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

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...17import org.junit.platform.commons.util.PreconditionViolationException;18import org.junit.rules.ErrorCollector;19import org.junit.rules.TemporaryFolder;20import org.junit.rules.TestRule;21import org.junit.rules.Verifier;22/​**23 * @since 5.024 */​25public class AbstractTestRuleAdapterTests {26 @Test27 void constructionWithAssignableArgumentsIsSuccessful() {28 new TestableTestRuleAdapter(new SimpleRuleAnnotatedMember(new ErrorCollector()), Verifier.class);29 }30 @Test31 void constructionWithUnassignableArgumentsFails() {32 PreconditionViolationException exception = assertThrows(PreconditionViolationException.class,33 () -> new TestableTestRuleAdapter(new SimpleRuleAnnotatedMember(new TemporaryFolder()), Verifier.class));34 assertEquals(exception.getMessage(),35 "class org.junit.rules.Verifier is not assignable from class org.junit.rules.TemporaryFolder");36 }37 @Test38 void exceptionsDuringMethodLookupAreWrappedAndThrown() {39 AbstractTestRuleAdapter adapter = new AbstractTestRuleAdapter(40 new SimpleRuleAnnotatedMember(new ErrorCollector()), Verifier.class) {41 @Override42 public void before() {43 super.executeMethod("foo");44 }45 };46 JUnitException exception = assertThrows(JUnitException.class, adapter::before);47 assertEquals(exception.getMessage(), "Failed to find method foo() in class org.junit.rules.ErrorCollector");48 }49 private static class TestableTestRuleAdapter extends AbstractTestRuleAdapter {50 TestableTestRuleAdapter(TestRuleAnnotatedMember annotatedMember, Class<? extends TestRule> adapteeClass) {51 super(annotatedMember, adapteeClass);52 }53 }54 private static class SimpleRuleAnnotatedMember implements TestRuleAnnotatedMember {...

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...11import static org.apiguardian.api.API.Status.EXPERIMENTAL;12import org.apiguardian.api.API;13import org.junit.jupiter.api.extension.AfterEachCallback;14import org.junit.jupiter.api.extension.ExtensionContext;15import org.junit.jupiter.migrationsupport.rules.adapter.VerifierAdapter;16import org.junit.rules.Verifier;17/​**18 * This {@code Extension} provides native support for subclasses of19 * the {@link Verifier} rule from JUnit 4.20 *21 * <p>{@code @Rule}-annotated fields as well as methods are supported.22 *23 * <p>By using this class-level extension on a test class such24 * {@code Verifier} implementations in legacy code bases25 * can be left unchanged including the JUnit 4 rule import statements.26 *27 * <p>However, if you intend to develop a <em>new</​em> extension for28 * JUnit 5 please use the new extension model of JUnit Jupiter instead29 * of the rule-based model of JUnit 4.30 *31 * @since 5.032 * @see org.junit.rules.Verifier33 * @see org.junit.rules.TestRule34 * @see org.junit.Rule35 */​36@API(status = EXPERIMENTAL, since = "5.0")37public class VerifierSupport implements AfterEachCallback {38 private final TestRuleSupport support = new TestRuleSupport(VerifierAdapter::new, Verifier.class);39 @Override40 public void afterEach(ExtensionContext context) throws Exception {41 this.support.afterEach(context);42 }43}...

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1class org.junit.rules.Verifier$1 extends org.junit.runners.model.Statement {2 final org.junit.runners.model.Statement val$base;3 final org.junit.rules.Verifier this$0;4 org.junit.rules.Verifier$1(org.junit.rules.Verifier, org.junit.runners.model.Statement);5 public void evaluate() throws java.lang.Throwable;6}...

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Verifier

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1import org.junit.rules.Verifier;2public class VerifierTest {3 public VerifierTest() {4 }5 public Verifier verifier = new Verifier() {6 protected void verify() throws Throwable {7 System.out.println("Verifying...");8 }9 };10 public void test1() {11 System.out.println("Test 1");12 }13 public void test2() {14 System.out.println("Test 2");15 }16}

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1import org.junit.rules.Verifier;2import org.junit.Rule;3public class VerifierTest {4 public Verifier verifier = new Verifier() {5 protected void verify() throws Throwable {6 System.out.println("Verifying...");7 }8 };9 public void test1() {10 System.out.println("Test 1");11 }12 public void test2() {13 System.out.println("Test 2");14 }15}16package com.journaldev.junit.rules;17import org.junit.Rule;18import org.junit.Test;19import org.junit.rules.Verifier;20public class VerifierTest {21 private int testCount = 0;22 public Verifier verifier = new Verifier() {23 protected void verify() throws Throwable {24 System.out.println("Verifying...");25 testCount++;26 }27 };28 public void test1() {29 System.out.println("Test 1");30 }31 public void test2() {32 System.out.println("Test 2");33 }34 public int getTestCount() {35 return testCount;36 }37}38package com.journaldev.junit.rules;39import org.junit.Test;40import static org.junit.Assert.*;41public class VerifierTestTest {42 public void testGetTestCount() {43 VerifierTest verifierTest = new VerifierTest();44 verifierTest.test1();45 verifierTest.test2();46 assertEquals(2, verifierTest.getTestCount());47 }48}

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1import org.junit.rules.Verifier;2import org.junit.Rule;3public class VerifierTest {4 private String str;5 public Verifier verifier = new Verifier() {6 protected void verify() throws Throwable {7 System.out.println("Verifying the str value");8 if (str == null) {9 throw new NullPointerException("str is null");10 }11 }12 };13 public void test1() {14 System.out.println("Test1");15 str = "Hello";16 }17 public void test2() {18 System.out.println("Test2");19 }20}21 at VerifierTest$1.verify(VerifierTest.java:16)22 at org.junit.rules.Verifier$1.evaluate(Verifier.java:21)23 at org.junit.rules.RunRules.evaluate(RunRules.java:20)24 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)25 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)26 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)27 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)28 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)29 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)30 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)31 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)32 at org.junit.runners.ParentRunner.run(ParentRunner.java:309)33 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)34 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)35 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)36 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)37 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)38 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

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1import org.junit.rules.Verifier;2public class VerifierRuleTest {3 public static String log;4 public Verifier collector = new Verifier() {5 public void verify() {6 log += "verify ";7 }8 };9 public void testOne() {10 log += "testOne ";11 }12 public void testTwo() {13 log += "testTwo ";14 }15 public void after() {16 log += "after ";17 }18 public void before() {19 log += "before ";20 }21}22import org.junit.rules.ExpectedException;23public class ExpectedExceptionRuleTest {24 public ExpectedException thrown = ExpectedException.none();25 public void throwsNothing() {26 }27 public void throwsNullPointerException() {28 thrown.expect(NullPointerException.class);29 throw new NullPointerException();30 }31 public void throwsNullPointerExceptionWithMessage() {32 thrown.expect(NullPointerException.class);33 thrown.expectMessage("happened");34 throw new NullPointerException("What happened?");35 }36}37import org.junit.rules.TemporaryFolder;38public class TemporaryFolderRuleTest {39 public TemporaryFolder folder = new TemporaryFolder();40 public void testUsingTempFolder() throws IOException {41 File createdFolder = folder.newFolder("newfolder");42 File createdFile = folder.newFile("myfilefile.txt");43 assertTrue(createdFolder.exists());44 assertTrue(createdFile.exists());45 }46}47import org.junit.rules.TestName;48public class TestNameRuleTest {49 public TestName name = new TestName();50 public void testA() {51 assertEquals("testA", name.getMethodName());52 }53 public void testB() {54 assertEquals("testB", name.getMethodName());55 }56}

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1import org.junit.rules.Verifier;2public class VerifierRuleTest {3 private String str = "Hello World";4 public Verifier verifier = new Verifier() {5 protected void verify() throws Throwable {6 assertEquals("Hello World", str);7 }8 };9 public void test() {10 str = "Hello World";11 }12}13public ExpectedException exception = ExpectedException.none();14package com.javatpoint.junit.rules; 15import static org.junit.Assert.assertEquals;16import org.junit.Rule;17import org.junit.Test;18import org.junit.rules.ExpectedException;19public class ExpectedExceptionRuleTest {20 public ExpectedException exception = ExpectedException.none();21 public void test() {22 exception.expect(ArithmeticException.class);23 exception.expectMessage("/​ by zero");24 int i = 1 /​ 0;25 }26}27public TemporaryFolder folder = new TemporaryFolder();28package com.javatpoint.junit.rules; 29import static org.junit.Assert.assertEquals;30import java.io.File;31import java.io.IOException;32import org.junit.Rule;33import org.junit.Test;34import org.junit.rules.TemporaryFolder;35public class TemporaryFolderRuleTest {36 public TemporaryFolder folder = new TemporaryFolder();37 public void test() throws IOException {38 File file = folder.newFile("file.txt");39 assertEquals("file.txt", file.getName());40 }41}

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1import org.junit.rules.Verifier;2public class VerifierTest {3 private static final String FILE_NAME = "test.txt";4 private static final String FILE_CONTENT = "This is a test file.";5 private static final String FILE_CONTENT_2 = "This is a test file. This is a test file.";6 private static final String FILE_CONTENT_3 = "This is a test file. This is a test file. This is a test file.";7 private static final String FILE_CONTENT_4 = "This is a test file. This is a test file. This is a test file. This is a test file.";8 private static final String FILE_NAME1 = "test1.txt";9 private static final String FILE_CONTENT1 = "This is a test file.";10 private static final String FILE_CONTENT1_2 = "This is a test file. This is a test file.";11 private static final String FILE_CONTENT1_3 = "This is a test file. This is a test file. This is a test file.";12 private static final String FILE_CONTENT1_4 = "This is a test file. This is a test file. This is a test file. This is a test file.";13 private static final String FILE_NAME2 = "test2.txt";14 private static final String FILE_CONTENT2 = "This is a test file.";15 private static final String FILE_CONTENT2_2 = "This is a test file. This is a test file.";16 private static final String FILE_CONTENT2_3 = "This is a test file. This is a test file. This is a test file.";17 private static final String FILE_CONTENT2_4 = "This is a test file. This is a test file. This is a test file. This is a test file.";18 private static final String FILE_NAME3 = "test3.txt";19 private static final String FILE_CONTENT3 = "This is a test file.";20 private static final String FILE_CONTENT3_2 = "This is a test file. This is a test file.";21 private static final String FILE_CONTENT3_3 = "This is a test file. This is a test file. This is a test file.";22 private static final String FILE_CONTENT3_4 = "This is a test file. This is a test file. This is a test file. This is a test file.";

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1@Configuration2@EnableTransactionManagement /​/​ +++ added annotation3@EnableJpaRepositories(basePackages = "com.stackoverflow.my.project")4@PropertySource("application-tests.properties")5@ComponentScan({ "com.stackoverflow.my.project" })6public class H2JpaConfig {78@Bean9 public PlatformTransactionManager transactionManager() {10 final HibernateTransactionManager transactionManager = new HibernateTransactionManager();11 transactionManager.setSessionFactory(sessionFactory().getObject());12 return transactionManager;13 }14}15
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1@TestDoc(text="tests for XXX-342, fixes customer issue blahblah")2@Test3public void testForReallyBigThings() {4 /​/​ stuff5}6
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StackOverFlow community discussions

Questions
Discussion

How to verify Map size using Hamcrest

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java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing

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JUnit4 run all tests in a specific package using a testsuite

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Unable to run JUnit test with PowerMockRunner

The good news

There is a matcher that does exactly what you want in the current master branch of the JavaHamcrest project. You can call it like so:

assertThat(mapMap, aMapWithSize(1));

And the bad news

Unfortunately this matcher is not in the latest release of Hamcrest (1.3).

[Update] And finally the very good news

The aforementioned matcher is included in the newly released version 2.1.

https://stackoverflow.com/questions/36030650/how-to-verify-map-size-using-hamcrest

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