Fix Step function and add test for known optimum.

src/eva2/problems/F3Problem.java

@@ -28,7 +28,9 @@ public class F3Problem extends AbstractProblemDoubleOffset implements java.io.Se
     }
 
     /**
-     * Ths method allows you to evaluate a double[] to determine the fitness
+     * Evaluates a double vector according to the Step function.
+     *
+     * fitness = sum(floor(x_i + 0.5)^2)
      *
      * @param x The n-dimensional input vector
      * @return The m-dimensional output vector.
@@ -37,9 +39,9 @@ public class F3Problem extends AbstractProblemDoubleOffset implements java.io.Se
     public double[] evaluate(double[] x) {
         x = rotateMaybe(x);
         double[] result = new double[1];
-        result[0] = yOffset + 6 * x.length;
+        result[0] = yOffset;
         for (int i = 0; i < x.length - 1; i++) {
-            result[0] += Math.floor(x[i] - this.xOffset);
+            result[0] += Math.pow(Math.floor(x[i] + 0.5 - this.xOffset), 2);
         }
         return result;
     }

test/eva2/problems/F3ProblemTest.java

@@ -0,0 +1,24 @@
+package eva2.problems;
+
+import eva2.tools.math.Mathematics;
+import junit.framework.TestCase;
+
+public class F3ProblemTest extends TestCase {
+
+    /**
+     * The Step function has its minimum
+     * at x_{i} = 0
+     *
+     * @throws Exception
+     */
+    public void testEvaluate() throws Exception {
+        F3Problem problem = new F3Problem();
+
+        for (int i = 1; i < 100; i++) {
+            double[] x = Mathematics.zeroes(i);
+            double[] res = problem.evaluate(x);
+            assertEquals(1, res.length);
+            assertEquals(0.0, res[0]);
+        }
+    }
+}

test/eva2/tools/SerializerTest.java

@@ -68,7 +68,6 @@ public class SerializerTest {
      */
     @Test
     public void testStoreObject() {
-        System.out.println("storeObject");
         OutputStream outStream = null;
         Serializable s = null;
         Serializer.storeObject(outStream, s);
@@ -81,7 +80,6 @@ public class SerializerTest {
      */
     @Test
     public void testLoadObject_InputStream() {
-        System.out.println("loadObject");
         InputStream inputStream = null;
         Object expResult = null;
         Object result = Serializer.loadObject(inputStream);