diff --git a/WatchDogCore/WatchDog/META-INF/MANIFEST.MF b/WatchDogCore/WatchDog/META-INF/MANIFEST.MF
index 356b5dfd..08ac9cc0 100644
--- a/WatchDogCore/WatchDog/META-INF/MANIFEST.MF
+++ b/WatchDogCore/WatchDog/META-INF/MANIFEST.MF
@@ -16,9 +16,9 @@ Bundle-ClassPath: .,
  lib/mapdb-1.0.5.jar
 Export-Package: com.google.gson,
  com.google.gson.annotations,
- com.google.gson.reflect,
- com.google.gson.internal, 
+ com.google.gson.internal,
  com.google.gson.internal.bind,
+ com.google.gson.reflect,
  com.google.gson.stream,
  nl.tudelft.watchdog.core.logic.document,
  nl.tudelft.watchdog.core.logic.interval,
@@ -31,5 +31,6 @@ Export-Package: com.google.gson,
  nl.tudelft.watchdog.core.util,
  org.joda.time,
  org.joda.time.base,
+ org.joda.time.chrono,
  org.joda.time.format,
  org.mapdb
diff --git a/WatchDogEclipsePlugin/WatchDogUnitTests/.classpath b/WatchDogEclipsePlugin/WatchDogUnitTests/.classpath
index d5901f0b..5e19468f 100644
--- a/WatchDogEclipsePlugin/WatchDogUnitTests/.classpath
+++ b/WatchDogEclipsePlugin/WatchDogUnitTests/.classpath
@@ -13,5 +13,6 @@
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="lib" path="libs/commons-io-2.4.jar"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
+	<classpathentry exported="true" kind="lib" path="libs/equalsverifier-2.0.2.jar"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/WatchDogEclipsePlugin/WatchDogUnitTests/META-INF/MANIFEST.MF b/WatchDogEclipsePlugin/WatchDogUnitTests/META-INF/MANIFEST.MF
index 68236798..6a327a8e 100644
--- a/WatchDogEclipsePlugin/WatchDogUnitTests/META-INF/MANIFEST.MF
+++ b/WatchDogEclipsePlugin/WatchDogUnitTests/META-INF/MANIFEST.MF
@@ -13,5 +13,6 @@ Bundle-ClassPath: libs/mockito-all-1.9.5.jar,
  libs/powermock-mockito-1.6.1-full.jar,
  libs/javassist-3.18.2-GA.jar,
  libs/objenesis-2.1.jar,
- libs/cglib-nodep-2.2.2.jar
+ libs/cglib-nodep-2.2.2.jar,
+ libs/equalsverifier-2.0.2.jar
 Import-Package: org.eclipse.ui
diff --git a/WatchDogEclipsePlugin/WatchDogUnitTests/build.properties b/WatchDogEclipsePlugin/WatchDogUnitTests/build.properties
index 00b4d4c7..329298c7 100644
--- a/WatchDogEclipsePlugin/WatchDogUnitTests/build.properties
+++ b/WatchDogEclipsePlugin/WatchDogUnitTests/build.properties
@@ -7,4 +7,5 @@ bin.includes = META-INF/,\
                libs/powermock-mockito-1.6.1-full.jar,\
                libs/javassist-3.18.2-GA.jar,\
                libs/objenesis-2.1.jar,\
-               libs/cglib-nodep-2.2.2.jar
+               libs/cglib-nodep-2.2.2.jar,\
+               libs/equalsverifier-2.0.2.jar
diff --git a/WatchDogEclipsePlugin/WatchDogUnitTests/libs/equalsverifier-2.0.2.jar b/WatchDogEclipsePlugin/WatchDogUnitTests/libs/equalsverifier-2.0.2.jar
new file mode 100644
index 00000000..c737fbca
Binary files /dev/null and b/WatchDogEclipsePlugin/WatchDogUnitTests/libs/equalsverifier-2.0.2.jar differ
diff --git a/WatchDogEclipsePlugin/WatchDogUnitTests/src/nl/tudelft/watchdog/core/logic/interval/intervaltypes/IntervalBaseTest.java b/WatchDogEclipsePlugin/WatchDogUnitTests/src/nl/tudelft/watchdog/core/logic/interval/intervaltypes/IntervalBaseTest.java
new file mode 100644
index 00000000..bdb98c9c
--- /dev/null
+++ b/WatchDogEclipsePlugin/WatchDogUnitTests/src/nl/tudelft/watchdog/core/logic/interval/intervaltypes/IntervalBaseTest.java
@@ -0,0 +1,13 @@
+package nl.tudelft.watchdog.core.logic.interval.intervaltypes;
+
+import org.junit.Test;
+
+import nl.jqno.equalsverifier.EqualsVerifier;
+
+public class IntervalBaseTest {
+
+	@Test
+	public void equalsContract() {
+	    EqualsVerifier.forClass(IntervalBase.class).verify();
+	}
+}