private void setupMockServer(HashMap<String, String> override_map) { HashMap<String, String> map = new HashMap<>(Util.RESPONSE_MAP); if (override_map != null) { for (String key : override_map.keySet()) { map.put(key, override_map.get(key)); } } Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation(); AndroidApplication app = (AndroidApplication) instrumentation.getTargetContext().getApplicationContext(); // setup objectGraph to inject Mock API List modules = Collections.singletonList(new DummyAPIModule(map)); ObjectGraph graph = ObjectGraph.create(modules.toArray()); app.setObjectGraph(graph); app.getObjectGraph().inject(app); }