(QUITE BROKEN) Parameterized Runner for CDI-Unit

CdiUnitRunnerWithParameters.java

/*
 * Copyright 2016, Red Hat, Inc. and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
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 */
package org.zanata.test;

import java.lang.reflect.Field;
import java.util.List;

import org.jglue.cdiunit.CdiRunner;
import org.junit.runner.Runner;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.model.FrameworkField;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.parameterized.ParametersRunnerFactory;
import org.junit.runners.parameterized.TestWithParameters;

/**
 * Parameterized Runner for CDI-Unit. Based on http://stackoverflow.com/a/27750897/14379
 * @author Sean Flanigan <a href="mailto:sflaniga@redhat.com">sflaniga@redhat.com</a>
 */
public class CdiUnitRunnerWithParameters extends CdiRunner {
    private final Object[] parameters;
    private final String paramsName;

    public CdiUnitRunnerWithParameters(TestWithParameters test) throws InitializationError {
        super(test.getTestClass().getJavaClass());
        this.parameters = test.getParameters().toArray();
        this.paramsName = test.getName();
    }

    @Override
    @SuppressWarnings("unchecked")
    protected <T> T createTest(Class<T> testClass) throws Exception {
        T test = super.createTest(testClass);
        return injectParameterFields(test);
    }

    private boolean fieldsAreAnnotated() {
        return !getParameterFields().isEmpty();
    }

    private List<FrameworkField> getParameterFields() {
        return getTestClass().getAnnotatedFields(Parameter.class);
    }

    // This method is based on org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters.createTestUsingFieldInjection() (EPL 1.0)
    private <T> T injectParameterFields(T testClassInstance) throws Exception {
        List<FrameworkField> fields = getParameterFields();
        if (fields.size() != parameters.length) {
            throw new Exception(
                    "Wrong number of parameters and @Parameter fields."
                            + " @Parameter fields counted: "
                            + fields.size()
                            + ", available parameters: " + parameters.length
                            + ".");
        }
        for (FrameworkField each : fields) {
            Field field = each.getField();
            Parameter param = field.getAnnotation(Parameter.class);
            int index = param.value();
            try {
                field.setAccessible(true);
                field.set(testClassInstance, parameters[index]);
            } catch (IllegalArgumentException e) {
                throw new Exception(getTestClass().getName()
                        + ": Trying to set " + field.getName()
                        + " with the value " + parameters[index]
                        + " that is not the right type ("
                        + parameters[index].getClass().getSimpleName()
                        + " instead of " + field.getType().getSimpleName()
                        + ").", e);
            }
        }
        return testClassInstance;
    }

    @Override
    protected String testName(FrameworkMethod method) {
        return method.getName() + paramsName;
    }

    @Override
    protected void validateConstructor(List<Throwable> errors) {
        validateOnlyOneConstructor(errors);
        validateZeroArgConstructor(errors);
        // Unlike BlockJUnit4ClassRunnerWithParameters
        // we only support field injection for parameters
        // for compatibility with CDI constructor rules.
        if (!fieldsAreAnnotated()) {
            errors.add(new Exception("Runner only supports field injection for parameters"));
        }
    }

    public static class Factory implements ParametersRunnerFactory {
        @Override
        public Runner createRunnerForTestWithParameters(TestWithParameters test)
                throws InitializationError {
            return new CdiUnitRunnerWithParameters(test);
        }
    }
}

Note that this requires a patch to CDI-Unit: cdi-unit/cdi-unit#81 and JUnit 4.12.

Sorry, this approach doesn't really work. It just sets the fields of the CDI proxy for the Test object, which is useless. You need a CDI extension to inject the parameters into the actual CDI object.