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How to use rules method of org.junit.runners.BlockJUnit4Runner class

Best junit code snippet using org.junit.runners.BlockJUnit4Runner.rules

rules

Using AI Code Generation

1@RunWith(BlockJUnit4Runner.class)2public class TestClass {3    public static void main(String[] args) {4        Result result = JUnitCore.runClasses(TestClass.class);5        for (Failure failure : result.getFailures()) {6            System.out.println(failure.toString());7        }8        System.out.println(result.wasSuccessful());9    }10    public void test1() {11        System.out.println("test 1");12    }13    public void test2() {14        System.out.println("test 2");15        assertTrue(false);16    }17}18    at org.junit.Assert.assertEquals(Assert.java:115)19    at org.junit.Assert.assertEquals(Assert.java:144)20    at com.example.TestClass.test2(TestClass.java:23)21    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)22    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)23    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)24    at java.lang.reflect.Method.invoke(Method.java:498)25    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)26    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)27    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)28    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)29    at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:50)30    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)31    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)32    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)33    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)34    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)35    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)36    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)37    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

rules

Using AI Code Generation

1package com.journaldev.junit.rules;2import org.junit.Rule;3import org.junit.Test;4import org.junit.rules.ExpectedException;5public class TestExceptionRule {6	public ExpectedException thrown = ExpectedException.none();7	public void throwsNothing() {8	}9	public void throwsNullPointerException() {10		thrown.expect(NullPointerException.class);11		throw new NullPointerException();12	}13	public void throwsNullPointerExceptionWithMessage() {14		thrown.expect(NullPointerException.class);15		thrown.expectMessage("Hello");16		throw new NullPointerException("Hello");17	}18}19package com.journaldev.junit.rules;20import org.junit.Rule;21import org.junit.Test;22import org.junit.rules.Timeout;23public class TestTimeoutRule {24	public Timeout globalTimeout = Timeout.seconds(1);25	public void testInfiniteLoop1() throws InterruptedException {26		while (true) {27			Thread.sleep(100);28		}29	}30	public void testInfiniteLoop2() throws InterruptedException {31		while (true) {32			Thread.sleep(100);33		}34	}35}36package com.journaldev.junit.rules;37import java.io.File;38import java.io.FileWriter;39import java.io.IOException;40import org.junit.Rule;41import org.junit.Test;42import org.junit.rules.TemporaryFolder;43public class TestTemporaryFolderRule {44	public TemporaryFolder folder = new TemporaryFolder();45	public void testUsingTempFolder() throws IOException {46		File createdFolder = folder.newFolder("newfolder");47		File createdFile = folder.newFile("myfilefile.txt");48		File createdFile2 = folder.newFile("myfilefile2.txt");49		FileWriter writer = new FileWriter(createdFile);50		writer.write("content");51		writer.close();52	}53}54package com.journaldev.junit.rules;55import org.junit.Rule;56import org.junit.Test;57import org.junit.rules.Verifier;58public class TestVerifierRule {59	public Verifier successFile = new Verifier() {60		protected void verify() throws Throwable {

rules

Using AI Code Generation

1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ExpectedException;4public class TestExpectedException {5    public ExpectedException thrown = ExpectedException.none();6    public void throwsNothing() {7    }8    public void throwsNullPointerException() {9        thrown.expect(NullPointerException.class);10        throw new NullPointerException();11    }12    public void throwsNullPointerExceptionWithMessage() {13        thrown.expect(NullPointerException.class);14        thrown.expectMessage("Hello");15        throw new NullPointerException("Hello");16    }17}18In the above example, we are using ExpectedException rule to test for thrown exceptions. The @Rule annotation is used to specify the rule to be used in the test class. In the above example, we are using ExpectedException rule to test for thrown exceptions. The none() method is used to specify that no exception is expected to be thrown. The expect() method is used to specify the expected exception. The expectMessage() method is used to specify the expected exception message. The above example contains three test methods. The first test method throwsNothing() does not throw any exception. Therefore, it passes. The second test method throwsNullPointerException() throws a NullPointerException. Therefore, it passes. The third test method throwsNullPointerExceptionWithMessage() throws a NullPointerException with the message “Hello”. Therefore, it passes. The following is the output of the above example: Output Tests run: 3, Failures: 0, Errors: 0, Skipped

rules

Using AI Code Generation

1public TestName name = new TestName();2public TestWatcher watchman = new TestWatcher() {3    protected void starting(Description description) {4        System.out.println("Starting: " + description.getMethodName());5    }6    protected void succeeded(Description description) {7        System.out.println("Success: " + description.getMethodName());8    }9    protected void failed(Throwable e, Description description) {10        System.out.println("Failed: " + description.getMethodName());11    }12    protected void finished(Description description) {13        System.out.println("Finished: " + description.getMethodName());14    }15};16public void testOne() {17    System.out.println("Test one");18}19public void testTwo() {20    System.out.println("Test two");21}22public void testThree() {23    System.out.println("Test three");24}25public void testFour() {26    System.out.println("Test four");27}28public void testFive() {29    System.out.println("Test five");30}31public void testSix() {32    System.out.println("Test six");33}34public void testSeven() {35    System.out.println("Test seven");36}37public void testEight() {38    System.out.println("Test eight");39}40public void testNine() {41    System.out.println("Test nine");42}43public void testTen() {44    System.out.println("Test ten");45}46public void testEleven() {47    System.out.println("Test eleven");48}49public void testTwelve() {50    System.out.println("Test twelve");51}52public void testThirteen() {53    System.out.println("Test thirteen");54}55public void testFourteen() {56    System.out.println("Test fourteen");57}58public void testFifteen() {59    System.out.println("Test fifteen");60}61public void testSixteen() {62    System.out.println("Test sixteen");63}64public void testSeventeen() {65    System.out.println("Test seventeen");66}67public void testEighteen() {68    System.out.println("Test eighteen");69}70public void testNineteen() {71    System.out.println("Test nineteen");72}73public void testTwenty() {74    System.out.println("Test twenty");75}

rules

Using AI Code Generation

1package com.example;2import org.junit.Test;3import org.junit.runner.RunWith;4import org.junit.runners.BlockJUnit4ClassRunner;5import org.junit.runners.model.InitializationError;6@RunWith(BlockJUnit4ClassRunnerWithRules.class)7public class BlockJUnit4ClassRunnerWithRulesTest {8    public void test() {9        System.out.println("test");10    }11}12public class BlockJUnit4ClassRunnerWithRules extends BlockJUnit4ClassRunner {13    public BlockJUnit4ClassRunnerWithRules(Class<?> klass) throws InitializationError {14        super(klass);15    }16    protected void validateTestMethods(java.util.List<Throwable> errors) {17    }18    protected void validateInstanceMethods(java.util.List<Throwable> errors) {19    }20}

rules

Using AI Code Generation

1@RunWith(Parameterized.class)2public class ParallelTest {3    private int i;4    public ParallelTest(int i) {5        this.i = i;6    }7    public static Collection<Object[]> data() {8        Object[][] data = new Object[10][1];9        for (int i = 0; i < 10; i++) {10            data[i][0] = i;11        }12        return Arrays.asList(data);13    }14    public void test() throws InterruptedException {15        System.out.println("Test: " + i);16        Thread.sleep(5000);17    }18}19@RunWith(Parameterized.class)20public class ParallelTest {21    private int i;22    public ParallelTest(int i) {23        this.i = i;24    }25    public static Collection<Object[]> data() {26        Object[][] data = new Object[10][1];27        for (int i = 0; i < 10; i++) {28            data[i][0] = i;29        }30        return Arrays.asList(data);31    }32    public void test() throws InterruptedException {33        System.out.println("Test: " + i);34        Thread.sleep(5000);35    }36}37@RunWith(Parameterized.class)38public class ParallelTest {39    private int i;40    public ParallelTest(int i) {41        this.i = i;42    }43    public static Collection<Object[]> data() {44        Object[][] data = new Object[10][1];45        for (int i = 0; i < 10; i++) {46            data[i][0] = i;47        }48        return Arrays.asList(data);49    }50    public void test() throws InterruptedException {51        System.out.println("Test: " + i);52        Thread.sleep(5000);53    }54}55@RunWith(Parameterized.class)56public class ParallelTest {57    private int i;58    public ParallelTest(int i) {59        this.i = i;60    }

rules

Using AI Code Generation

1@RunWith(RulesRunner.class)2public class RulesRunnerTest {3    public final TestRule rule = new TestRule() {4        public Statement apply(final Statement base, final Description description) {5            return new Statement() {6                public void evaluate() throws Throwable {7                    System.out.println("before test");8                    base.evaluate();9                    System.out.println("after test");10                }11            };12        }13    };14    public void test() {15        System.out.println("test");16    }17}18@RunWith(RulesRunner.class)19public class RulesRunnerTest {20    public final TestRule rule = new TestRule() {21        public Statement apply(final Statement base, final Description description) {22            return new Statement() {23                public void evaluate() throws Throwable {24                    System.out.println("before test");25                    try {26                        base.evaluate();27                    } catch (Throwable t) {28                        System.out.println("test failed");29                        throw t;30                    }31                    System.out.println("after test");32                }33            };34        }35    };36    public void test() {37        System.out.println("test");38    }39    public void test2() {40        System.out.println("test2");41        throw new RuntimeException("test2 failed");42    }43}44@RunWith(RulesRunner.class)45public class RulesRunnerTest {46    public final TestRule rule = new TestRule() {47        public Statement apply(final Statement base, final Description description) {48            return new Statement() {49                public void evaluate() throws Throwable {50                    System.out.println("before test");51                    try {52                        base.evaluate();53                    } catch (Throwable t) {54                        System.out.println("test failed");55                        throw t;56                    }57                    System.out.println("after test");58                }59            };60        }61    };

rules

Using AI Code Generation

1import org.junit.runner.notification.RunNotifier;2import org.junit.runners.BlockJUnit4Runner;3import org.junit.runners.model.InitializationError;4import org.junit.runners.model.Statement;5public class BlockJUnit4Runner extends org.junit.runners.BlockJUnit4Runner {6  public BlockJUnit4Runner(Class<?> klass) throws InitializationError {7    super(klass);8  }9  protected Statement methodInvoker(FrameworkMethod method, Object test) {10    return new ThreadStatement(super.methodInvoker(method, test));11  }12  private class ThreadStatement extends Statement {13    private final Statement statement;14    public ThreadStatement(Statement statement) {15      this.statement = statement;16    }17    public void evaluate() throws Throwable {18      Thread thread = new Thread() {19        public void run() {20          try {21            statement.evaluate();22          } catch (Throwable e) {23            e.printStackTrace();24          }25        }26      };27      thread.start();28      thread.join();29    }30  }31}32import org.junit.runner.notification.RunNotifier;33import org.junit.runners.BlockJUnit4Runner;34import org.junit.runners.model.InitializationError;35import org.junit.runners.model.Statement;36public class BlockJUnit4Runner extends org.junit.runners.BlockJUnit4Runner {37  public BlockJUnit4Runner(Class<?> klass) throws InitializationError {38    super(klass);39  }40  protected Statement methodInvoker(FrameworkMethod method, Object test) {41    return new ThreadStatement(super.methodInvoker(method, test));42  }43  private class ThreadStatement extends Statement {44    private final Statement statement;45    public ThreadStatement(Statement statement) {46      this.statement = statement;47    }48    public void evaluate() throws Throwable {49      Thread thread = new Thread() {50        public void run() {51          try {52            statement.evaluate();53          } catch (Throwable e) {54            e.printStackTrace();55          }56        }57      };

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.