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diff --git a/test/net/sf/openrocket/file/rocksim/MassObjectHandlerTest.java b/test/net/sf/openrocket/file/rocksim/MassObjectHandlerTest.java
new file mode 100644
index 00000000..2bd30b4a
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+++ b/test/net/sf/openrocket/file/rocksim/MassObjectHandlerTest.java
@@ -0,0 +1,166 @@
+/*
+ * MassObjectHandlerTest.java
+ */
+package net.sf.openrocket.file.rocksim;
+
+import junit.framework.Test;
+import junit.framework.TestSuite;
+import net.sf.openrocket.file.simplesax.PlainTextHandler;
+import net.sf.openrocket.material.Material;
+import net.sf.openrocket.rocketcomponent.BodyTube;
+import net.sf.openrocket.rocketcomponent.MassComponent;
+import net.sf.openrocket.rocketcomponent.RocketComponent;
+import net.sf.openrocket.rocketcomponent.Stage;
+import net.sf.openrocket.rocketcomponent.NoseCone;
+import net.sf.openrocket.rocketcomponent.Transition;
+import net.sf.openrocket.aerodynamics.WarningSet;
+
+import java.util.HashMap;
+
+/**
+ * MassObjectHandler Tester.
+ *
+ */
+public class MassObjectHandlerTest extends BaseRocksimTest {
+
+    /**
+     * The class under test.
+     */
+    public static final Class classUT = MassObjectHandler.class;
+
+    /**
+     * The test class (this class).
+     */
+    public static final Class testClass = MassObjectHandlerTest.class;
+
+    /**
+     * Create a test suite of all tests within this test class.
+     *
+     * @return a suite of tests
+     */
+    public static Test suite() {
+        return new TestSuite(MassObjectHandlerTest.class);
+    }
+
+    /**
+     * Test constructor.
+     *
+     * @param name the name of the test to run.
+     */
+    public MassObjectHandlerTest(String name) {
+        super(name);
+    }
+
+    /**
+     * Setup the fixture.
+     */
+    public void setUp() throws Exception {
+        super.setUp();
+    }
+
+    /**
+     * Teardown the fixture.
+     */
+    public void tearDown() throws Exception {
+        super.tearDown();
+    }
+
+    /**
+     * Method: constructor
+     *
+     * @throws Exception thrown if something goes awry
+     */
+    public void testConstructor() throws Exception {
+
+        try {
+            new MassObjectHandler(null);
+            fail("Should have thrown IllegalArgumentException");
+        }
+        catch (IllegalArgumentException iae) {
+            //success
+        }
+
+        BodyTube tube = new BodyTube();
+        MassObjectHandler handler = new MassObjectHandler(tube);
+        MassComponent component = (MassComponent) getField(handler, "mass");
+        assertContains(component, tube.getChildren());
+    }
+
+    /**
+     * Method: openElement(String element, HashMap<String, String> attributes, WarningSet warnings)
+     *
+     * @throws Exception thrown if something goes awry
+     */
+    public void testOpenElement() throws Exception {
+        assertEquals(PlainTextHandler.INSTANCE, new MassObjectHandler(new BodyTube()).openElement(null, null, null));
+    }
+
+    /**
+     *
+     * Method: closeElement(String element, HashMap<String, String> attributes, String content, WarningSet warnings)
+     *
+     * @throws Exception  thrown if something goes awry
+     */
+    public void testCloseElement() throws Exception {
+        BodyTube tube = new BodyTube();
+        HashMap<String, String> attributes = new HashMap<String, String>();
+        WarningSet warnings = new WarningSet();
+
+        MassObjectHandler handler = new MassObjectHandler(tube);
+        MassComponent component = (MassComponent) getField(handler, "mass");
+
+        handler.closeElement("Len", attributes, "-1", warnings);
+        assertEquals(0d, component.getLength());
+        handler.closeElement("Len", attributes, "10", warnings);
+        assertEquals(10d / (MassObjectHandler.MASS_LEN_FUDGE_FACTOR * RocksimHandler.ROCKSIM_TO_OPENROCKET_LENGTH)
+                , component.getLength());
+        handler.closeElement("Len", attributes, "10.0", warnings);
+        assertEquals(10d / (MassObjectHandler.MASS_LEN_FUDGE_FACTOR * RocksimHandler.ROCKSIM_TO_OPENROCKET_LENGTH)
+                , component.getLength());
+        handler.closeElement("Len", attributes, "foo", warnings);
+        assertEquals(1, warnings.size());
+        warnings.clear();
+
+        handler.closeElement("KnownMass", attributes, "-1", warnings);
+        assertEquals(0d, component.getComponentMass());
+        handler.closeElement("KnownMass", attributes, "100", warnings);
+        assertEquals(100d / RocksimHandler.ROCKSIM_TO_OPENROCKET_MASS, component.getComponentMass());
+        handler.closeElement("KnownMass", attributes, "foo", warnings);
+        assertEquals(1, warnings.size());
+        warnings.clear();
+
+    }
+    
+    /**
+     * Method: setRelativePosition(RocketComponent.Position position)
+     *
+     * @throws Exception thrown if something goes awry
+     */
+    public void testSetRelativePosition() throws Exception {
+        BodyTube tube = new BodyTube();
+        MassObjectHandler handler = new MassObjectHandler(tube);
+        MassComponent component = (MassComponent) getField(handler, "mass");
+        handler.setRelativePosition(RocketComponent.Position.ABSOLUTE);
+        assertEquals(RocketComponent.Position.ABSOLUTE, component.getRelativePosition());
+    }
+
+    /**
+     * Method: getComponent()
+     *
+     * @throws Exception thrown if something goes awry
+     */
+    public void testGetComponent() throws Exception {
+        assertTrue(new MassObjectHandler(new BodyTube()).getComponent() instanceof MassComponent);
+    }
+
+    /**
+     * Method: getMaterialType()
+     *
+     * @throws Exception thrown if something goes awry
+     */
+    public void testGetMaterialType() throws Exception {
+        assertEquals(Material.Type.BULK, new MassObjectHandler(new BodyTube()).getMaterialType());
+    }
+
+
+}