KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use Computer class of org.junit.runner package

Best junit code snippet using org.junit.runner.Computer

Source:JUnitCore.java

...50     * @param computer Helps construct Runners from classes51     * @param classes Classes in which to find tests52     * @return a {@link Result} describing the details of the test run and the failed tests.53     */54    public static Result runClasses(Computer computer, Class<?>... classes) {55        return new JUnitCore().run(computer, classes);56    }57    /**58     * Run the tests contained in <code>classes</code>. Write feedback while the tests59     * are running and write stack traces for all failed tests after all tests complete. This is60     * similar to {@link #main(String[])}, but intended to be used programmatically.61     *62     * @param classes Classes in which to find tests63     * @return a {@link Result} describing the details of the test run and the failed tests.64     */65    public static Result runClasses(Class<?>... classes) {66        return new JUnitCore().run(defaultComputer(), classes);67    }68    /**69     * @param system70     * @args args from main()71     */72    private Result runMain(JUnitSystem system, String... args) {73        system.out().println("JUnit version " + Version.id());74        List<Class<?>> classes = new ArrayList<Class<?>>();75        List<Failure> missingClasses = new ArrayList<Failure>();76        for (String each : args) {77            try {78                classes.add(Class.forName(each));79            } catch (ClassNotFoundException e) {80                system.out().println("Could not find class: " + each);81                Description description = Description.createSuiteDescription(each);82                Failure failure = new Failure(description, e);83                missingClasses.add(failure);84            }85        }86        RunListener listener = new TextListener(system);87        addListener(listener);88        Result result = run(classes.toArray(new Class[0]));89        for (Failure each : missingClasses) {90            result.getFailures().add(each);91        }92        return result;93    }94    /**95     * @return the version number of this release96     */97    public String getVersion() {98        return Version.id();99    }100    /**101     * Run all the tests in <code>classes</code>.102     *103     * @param classes the classes containing tests104     * @return a {@link Result} describing the details of the test run and the failed tests.105     */106    public Result run(Class<?>... classes) {107        return run(Request.classes(defaultComputer(), classes));108    }109    /**110     * Run all the tests in <code>classes</code>.111     *112     * @param computer Helps construct Runners from classes113     * @param classes the classes containing tests114     * @return a {@link Result} describing the details of the test run and the failed tests.115     */116    public Result run(Computer computer, Class<?>... classes) {117        return run(Request.classes(computer, classes));118    }119    /**120     * Run all the tests contained in <code>request</code>.121     *122     * @param request the request describing tests123     * @return a {@link Result} describing the details of the test run and the failed tests.124     */125    public Result run(Request request) {126        return run(request.getRunner());127    }128    /**129     * Run all the tests contained in JUnit 3.8.x <code>test</code>. Here for backward compatibility.130     *131     * @param test the old-style test132     * @return a {@link Result} describing the details of the test run and the failed tests.133     */134    public Result run(junit.framework.Test test) {135        return run(new JUnit38ClassRunner(test));136    }137    /**138     * Do not use. Testing purposes only.139     */140    public Result run(Runner runner) {141        Result result = new Result();142        RunListener listener = result.createListener();143        fNotifier.addFirstListener(listener);144        try {145            fNotifier.fireTestRunStarted(runner.getDescription());146            runner.run(fNotifier);147            fNotifier.fireTestRunFinished(result);148        } finally {149            removeListener(listener);150        }151        return result;152    }153    /**154     * Add a listener to be notified as the tests run.155     *156     * @param listener the listener to add157     * @see org.junit.runner.notification.RunListener158     */159    public void addListener(RunListener listener) {160        fNotifier.addListener(listener);161    }162    /**163     * Remove a listener.164     *165     * @param listener the listener to remove166     */167    public void removeListener(RunListener listener) {168        fNotifier.removeListener(listener);169    }170    static Computer defaultComputer() {171        return new Computer();172    }173}...

Source:File_11973.java

...41     * @param classes Classes in which to find tests42     * @return a {@link Result} describing the details of the test run and the failed tests.43     */44    public static Result runClasses(Class<?>... classes) {45        return runClasses(defaultComputer(), classes);46    }47    /**48     * Run the tests contained in <code>classes</code>. Write feedback while the tests49     * are running and write stack traces for all failed tests after all tests complete. This is50     * similar to {@link #main(String[])}, but intended to be used programmatically.51     *52     * @param computer Helps construct Runners from classes53     * @param classes  Classes in which to find tests54     * @return a {@link Result} describing the details of the test run and the failed tests.55     */56    public static Result runClasses(Computer computer, Class<?>... classes) {57        return new JUnitCore().run(computer, classes);58    }59    /**60     * @param system61     * @param args from main()62     */63    Result runMain(JUnitSystem system, String... args) {64        system.out().println("JUnit version " + Version.id());65        JUnitCommandLineParseResult jUnitCommandLineParseResult = JUnitCommandLineParseResult.parse(args);66        RunListener listener = new TextListener(system);67        addListener(listener);68        return run(jUnitCommandLineParseResult.createRequest(defaultComputer()));69    }70    /**71     * @return the version number of this release72     */73    public String getVersion() {74        return Version.id();75    }76    /**77     * Run all the tests in <code>classes</code>.78     *79     * @param classes the classes containing tests80     * @return a {@link Result} describing the details of the test run and the failed tests.81     */82    public Result run(Class<?>... classes) {83        return run(defaultComputer(), classes);84    }85    /**86     * Run all the tests in <code>classes</code>.87     *88     * @param computer Helps construct Runners from classes89     * @param classes the classes containing tests90     * @return a {@link Result} describing the details of the test run and the failed tests.91     */92    public Result run(Computer computer, Class<?>... classes) {93        return run(Request.classes(computer, classes));94    }95    /**96     * Run all the tests contained in <code>request</code>.97     *98     * @param request the request describing tests99     * @return a {@link Result} describing the details of the test run and the failed tests.100     */101    public Result run(Request request) {102        return run(request.getRunner());103    }104    /**105     * Run all the tests contained in JUnit 3.8.x <code>test</code>. Here for backward compatibility.106     *107     * @param test the old-style test108     * @return a {@link Result} describing the details of the test run and the failed tests.109     */110    public Result run(junit.framework.Test test) {111        return run(new JUnit38ClassRunner(test));112    }113    /**114     * Do not use. Testing purposes only.115     */116    public Result run(Runner runner) {117        Result result = new Result();118        RunListener listener = result.createListener();119        notifier.addFirstListener(listener);120        try {121            notifier.fireTestRunStarted(runner.getDescription());122            runner.run(notifier);123            notifier.fireTestRunFinished(result);124        } finally {125            removeListener(listener);126        }127        return result;128    }129    /**130     * Add a listener to be notified as the tests run.131     *132     * @param listener the listener to add133     * @see org.junit.runner.notification.RunListener134     */135    public void addListener(RunListener listener) {136        notifier.addListener(listener);137    }138    /**139     * Remove a listener.140     *141     * @param listener the listener to remove142     */143    public void removeListener(RunListener listener) {144        notifier.removeListener(listener);145    }146    static Computer defaultComputer() {147        return new Computer();148    }149}...

Source:JUnitCoreWrapper.java

...18 * under the License.19 */20import java.util.List;21import org.apache.maven.surefire.common.junit4.JUnit4RunListener;22import org.apache.maven.surefire.junitcore.pc.ParallelComputer;23import org.apache.maven.surefire.testset.TestSetFailedException;24import org.apache.maven.surefire.util.TestsToRun;25import org.junit.runner.Computer;26import org.junit.runner.JUnitCore;27import org.junit.runner.Request;28import org.junit.runner.Result;29import org.junit.runner.Runner;30import org.junit.runner.manipulation.Filter;31import org.junit.runner.manipulation.NoTestsRemainException;32import org.junit.runner.notification.RunListener;33/**34 * Encapsulates access to JUnitCore35 *36 * @author Kristian Rosenvold37 */38class JUnitCoreWrapper39{40    public static void execute( TestsToRun testsToRun, JUnitCoreParameters jUnitCoreParameters,41                                List<RunListener> listeners, Filter filter )42        throws TestSetFailedException43    {44        Computer computer = createComputer( jUnitCoreParameters );45        JUnitCore junitCore = createJUnitCore( listeners );46        if ( testsToRun.allowEagerReading() )47        {48            executeEager( testsToRun, filter, computer, junitCore );49        }50        else51        {52            exeuteLazy( testsToRun, filter, computer, junitCore );53        }54        if ( computer instanceof ParallelComputer )55        {56            String timeoutMessage = ( (ParallelComputer) computer ).describeElapsedTimeout();57            if ( timeoutMessage.length() != 0 )58            {59                throw new TestSetFailedException( timeoutMessage );60            }61        }62    }63    private static JUnitCore createJUnitCore( List<RunListener> listeners )64    {65        JUnitCore junitCore = new JUnitCore();66        for ( RunListener runListener : listeners )67        {68            junitCore.addListener( runListener );69        }70        return junitCore;71    }72    private static void executeEager( TestsToRun testsToRun, Filter filter, Computer computer, JUnitCore junitCore )73        throws TestSetFailedException74    {75        Class[] tests = testsToRun.getLocatedClasses();76        createRequestAndRun( filter, computer, junitCore, tests );77    }78    private static void exeuteLazy( TestsToRun testsToRun, Filter filter, Computer computer, JUnitCore junitCore )79        throws TestSetFailedException80    {81        // in order to support LazyTestsToRun, the iterator must be used82        for ( Class clazz : testsToRun )83        {84            createRequestAndRun( filter, computer, junitCore, clazz );85        }86    }87    private static void createRequestAndRun( Filter filter, Computer computer, JUnitCore junitCore,88                                             Class<?>... classesToRun )89        throws TestSetFailedException90    {91        Request req = Request.classes( computer, classesToRun );92        if ( filter != null )93        {94            req = new FilteringRequest( req, filter );95            if ( req.getRunner() == null )96            {97                // nothing to run98                return;99            }100        }101        final Result run = junitCore.run( req );102        JUnit4RunListener.rethrowAnyTestMechanismFailures( run );103    }104    private static Computer createComputer( JUnitCoreParameters parameters )105        throws TestSetFailedException106    {107        return parameters.isNoThreading()108            ? Computer.serial()109            : ParallelComputerFactory.createParallelComputer( parameters );110    }111    private static class FilteringRequest112        extends Request113    {114        private Runner filteredRunner;115        public FilteringRequest( Request req, Filter filter )116        {117            try118            {119                Runner runner = req.getRunner();120                filter.apply( runner );121                filteredRunner = runner;122            }123            catch ( NoTestsRemainException e )...

Source:GtestComputer.java

1// Copyright 2014 The Chromium Authors. All rights reserved.2// Use of this source code is governed by a BSD-style license that can be3// found in the LICENSE file.4package org.chromium.testing.local;5import org.junit.runner.Computer;6import org.junit.runner.Description;7import org.junit.runner.Runner;8import org.junit.runner.manipulation.Filter;9import org.junit.runner.manipulation.Filterable;10import org.junit.runner.manipulation.NoTestsRemainException;11import org.junit.runner.notification.RunNotifier;12import org.junit.runners.model.InitializationError;13import org.junit.runners.model.RunnerBuilder;14/**15 *  A Computer that logs the start and end of test cases googletest-style.16 */17public class GtestComputer extends Computer {18    private final GtestLogger mLogger;19    public GtestComputer(GtestLogger logger) {20        mLogger = logger;21    }22    /**23     *  A wrapping Runner that logs the start and end of each test case.24     */25    private class GtestSuiteRunner extends Runner implements Filterable {26        private final Runner mRunner;27        public GtestSuiteRunner(Runner contained) {28            mRunner = contained;29        }30        public Description getDescription() {31            return mRunner.getDescription();32        }33        public void run(RunNotifier notifier) {...

Computer

Using AI Code Generation

1import org.junit.runner.Computer;2import org.junit.runner.Result;3import org.junit.runner.JUnitCore;4import org.junit.runner.RunWith;5import org.junit.runners.Suite.SuiteClasses;6import org.junit.Test;7import org.junit.Assert;8import org.junit.BeforeClass;9import org.junit.AfterClass;10import org.junit.Before;11import org.junit.After;12import org.testng.Assert;13import org.testng.annotations.BeforeClass;14import org.testng.annotations.AfterClass;15import org.testng.annotations.BeforeMethod;16import org.testng.annotations.AfterMethod;17import org.testng.annotations.Test;18import org.testng.annotations.Test;19import org.testng.Assert;20import org.testng.annotations.BeforeClass;21import org.testng.annotations.AfterClass;22import org.testng.annotations.BeforeMethod;23import org.testng.annotations.AfterMethod;24import org.testng.annotations.Test;25import org.testng.annotations.Test;26import org.testng.Assert;27import org.testng.annotations.BeforeClass;28import org.testng.annotations.AfterClass;

Computer

Using AI Code Generation

1import org.junit.runner.Computer;2import org.junit.runner.Result;3import org.junit.runner.JUnitCore;4import org.junit.runner.RunWith;5import org.junit.runners.Suite;6import org.junit.runners.Suite.SuiteClasses;7import com.baeldung.junit4.TestClass1;8import com.baeldung.junit4.TestClass2;9import com.baeldung.junit4.TestClass3;10import com.baeldung.junit4.TestClass4;11import com.baeldung.junit4.TestClass5;12import com.baeldung.junit4.TestClass6;13import com.baeldung.junit4.TestClass7;14import com.baeldung.junit4.TestClass8;15import com.baeldung.junit4.TestClass9;16import com.baeldung.junit4.TestClass10;17import com.baeldung.junit4.TestClass11;18import com.baeldung.junit4.TestClass12;19import com.baeldung.junit4.TestClass13;20import com.baeldung.junit4.Test

Computer

Using AI Code Generation

1import org.junit.runner.Computer;2import org.junit.runner.Description;3import org.junit.runner.Result;4import org.junit.runner.notification.RunListener;5import org.junit.runner.notification.RunNotifier;6import org.junit.runners.Suite;7import org.junit.runners.Suite.SuiteClasses;8import org.junit.Test;9import org.junit.runner.JUnitCore;10import org.junit.runner.Request;11public class TestRunner {12   public static void main(String[] args) {13      Result result = JUnitCore.runClasses(TestJunit.class);14      for (Failure failure : result.getFailures()) {15         System.out.println(failure.toString());16      }17      System.out.println(result.wasSuccessful());18   }19}20import org.junit.Test;21import org.junit.Ignore;22import org.junit.BeforeClass;23import org.junit.AfterClass;24import org.junit.Before;25import org.junit.After;26import org.junit.Assert;27public class TestJunit {28   public static void beforeClass() {29      System.out.println("in before class");30   }31   public static void  afterClass() {32      System.out.println("in after class");33   }34   public void before() {35      System.out.println("in before");36   }

Computer

Using AI Code Generation

1import org.junit.runner.Computer;2import org.junit.runner.JUnitCore;3import org.junit.runner.Result;4import org.junit.runner.notification.Failure;5public class TestRunner {6   public static void main(String[] args) {7      Result result = JUnitCore.runClasses(Computer.classes(), TestJunit.class);8      for (Failure failure : result.getFailures()) {9         System.out.println(failure.toString());10      }11      System.out.println(result.wasSuccessful());12   }13}14import org.junit.runner.Computer;15import org.junit.runner.JUnitCore;16import org.junit.runner.Result;17import org.junit.runner.notification.Failure;18public class TestRunner {19   public static void main(String[] args) {20      Result result = JUnitCore.runClasses(Computer.serial(), TestJunit.class);21      for (Failure failure : result.getFailures()) {22         System.out.println(failure.toString());23      }24      System.out.println(result.wasSuccessful());25   }26}27org.junit.runner.Computer classes() method28org.junit.runner.Computer serial() method29org.junit.runner.Computer parallel() method

Computer

Using AI Code Generation

1import org.junit.runner.Computer;2import org.junit.runner.JUnitCore;3import org.junit.runner.Result;4public class TestRunner {5	public static void main(String[] args) {6		Result result = JUnitCore.runClasses(Computer.class, MathUtilsTest.class, StringHelperTest.class);7		System.out.println("Number of test cases executed: " + result.getRunCount());8		System.out.println("Number of test cases failed: " + result.getFailureCount());9		System.out.println("Number of test cases ignored: " + result.getIgnoreCount());10		System.out.println("Total time taken to execute test cases: " + result.getRunTime());11	}12}13JUnitCore.runClasses() method is used to run the test cases in parallel and returns the Result object. This object contains the details of the test cases executed. The Result object has the following methods:

Source: Why is processing a sorted array faster than processing an unsorted array?

1command = commandFactory.createCommand(request.getMethod(), request.getPathInfo());2

JUnit Tutorial:

LambdaTest also has a detailed JUnit tutorial explaining its features, importance, advanced use cases, best practices, and more to help you get started with running your automation testing scripts.

JUnit Tutorial Chapters:

Here are the detailed JUnit testing chapters to help you get started:

Importance of Unit testing - Learn why Unit testing is essential during the development phase to identify bugs and errors.
Top Java Unit testing frameworks - Here are the upcoming JUnit automation testing frameworks that you can use in 2023 to boost your unit testing.
What is the JUnit framework
Why is JUnit testing important - Learn the importance and numerous benefits of using the JUnit testing framework.
Features of JUnit - Learn about the numerous features of JUnit and why developers prefer it.
JUnit 5 vs. JUnit 4: Differences - Here is a complete comparison between JUnit 5 and JUnit 4 testing frameworks.
Setting up the JUnit environment - Learn how to set up your JUnit testing environment.
Getting started with JUnit testing - After successfully setting up your JUnit environment, this chapter will help you get started with JUnit testing in no time.
Parallel testing with JUnit - Parallel Testing can be used to reduce test execution time and improve test efficiency. Learn how to perform parallel testing with JUnit.
Annotations in JUnit - When writing automation scripts with JUnit, we can use JUnit annotations to specify the type of methods in our test code. This helps us identify those methods when we run JUnit tests using Selenium WebDriver. Learn in detail what annotations are in JUnit.
Assertions in JUnit - Assertions are used to validate or test that the result of an action/functionality is the same as expected. Learn in detail what assertions are and how to use them while performing JUnit testing.
Parameterization in JUnit - Parameterized Test enables you to run the same automated test scripts with different variables. By collecting data on each method's test parameters, you can minimize time spent on writing tests. Learn how to use parameterization in JUnit.
Nested Tests In JUnit 5 - A nested class is a non-static class contained within another class in a hierarchical structure. It can share the state and setup of the outer class. Learn about nested annotations in JUnit 5 with examples.
Best practices for JUnit testing - Learn about the best practices, such as always testing key methods and classes, integrating JUnit tests with your build, and more to get the best possible results.
Advanced Use Cases for JUnit testing - Take a deep dive into the advanced use cases, such as how to run JUnit tests in Jupiter, how to use JUnit 5 Mockito for Unit testing, and more for JUnit testing.