Use a mock ResourceReferenceFactory instead of returning null

weld-ee-embedded-1.1/src/main/java/org/jboss/arquillian/container/weld/ee/embedded_1_1/mock/MockEjbInjectionServices.java

@@ -37,6 +37,6 @@ public void cleanup() {}
 
    @Override
    public ResourceReferenceFactory<Object> registerEjbInjectionPoint(InjectionPoint injectionPoint) {
-      return null;
+      return MockResourceReferenceFactory.instance();
    }
 }

weld-ee-embedded-1.1/src/main/java/org/jboss/arquillian/container/weld/ee/embedded_1_1/mock/MockJpaInjectionServices.java

@@ -40,11 +40,11 @@ public void cleanup() {}
 
    @Override
    public ResourceReferenceFactory<EntityManager> registerPersistenceContextInjectionPoint(InjectionPoint injectionPoint) {
-      return null;
+      return MockResourceReferenceFactory.instance();
    }
 
    @Override
    public ResourceReferenceFactory<EntityManagerFactory> registerPersistenceUnitInjectionPoint(InjectionPoint injectionPoint) {
-      return null;
+      return MockResourceReferenceFactory.instance();
    }
 }

weld-ee-embedded-1.1/src/main/java/org/jboss/arquillian/container/weld/ee/embedded_1_1/mock/MockResourceInjectionServices.java

@@ -42,11 +42,11 @@ public void cleanup() {}
 
    @Override
    public ResourceReferenceFactory<Object> registerResourceInjectionPoint(InjectionPoint injectionPoint) {
-      return null;
+      return MockResourceReferenceFactory.instance();
    }
 
    @Override
    public ResourceReferenceFactory<Object> registerResourceInjectionPoint(String jndiName, String mappedName) {
-      return null;
+      return MockResourceReferenceFactory.instance();
    }
 }

weld-ee-embedded-1.1/src/main/java/org/jboss/arquillian/container/weld/ee/embedded_1_1/mock/MockResourceReferenceFactory.java

@@ -0,0 +1,42 @@
+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2015, Red Hat, Inc., and individual contributors
+ * by the @authors tag. See the copyright.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jboss.arquillian.container.weld.ee.embedded_1_1.mock;
+
+import org.jboss.weld.injection.spi.ResourceReference;
+import org.jboss.weld.injection.spi.ResourceReferenceFactory;
+
+public class MockResourceReferenceFactory implements ResourceReferenceFactory<Object>
+{
+
+   @SuppressWarnings("unchecked")
+   public static <T> ResourceReferenceFactory<T> instance() {
+      return (ResourceReferenceFactory<T>) INSTANCE;
+   }
+
+   private static final MockResourceReferenceFactory INSTANCE = new MockResourceReferenceFactory();
+
+   private MockResourceReferenceFactory()
+   {
+   }
+
+   @Override
+   public ResourceReference<Object> createResource()
+   {
+      return null;
+   }
+
+}