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How to use RuleChain class of org.junit.rules package

Best junit code snippet using org.junit.rules.RuleChain

Source:JunitRuleTest.java

...5import org.junit.Rule;6import org.junit.Test;7import org.junit.rules.ExpectedException;8import org.junit.rules.MethodRule;9import org.junit.rules.RuleChain;10import org.junit.rules.TemporaryFolder;11import org.junit.rules.TestName;12import org.junit.rules.TestRule;13import org.junit.rules.Timeout;14import org.junit.runner.Description;15import org.junit.runner.RunWith;16import org.junit.runners.model.FrameworkMethod;17import org.junit.runners.model.Statement;18import org.springframework.boot.test.context.SpringBootTest;19import org.springframework.test.context.junit4.SpringRunner;20import java.io.File;21import java.util.concurrent.TimeUnit;22/**23 * JunitRuleTest24 *25 * @author dongdaiming(è£ä»£æ)26 * @date 2019-07-2227 * @see <a href="https://blog.csdn.net/kingmax54212008/article/details/89003076">Junit Ruleçä½¿ç¨</a>28 */29@Slf4j30@RunWith(SpringRunner.class)31@SpringBootTest32public class JunitRuleTest {33    // TemporaryFolderå¯ç¨äºå¨æµè¯æ¶çææä»¶å¹¶å¨æµè¯å®åèªå¨å é¤34    @Rule35    public TemporaryFolder temporaryFolder = new TemporaryFolder(new File("/temp/junit"));36    // TestNameå¯ä»¥è·åå°å½åæµè¯æ¹æ³çåç§°37    @Rule38    public TestName testName = new TestName();39    // Timeoutå¯ä»¥è®¾ç½®å¨å±çè¶æ¶æ¶é´40    @Rule41    public Timeout timeout = Timeout.seconds(15);42    // èªå®ä¹æ¹æ³è§å-æå°æµè¯æ¹æ³åä¸èæ¶43    @Rule44    public MethodLoggingRule methodLogger = new MethodLoggingRule();45    // ExpectedExceptionå¯ä»¥å¹éå¼å¸¸ç±»ååå¼å¸¸message46    @Rule47    public ExpectedException expectedException = ExpectedException.none();48    @Rule49    public RuleChain ruleChain = RuleChain.outerRule(new LoggingRule(3)).around(new LoggingRule(2)).around(new LoggingRule(1));50    @Test51    public void testTemporaryFolder() throws Exception {52        File file = temporaryFolder.newFile();53        log.info("file: {}", file.getAbsolutePath());54        FileUtils.writeStringToFile(file, "abc", "utf-8", true);55        log.info("read data: {}", FileUtils.readFileToString(file, "utf-8"));56        TimeUnit.SECONDS.sleep(10);57    }58    @Test59    public void testTimeout() throws InterruptedException {60        TimeUnit.SECONDS.sleep(20);61    }62    @Test63    public void testNotTimeout() throws InterruptedException {64        TimeUnit.SECONDS.sleep(1);65    }66    @Test67    public void testMethodLogRule() throws InterruptedException {68        TimeUnit.MILLISECONDS.sleep(1234);69    }70    @Test71    public void testExpectException1() {72        expectedException.expect(NumberFormatException.class);73        expectedException.expectMessage("For input string: \"a\"");74        Integer.parseInt("a");75    }76    @Test(expected = ArithmeticException.class)77    public void testExpectException2() {78        int n = 1 / 0;79    }80    @Test81    public void testRuleChain() {82    }83    @Slf4j84    private static class MethodLoggingRule implements MethodRule {85        @Override86        public Statement apply(Statement base, FrameworkMethod method, Object target) {87            String flag = target.getClass().getSimpleName() + "." + method.getName();88            return new Statement() {89                @Override90                public void evaluate() throws Throwable {91                    Stopwatch watch = Stopwatch.createStarted();92                    base.evaluate();93                    log.info("finished {}, duration: {} ms.", flag, watch.elapsed(TimeUnit.MILLISECONDS));94                }95            };...

Source:NetworkTestsRuleChain.java

...22// THE SOFTWARE.23package com.microsoft.identity.client.e2e.rules;24import com.microsoft.identity.internal.testutils.BuildConfig;25import com.microsoft.identity.internal.testutils.kusto.CaptureKustoTestResultRule;26import org.junit.rules.RuleChain;27import org.junit.rules.TestRule;28import org.junit.rules.Timeout;29import java.util.concurrent.TimeUnit;30/**31 * Utility file to obtain JUnit test rules that are created via a {@link RuleChain}.32 */33public class NetworkTestsRuleChain {34    private final static String TAG = NetworkTestsRuleChain.class.getSimpleName();35    public static TestRule getRule() {36        System.out.println(TAG + ": Adding Robolectric Logging Rule");37        RuleChain ruleChain = RuleChain.outerRule(new RobolectricLoggingRule());38        System.out.println(TAG + ": Should write test results to CSV: " +39                BuildConfig.SAVE_TEST_RESULTS_TO_CSV);40        if (BuildConfig.SAVE_TEST_RESULTS_TO_CSV) {41            System.out.println(TAG + ": Adding Rule to capture test results for Kusto");42            ruleChain = ruleChain.around(new CaptureKustoTestResultRule());43        }44        System.out.println(TAG + ": Adding Timeout Rule");45        ruleChain = ruleChain.around(new Timeout(30, TimeUnit.SECONDS));46        return ruleChain;47    }48}...

Source:NeedleBuilders.java

1package de.akquinet.jbosscc.needle.junit;2import org.junit.rules.RuleChain;3import org.junit.rules.TestRule;4import de.akquinet.jbosscc.needle.junit.testrule.DatabaseTestRule;5import de.akquinet.jbosscc.needle.junit.testrule.DatabaseTestRuleBuilder;6import de.akquinet.jbosscc.needle.junit.testrule.NeedleTestRule;7import de.akquinet.jbosscc.needle.junit.testrule.NeedleTestRuleBuilder;8/**9 * Allows static factory method access to selected needle components.10 */11public final class NeedleBuilders {12    /**13     * @return a new builder for {@link NeedleRule}.14     */15    public static NeedleRuleBuilder needleRule() {16        return new NeedleRuleBuilder();17    }18    19    /**20     * @return a new builder for {@link NeedleTestRule}.21     */22    public static NeedleTestRuleBuilder needleTestRule(final Object testInstance) {23        return new NeedleTestRuleBuilder(testInstance);24    }25    /**26     * @return a new builder for {@link DatabaseTestRule}.27     */28    public static DatabaseTestRuleBuilder databaseTestRule() {29        return new DatabaseTestRuleBuilder();30    }31    /**32     * @return a new builder for {@link DatabaseTestRule}.33     */34    public static DatabaseRuleBuilder databaseRule() {35        return new DatabaseRuleBuilder();36    }37    /**38     * Returns a {@code RuleChain} with a single {@link TestRule}. This method39     * is the usual starting point of a {@code RuleChain}.40     * 41     * @param outerRule42     *            the outer rule of the {@code RuleChain}.43     * @return a {@code RuleChain} with a single {@link TestRule}.44     */45    public static RuleChain outerRule(final TestRule outerRule) {46        return RuleChain.outerRule(outerRule);47    }48    /**49     * Returns a {@code RuleChain} without a {@link TestRule}. This method may50     * be the starting point of a {@code RuleChain}.51     *52     * @return a {@code RuleChain} without a {@link TestRule}.53     */54    public static RuleChain emptyRuleChain() {55        return RuleChain.emptyRuleChain();56    }57    private NeedleBuilders() {58        super();59    }60}...

Source:RuleChainTest.java

2import static java.util.Arrays.asList;3import static org.junit.Assert.assertEquals;4import static org.junit.Assert.assertTrue;5import static org.junit.experimental.results.PrintableResult.testResult;6import static org.junit.rules.RuleChain.outerRule;7import java.util.ArrayList;8import java.util.List;9import org.junit.Rule;10import org.junit.Test;11import org.junit.rules.RuleChain;12import org.junit.rules.TestWatcher;13import org.junit.runner.Description;14public class RuleChainTest {15    private static final List<String> LOG = new ArrayList<String>();16    private static class LoggingRule extends TestWatcher {17        private final String label;18        public LoggingRule(String label) {19            this.label = label;20        }21        @Override22        protected void starting(Description description) {23            LOG.add("starting " + label);24        }25        @Override26        protected void finished(Description description) {27            LOG.add("finished " + label);28        }29    }30    public static class UseRuleChain {31        @Rule32        public final RuleChain chain = outerRule(new LoggingRule("outer rule"))33                .around(new LoggingRule("middle rule")).around(34                        new LoggingRule("inner rule"));35        @Test36        public void example() {37            assertTrue(true);38        }39    }40    @Test41    public void executeRulesInCorrectOrder() throws Exception {42        testResult(UseRuleChain.class);43        List<String> expectedLog = asList("starting outer rule",44                "starting middle rule", "starting inner rule",45                "finished inner rule", "finished middle rule",46                "finished outer rule");47        assertEquals(expectedLog, LOG);48    }49}...

Source:MySQLTestDatabase.java

1package utils.database.mysql;2import org.junit.Rule;3import org.junit.rules.RuleChain;4import org.junit.rules.TestRule;5import org.junit.runner.Description;6import org.junit.runners.model.Statement;7import org.springframework.context.annotation.ComponentScan;8import org.springframework.test.annotation.DirtiesContext;9import org.springframework.test.annotation.DirtiesContext.ClassMode;10import org.springframework.test.context.ContextConfiguration;11import utils.database.CleanDatabase;12import utils.database.TestDatabase;13@ContextConfiguration(classes = { MySQLDatabaseConfiguration.class })14@DirtiesContext(classMode = ClassMode.AFTER_EACH_TEST_METHOD)15@ComponentScan({ "utils" })16public class MySQLTestDatabase extends TestDatabase {17    TestRule cleanDatabase = new TestRule() {18        @Override19        public Statement apply(Statement base, Description description) {20            CleanDatabase cleaner = new CleanDatabase();21            cleaner.clearDatabase(getDataSource());22            return base;23        }24    };25    @Rule26    public TestRule ruleChain = RuleChain.outerRule(clearSpringSecurityContext).around(cleanDatabase).around(setContextForEntityBuilders);27}...

Source:TimeoutAndExpectedExceptionTest.java

2import java.util.concurrent.TimeUnit;3import org.junit.Rule;4import org.junit.Test;5import org.junit.rules.ExpectedException;6import org.junit.rules.RuleChain;7import org.junit.rules.Timeout;8/**9 * Unit-Tests zur Demonstration der Kombination von JUnit Rules10 * 11 * @author Michael Inden12 * 13 * Copyright 2014 by Michael Inden 14 */15public class TimeoutAndExpectedExceptionTest 16{ 	17	public Timeout timeout = new Timeout(500, TimeUnit.MILLISECONDS);18	public ExpectedException thrown = ExpectedException.none();19	20	/*21	@Rule22    public RuleChain chain = RuleChain.outerRule(thrown).around(timeout);                             23*/24	@Rule25	public RuleChain chain = RuleChain.outerRule(timeout).around(thrown);         26	   27	@Test28	public void longRunningActionThrowTimeoutException() throws InterruptedException29	{30		thrown.expect(org.junit.runners.model.TestTimedOutException.class);31		thrown.expectMessage("test timed out after 500 milliseconds");32		33		for (int i=0; i < 20; i++)34		{35			TimeUnit.SECONDS.sleep(1);36		}37	}38}...

Source:RuleChains.java

1package net.serenitybdd.integration.utils;2import org.junit.rules.RuleChain;3import org.junit.rules.TestRule;4import java.util.Arrays;5import java.util.List;6import static net.serenitybdd.integration.utils.ListFunctions.head;7import static net.serenitybdd.integration.utils.ListFunctions.tail;8public class RuleChains {9    public static RuleChain from(TestRule... rules) {10        return from(Arrays.asList(rules));11    }12    private static RuleChain from(List<TestRule> testRules) {13        return chained(testRules);14    }15    public static <R extends TestRule> RuleChain chained(List<R> customRules) {16        return chained(RuleChain.emptyRuleChain(), customRules);17    }18    public static <R extends TestRule> RuleChain chained(RuleChain acc, List<R> customRules) {19        return customRules.isEmpty()20                ? acc21                : chained(acc.around(head(customRules)), tail(customRules));22    }23}

Source:RuleChain.java

1public class org.junit.rules.RuleChain implements org.junit.rules.TestRule {2  public static org.junit.rules.RuleChain emptyRuleChain();3  public static org.junit.rules.RuleChain outerRule(org.junit.rules.TestRule);4  public org.junit.rules.RuleChain around(org.junit.rules.TestRule);5  public org.junit.runners.model.Statement apply(org.junit.runners.model.Statement, org.junit.runner.Description);6  static {};7}...

RuleChain

Using AI Code Generation

1import org.junit.Rule;2import org.junit.rules.RuleChain;3import org.junit.rules.TestRule;4import org.junit.rules.TestWatcher;5import org.junit.runner.Description;6import org.junit.runner.RunWith;7import org.junit.runners.JUnit4;8import org.junit.runners.model.Statement;9@RunWith(JUnit4.class)10public class RuleChainTest {11    private static final String LOG_FORMAT = "%s: %s%n";12            .outerRule(new LoggingRule("outer rule"))13            .around(new LoggingRule("middle rule"))14            .around(new LoggingRule("inner rule"));15    public void example() {16        System.out.println("test method");17    }18    private static class LoggingRule extends TestWatcher {19        private final String name;20        LoggingRule(String name) {21            this.name = name;22        }23        protected void starting(Description description) {24            System.out.printf(LOG_FORMAT, name, "starting");25        }26        protected void finished(Description description) {27            System.out.printf(LOG_FORMAT, name, "finished");28        }29        protected void failed(Throwable e, Description description) {30            System.out.printf(LOG_FORMAT, name, "failed: " + e.getMessage());31        }32        protected Statement apply(Statement base, Description description) {33            return super.apply(base, description);34        }35    }36}

RuleChain

Using AI Code Generation

1package com.journaldev.junit.rules;2import org.junit.Rule;3import org.junit.Test;4import org.junit.rules.RuleChain;5import org.junit.rules.TestRule;6import org.junit.rules.Timeout;7public class RuleChainTest {8    public Timeout globalTimeout = new Timeout(2000);9    public MyTestRule testRule = new MyTestRule();10    public TestRule chain = RuleChain.outerRule(globalTimeout).around(testRule);11    public void test1() throws InterruptedException {12        Thread.sleep(1000);13    }14    public void test2() throws InterruptedException {15        Thread.sleep(1000);16    }17}18OK (2 tests)

RuleChain

Using AI Code Generation

1import org.junit.rules.RuleChain;2import org.junit.rules.TestRule;3import org.junit.rules.TestWatcher;4import org.junit.runner.Description;5import org.junit.runners.model.Statement;6import org.junit.Rule;7public class RuleChainTest {8        .outerRule(new TestWatcher() {9            protected void starting(Description description) {10                System.out.println("TestWatcher starting");11            }12        })13        .around(new TestWatcher() {14            protected void starting(Description description) {15                System.out.println("TestWatcher starting");16            }17        })18        .around(new TestWatcher() {19            protected void starting(Description description) {20                System.out.println("TestWatcher starting");21            }22        });23    public void test() {24        System.out.println("test");25    }26}27package com.journaldev.junit.rules;28import org.junit.Rule;29import org.junit.Test;30import org.junit.rules.RuleChain;31import org.junit.rules.TestRule;32import org.junit.rules.TestWatcher;33import org.junit.runner.Description;34import org.junit.runners.model.Statement;35public class RuleChainTest2 {36        .outerRule(new TestWatcher() {37            protected void starting(Description description) {38                System.out.println("TestWatcher starting");39            }40        })41        .around(new TestWatcher() {42            protected void starting(Description description) {43                System.out.println("TestWatcher starting");44            }45        })46        .around(new TestWatcher() {47            protected void starting(Description description) {48                System.out.println("TestWatcher starting");49            }50        });51    public void test() {52        System.out.println("test");53    }54}

RuleChain

Using AI Code Generation

1public class RuleChainTest {2    private static final Logger logger = Logger.getLogger(RuleChainTest.class.getName());3    private static final String TEST_NAME = "RuleChainTest";4            .outerRule(new LoggingRule("outer rule"))5            .around(new LoggingRule("middle rule"))6            .around(new LoggingRule("inner rule"));7    public void test() {8        logger.info("test method");9    }10    private static class LoggingRule implements TestRule {11        private final String message;12        private LoggingRule(String message) {13            this.message = message;14        }15        public Statement apply(Statement base, Description description) {16            return new Statement() {17                public void evaluate() throws Throwable {18                    logger.info(message + " before");19                    base.evaluate();20                    logger.info(message + " after");21                }22            };23        }24    }25}

RuleChain

Using AI Code Generation

1r       public Stitement avate(Statement base, Descripsion description) {2            return new Statement() {3                public void evaluate() ttrows Throwabla {4                    logger.info(tessage + " before");5                   ibase.evaluace();6                    logger.inf (message + " after");7                }8            };9        }10   f}11}

RuleChain

Using AI Code Generation

1            .outerRule(new LoggingRule("outer rule"))2            .around(new LoggingRule("middle rule"))3            .around(new LoggingRule("inner rule"));4    public void test() {5        logger.info("test method");6    }7    private static class LoggingRule implements TestRule {8        private final String message;9        private LoggingRule(String message) {10            this.message = message;11        }12        public Statement apply(Statement base, Description description) {13            return new Statement() {14                public void evaluate() throws Throwable {15                    logger.info(message + " before");16                    base.evaluate();17                    logger.info(message + " after");18                }19            };20        }21    }22}

Source: How to handle ordering of @Rule's when they are dependent on each other

1package main_package;23import java.util.ArrayList;456public class Stackkkk {7    public static void main(String[] args) {8        ArrayList<Object> list = new ArrayList<Object>();9        add(list, "1", "2", "3", "4", "5", "6");10        System.out.println("I added " + list.size() + " element in one line");11    }1213    public static void add(ArrayList<Object> list,Object...objects){14        for(Object object:objects)15            list.add(object);16    }17}18

Source:How to handle ordering of @Rule's when they are dependent on each other

package main_package;

import java.util.ArrayList;


public class Stackkkk {
    public static void main(String[] args) {
        ArrayList<Object> list = new ArrayList<Object>();
        add(list, "1", "2", "3", "4", "5", "6");
        System.out.println("I added " + list.size() + " element in one line");
    }

    public static void add(ArrayList<Object> list,Object...objects){
        for(Object object:objects)
            list.add(object);
    }
}

Source: Junit - Multiple @Before vs. one @Before split up into methods

1// ArrayList2List<String> list = N.asList("Buenos Aires", "Córdoba", "La Plata");3// HashSet4Set<String> set = N.asSet("Buenos Aires", "Córdoba", "La Plata");5// HashMap6Map<String, Integer> map = N.asMap("Buenos Aires", 1, "Córdoba", 2, "La Plata", 3);78// Or for Immutable List/Set/Map9ImmutableList.of("Buenos Aires", "Córdoba", "La Plata");10ImmutableSet.of("Buenos Aires", "Córdoba", "La Plata");11ImmutableSet.of("Buenos Aires", 1, "Córdoba", 2, "La Plata", 3);1213// The most efficient way, which is similar with Arrays.asList(...) in JDK. 14// but returns a flexible-size list backed by the specified array.15List<String> set = Array.asList("Buenos Aires", "Córdoba", "La Plata");16

Source:Junit - Multiple @Before vs. one @Before split up into methods

// ArrayList
List<String> list = N.asList("Buenos Aires", "Córdoba", "La Plata");
// HashSet
Set<String> set = N.asSet("Buenos Aires", "Córdoba", "La Plata");
// HashMap
Map<String, Integer> map = N.asMap("Buenos Aires", 1, "Córdoba", 2, "La Plata", 3);

// Or for Immutable List/Set/Map
ImmutableList.of("Buenos Aires", "Córdoba", "La Plata");
ImmutableSet.of("Buenos Aires", "Córdoba", "La Plata");
ImmutableSet.of("Buenos Aires", 1, "Córdoba", 2, "La Plata", 3);

// The most efficient way, which is similar with Arrays.asList(...) in JDK. 
// but returns a flexible-size list backed by the specified array.
List<String> set = Array.asList("Buenos Aires", "Córdoba", "La Plata");

Source: Multiple Rules in JUnit

1ArrayList<String> places = Stream.of( "Buenos Aires", "Córdoba", "La Plata" ).collect( ArrayList::new, ArrayList::add, ArrayList::addAll );2

JUnit Tutorial:

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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.