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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============================LICENSE_END===========================================
*/
package org.onap.dcae.apod.analytics.test.runner;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.InitializationError;
import org.onap.dcae.apod.analytics.test.annotation.GuiceModules;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Arrays;
/**
* A custom Junit Runner which can be used to run Guice Test with custom Test Modules
* <p>
* @author Rajiv Singla . Creation Date: 10/20/2016.
*/
public class GuiceJUnitRunner extends BlockJUnit4ClassRunner {
private static final Logger LOG = LoggerFactory.getLogger(GuiceJUnitRunner.class);
private final Injector injector;
public GuiceJUnitRunner(Class<?> klass) throws InitializationError {
super(klass);
Class<?>[] classes = getModulesFor(klass);
injector = createInjectorFor(classes);
}
/**
* Returns a new fixture for running a test. Injects Guice members
*/
@Override
public Object createTest() throws Exception {
Object obj = super.createTest();
injector.injectMembers(obj);
return obj;
}
/**
* Creates new Guice Injector and registers Guice test modules
*
* @param classes test module classes
* @return Guice injector with test modules
* @throws InitializationError
*/
private Injector createInjectorFor(Class<?>[] classes) throws InitializationError {
Module[] modules = new Module[classes.length];
for (int i = 0; i < classes.length; i++) {
try {
modules[i] = (Module) classes[i].newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new InitializationError(e);
}
}
LOG.debug("Creating Junit Test Runner with Guice Test Modules: {}", Arrays.toString(modules));
return Guice.createInjector(modules);
}
/**
* Extract user provide test modules from the {@link GuiceModules} annotation
*
* @param klass Target class which is running the test
* @return Guice modules contained passed in annotation of Guice Modules
* @throws InitializationError
*/
private Class<?>[] getModulesFor(Class<?> klass) throws InitializationError {
GuiceModules annotation = klass.getAnnotation(GuiceModules.class);
if (annotation == null) {
throw new InitializationError(
"Missing @GuiceModules annotation for unit test '" + klass.getName()
+ "'");
}
return annotation.value();
}
}
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