diff --git a/build.gradle b/build.gradle
index 6e2b004c..ab5696d0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -285,7 +285,7 @@ task jacocoRootReport(type: org.gradle.testing.jacoco.tasks.JacocoReport) {
     }
     afterEvaluate {
         classDirectories = files(classDirectories.files.collect {
-            fileTree(dir: it, exclude: ['ptolemy/**', 'org/opt4j/tutorial/**'])
+            fileTree(dir: it, exclude: ['ptolemy/**', 'org/opt4j/tutorial/**', 'org/opt4j/viewer/**', 'org/opt4j/core/config/visualization/**'])
         })
     }
 }
diff --git a/opt4j-core/src/test/java/org/opt4j/core/ObjectiveTest.java b/opt4j-core/src/test/java/org/opt4j/core/ObjectiveTest.java
new file mode 100644
index 00000000..d16789d4
--- /dev/null
+++ b/opt4j-core/src/test/java/org/opt4j/core/ObjectiveTest.java
@@ -0,0 +1,70 @@
+package org.opt4j.core;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.opt4j.core.Objective.Sign;
+
+public class ObjectiveTest {
+
+	@Test
+	public void getSignTest() {
+		Objective o = new Objective("obj", Sign.MAX);
+		Assert.assertEquals(Sign.MAX, o.getSign());
+	}
+
+	@Test
+	public void getNameTest() {
+		Objective o = new Objective("obj", Sign.MAX);
+		Assert.assertEquals("obj", o.getName());
+	}
+
+	@Test
+	public void equalsTest() {
+		Objective o1 = new Objective("obj1", Sign.MAX);
+		Objective o11 = new Objective("obj1", Sign.MAX);
+		Objective o2 = new Objective("obj2", Sign.MAX);
+		Objective o3 = new Objective("obj1", Sign.MIN);
+		Objective o4 = new Objective(null, Sign.MAX);
+		Objective o5 = new Objective(null, Sign.MAX);
+
+		Assert.assertEquals(o1, o1);
+		Assert.assertEquals(o1, o11);
+		Assert.assertEquals(o4, o5);
+		Assert.assertNotEquals(o1, null);
+		Assert.assertNotEquals(o1, "something else");
+		Assert.assertNotEquals(o1, o2);
+		Assert.assertNotEquals(o1, o3);
+		Assert.assertNotEquals(o4, o3);
+	}
+
+	@Test
+	public void hashCodeTest() {
+		String name = "obj1";
+		Objective o1 = new Objective(name, Sign.MAX);
+		Objective o2 = new Objective(name, Sign.MAX);
+		Objective o3 = new Objective(null, Sign.MAX);
+		Objective o4 = new Objective(name, null);
+
+		Assert.assertEquals(o1.hashCode(), o2.hashCode());
+		Assert.assertNotEquals(o1.hashCode(), o3.hashCode());
+		Assert.assertNotEquals(o1.hashCode(), o4.hashCode());
+	}
+
+	@Test
+	public void compareToTest() {
+		Objective o1 = new Objective("obj1", Sign.MAX);
+		Objective o11 = new Objective("obj1", Sign.MAX);
+		Objective o2 = new Objective("obj2", Sign.MAX);
+
+		Assert.assertEquals(0, o1.compareTo(o11));
+		Assert.assertEquals(-1 * o1.compareTo(o2), o2.compareTo(o1));
+		Assert.assertEquals(1, o1.compareTo(null));
+	}
+
+	@Test
+	public void toStringTest() {
+		Objective o = new Objective("obj", Sign.MAX);
+		Assert.assertEquals("obj(MAX)", o.toString());
+	}
+
+}