com.google.cloud.dataflow.sdk.testing.DataflowJUnitTestRunner.java Source code

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Here is the source code for com.google.cloud.dataflow.sdk.testing.DataflowJUnitTestRunner.java

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/*
 * Copyright (C) 2015 Google Inc.
 *
 * 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 com.google.cloud.dataflow.sdk.testing;

import com.google.cloud.dataflow.sdk.options.Description;
import com.google.cloud.dataflow.sdk.options.PipelineOptions;
import com.google.cloud.dataflow.sdk.options.PipelineOptionsFactory;
import com.google.cloud.dataflow.sdk.options.Validation;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.reflect.ClassPath;
import com.google.common.reflect.ClassPath.ClassInfo;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.annotation.Nullable;

/**
 * A test runner which can invoke a series of method or class test targets configuring
 * the {@link TestPipeline} to run against the Dataflow service based upon command-line
 * parameters specified.
 *
 * <p>Supported target definitions as command line parameters are:
 * <ul>
 *   <li>Class: "ClassName"
 *   <li>Method: "ClassName#methodName"
 * </ul>
 * Multiple parameters can be specified in sequence, which will cause the test
 * runner to invoke the tests in the specified order.
 *
 * <p>All tests will be executed after which, if any test had failed, the runner
 * will exit with a non-zero status code.
 */
public class DataflowJUnitTestRunner {
    private static final Logger LOG = LoggerFactory.getLogger(DataflowJUnitTestRunner.class);

    /**
     * Options which control a Dataflow JUnit test runner to invoke
     * a series of method and/or class targets.
     */
    @Description("Options which control a Dataflow JUnit test runner to invoke "
            + "a series of method and/or class targets.")
    public interface Options extends PipelineOptions {
        @Description("A list of supported test targets. Supported targets are 'ClassName' "
                + "or 'ClassName#MethodName'")
        @Validation.Required
        String[] getTest();

        void setTest(String[] values);
    }

    public static void main(String... args) throws Exception {
        PipelineOptionsFactory.register(Options.class);
        Options options = PipelineOptionsFactory.fromArgs(args).withValidation().as(Options.class);
        Set<ClassPath.ClassInfo> classes = ClassPath.from(ClassLoader.getSystemClassLoader()).getAllClasses();

        // Build a list of requested test targets
        List<Request> requests = new ArrayList<>();
        for (String testTarget : options.getTest()) {
            if (testTarget.contains("#")) {
                String[] parts = testTarget.split("#", 2);
                Class<?> klass = findClass(parts[0], classes);
                requests.add(Request.method(klass, parts[1]));
            } else {
                requests.add(Request.aClass(findClass(testTarget, classes)));
            }
        }

        // Set system properties required by TestPipeline so that it is able to execute tests
        // on the service.
        String dataflowPipelineOptions = new ObjectMapper().writeValueAsString(args);
        System.setProperty("runIntegrationTestOnService", "true");
        System.setProperty("dataflowOptions", dataflowPipelineOptions);

        // Run the set of tests
        boolean success = true;
        JUnitCore core = new JUnitCore();
        for (Request request : requests) {
            Result result = core.run(request);
            if (!result.wasSuccessful()) {
                for (Failure failure : result.getFailures()) {
                    LOG.error(failure.getTestHeader(), failure.getException());
                }
                success = false;
            }
        }
        if (!success) {
            throw new IllegalStateException("Tests failed, check output logs for details.");
        }
    }

    private static Class<?> findClass(final String simpleName, Set<ClassPath.ClassInfo> classes)
            throws ClassNotFoundException {
        Iterable<ClassPath.ClassInfo> matches = Iterables.filter(classes, new Predicate<ClassPath.ClassInfo>() {
            @Override
            public boolean apply(@Nullable ClassInfo input) {
                return input != null && simpleName.equals(input.getSimpleName());
            }
        });
        return Class.forName(Iterables.getOnlyElement(matches).getName());
    }
}