### Question:
DecisionTree { public DecisionSet getDecisionsSet(T testObject, String propertyName) { DecisionSet decisionSet = new DecisionSet(propertyName); root.populateDecisions(testObject, decisionSet, propertyName); return decisionSet; } DecisionTree(); DecisionSet getDecisionsSet(T testObject, String propertyName); void registerConstraintType(String name, Class<? extends Constraint<T>> constraintClass); void registerPropertyName(String propertyName); void loadConstraints(String name, InputStream stream); void loadConstraints(ResourceFile file);  }### Answer:
@Test public void testMatchFromFirstXML() { Color c = Color.WHITE; DecisionSet decisionSet = decisionTree.getDecisionsSet(c, "NAME"); List<Decision> decisions = decisionSet.getDecisions(); assertEquals(1, decisions.size()); Decision decision = decisions.get(0); assertEquals("WHITE", decision.getValue()); assertEquals("Red value = 255\nBlue value = 255\nGreen value = 255\n", decision.getDescisionPathString()); assertEquals("ColorXML1", decision.getSource()); }
@Test public void testMatchFromAdditionalXML() { Color c = new Color(255, 0, 255); DecisionSet decisionSet = decisionTree.getDecisionsSet(c, "NAME"); List<Decision> decisions = decisionSet.getDecisions(); assertEquals(1, decisions.size()); Decision decision = decisions.get(0); assertEquals("PURPLE", decision.getValue()); assertEquals("Red value = 255\nBlue value = 255\nGreen value = 0\n", decision.getDescisionPathString()); assertEquals("ColorXML2", decision.getSource()); }
@Test public void testMatchMultiple() { Color c = new Color(255, 255, 0); DecisionSet decisionSet = decisionTree.getDecisionsSet(c, "NAME"); List<Decision> decisions = decisionSet.getDecisions(); assertEquals(2, decisions.size()); Decision decision = decisions.get(0); assertEquals("YELLOW", decision.getValue()); assertEquals("Red value = 255\nBlue value = 0\nGreen value = 255\n", decision.getDescisionPathString()); assertEquals("ColorXML1", decision.getSource()); decision = decisions.get(1); assertEquals("YELLOW2", decision.getValue()); assertEquals("Blue value = 0\nRed value = 255\nGreen value = 255\n", decision.getDescisionPathString()); assertEquals("ColorXML2", decision.getSource()); }
@Test public void testNoMatchUsingDefault() { Color c = new Color(100, 100, 100); DecisionSet decisionSet = decisionTree.getDecisionsSet(c, "NAME"); List<Decision> decisions = decisionSet.getDecisions(); assertEquals(1, decisions.size()); Decision decision = decisions.get(0); assertEquals("UNKNOWN", decision.getValue()); assertEquals("", decision.getDescisionPathString()); }