Additional tooling for simple JUnit testing of serialization.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141038 13f79535-47bb-0310-9956-ffa450edef68

src/test/org/apache/commons/math/TestUtils.java

@@ -54,12 +54,19 @@
 
 package org.apache.commons.math;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
 import org.apache.commons.math.complex.Complex;
 
 import junit.framework.Assert;
 
 /**
- * @version $Revision: 1.7 $ $Date: 2003/11/15 18:52:31 $
+ * @version $Revision: 1.8 $ $Date: 2003/11/19 13:26:42 $
  */
 public class TestUtils {
     /**
@@ -85,4 +92,33 @@ public class TestUtils {
         assertEquals(expected.getReal(), actual.getReal(), delta);
         assertEquals(expected.getImaginary(), actual.getImaginary(), delta);
     }
+    
+    public static Object serializeAndRecover(Object o){
+        
+        Object result = null;
+        
+        File tmp = null;
+        
+        try {
+            
+            // serialize the Object
+            tmp = File.createTempFile("test",".ser");
+            FileOutputStream fo = new FileOutputStream(tmp);
+            ObjectOutputStream so = new ObjectOutputStream(fo);
+            so.writeObject(o);
+            so.flush();
+
+            // deserialize the Book
+            FileInputStream fi = new FileInputStream(tmp);
+            ObjectInputStream si = new ObjectInputStream(fi);  
+            result = si.readObject();
+            
+        }catch (Exception e) {
+            e.printStackTrace();
+        }finally{
+            if(tmp != null) tmp.delete();
+        }
+        
+        return result;
+    }
 }

src/test/org/apache/commons/math/stat/DescriptiveStatisticsTest.java

@@ -57,13 +57,14 @@ import junit.framework.Test;
 import junit.framework.TestCase;
 import junit.framework.TestSuite;
 
+import org.apache.commons.math.TestUtils;
 import org.apache.commons.math.random.RandomData;
 import org.apache.commons.math.random.RandomDataImpl;
 
 /**
  * Test cases for the {@link Univariate} class.
  *
- * @version $Revision: 1.1 $ $Date: 2003/11/15 16:01:41 $
+ * @version $Revision: 1.2 $ $Date: 2003/11/19 13:26:42 $
  */
 
 public final class DescriptiveStatisticsTest extends TestCase {
@@ -340,6 +341,31 @@ public final class DescriptiveStatisticsTest extends TestCase {
         assertTrue("empty value set should return NaN",
             Double.isNaN(u.getPercentile(50)));
     }
-                                     
+                      
+    /** test stats */
+    public void testSerialization() {
+        DescriptiveStatistics u = DescriptiveStatistics.newInstance(); 
+        assertEquals("total count",0,u.getN(),tolerance);
+        u.addValue(one);
+        u.addValue(two);
+        
+        DescriptiveStatistics u2 = (DescriptiveStatistics)TestUtils.serializeAndRecover(u); 
+ 
+        u2.addValue(two);
+        u2.addValue(three);
+        
+        assertEquals("N",n,u2.getN(),tolerance);
+        assertEquals("sum",sum,u2.getSum(),tolerance);
+        assertEquals("sumsq",sumSq,u2.getSumsq(),tolerance);
+        assertEquals("var",var,u2.getVariance(),tolerance);
+        assertEquals("std",std,u2.getStandardDeviation(),tolerance);
+        assertEquals("mean",mean,u2.getMean(),tolerance);
+        assertEquals("min",min,u2.getMin(),tolerance);
+        assertEquals("max",max,u2.getMax(),tolerance);
+
+        u2.clear();
+        assertEquals("total count",0,u2.getN(),tolerance);    
+    }       
+                                   
 }