trying to check path of " + this + " without 'expected' specification");
+      return true; // nothing to check
+    }
+  }
+
+  @Override
+  public boolean isCompletelyCovered (){
+    if (expected != null){
+      return isCompletelyCovered(expected);
+    } else {
+      System.err.println("warning: trying to check coverage of " + this + " without 'expected' specification");
+      return true;
+    }
+  }
+  
+  public boolean isCompletelyCovered (String[] expected) {
+    for (int i = 0; i < expected.length; i++) {
+      if (expected[i] != null) {
+        // no checkPath() call for this one
+        return false;
+      }
+    }
+
+    return true; // no un-visited expected trace left
+  }
+
+  public float getPathCoverage (String[] expected) {
+    int n = 0;
+
+    for (int i = 0; i < expected.length; i++) {
+      if (expected[i] == null) {
+        n++;
+      }
+    }
+
+    return (float) n / expected.length;
+  }
+}