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

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

Source:Dropwizard.java

...431        try (Harness harness = BenchmarkTestBase.makeHarness(REPO)) {432            long start = System.currentTimeMillis();433            SymbolDescriptor descriptor = SymbolDescriptor.of(434                    ElementKind.CLASS,435                    "ExternalResource",436                    "org.junit.rules.ExternalResource",437                    "ExternalResource",438                    "org.junit.rules",439                    null440            );441442            harness.expectXReferences(descriptor, Maps.newHashMap(),443                    WorkspaceXReferencesResult.of(444                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DBIClient.java", 9, 23, 9, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),445                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DBIClient.java", 19, 31, 19, 47), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),446                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DatabaseInTimeZone.java", 3, 23, 3, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),447                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DatabaseInTimeZone.java", 13, 40, 13, 56), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),448                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DAOTestRule.java", 10, 23, 10, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),449                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DAOTestRule.java", 47, 33, 47, 49), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),450                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardAppRule.java", 13, 23, 13, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),451                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardAppRule.java", 69, 64, 69, 80), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),452                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardClientRule.java", 10, 23, 10, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),453                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardClientRule.java", 54, 42, 54, 58), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null))454                    )455            );456            LOG.info("Cold XReferences took {}", (System.currentTimeMillis() - start) / 1000.0);457        }458    }459460    @Ignore // TODO: do this in a way that doesn't send messages to a server that's received a shutdown request461    @Test(timeout = 1000)462    public void d_warmXReferences() throws Exception {463        try (Harness harness = BenchmarkTestBase.getHarness()) {464            long start = System.currentTimeMillis();465            SymbolDescriptor descriptor = SymbolDescriptor.of(466                    ElementKind.CLASS,467                    "ExternalResource",468                    "org.junit.rules.ExternalResource",469                    "ExternalResource",470                    "org.junit.rules",471                    null472            );473474            harness.expectXReferences(descriptor, Maps.newHashMap(),475                    WorkspaceXReferencesResult.of(476                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DBIClient.java", 9, 23, 9, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),477                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DBIClient.java", 19, 31, 19, 47), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),478                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DatabaseInTimeZone.java", 3, 23, 3, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),479                            ReferenceInformation.of(Location.of("file:///dropwizard-jdbi/src/test/java/io/dropwizard/jdbi/timestamps/DatabaseInTimeZone.java", 13, 40, 13, 56), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),480                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DAOTestRule.java", 10, 23, 10, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),481                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DAOTestRule.java", 47, 33, 47, 49), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),482                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardAppRule.java", 13, 23, 13, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),483                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardAppRule.java", 69, 64, 69, 80), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),484                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardClientRule.java", 10, 23, 10, 39), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null)),485                            ReferenceInformation.of(Location.of("file:///dropwizard-testing/src/main/java/io/dropwizard/testing/junit/DropwizardClientRule.java", 54, 42, 54, 58), SymbolDescriptor.of(ElementKind.CLASS, "ExternalResource", "org.junit.rules.ExternalResource", "ExternalResource", "org.junit.rules", null))486                    )487            );488            LOG.info("Warm XReferences took {}", (System.currentTimeMillis() - start) / 1000.0);489        }490    }491492    @Test(timeout = 12000)493    public void e_ReferencesToLocalVar() throws Exception {494        try (Harness harness = BenchmarkTestBase.makeHarness(REPO)) {495            long start = System.currentTimeMillis();496            harness.expectReferences("file:///dropwizard-auth/src/main/java/io/dropwizard/auth/AuthDynamicFeature.java",497                    42, 21,498                    false,499                    TextDocumentReferencesResult.of(
...

Source:ClassRule.java

...32 * all the test classes run, and disconnects after they are finished:33 * <pre>34 * &#064;RunWith(Suite.class)35 * &#064;SuiteClasses({A.class, B.class, C.class})36 * public class UsesExternalResource {37 *     public static Server myServer= new Server();38 *39 *     &#064;ClassRule40 *     public static ExternalResource resource= new ExternalResource() {41 *       &#064;Override42 *       protected void before() throws Throwable {43 *          myServer.connect();44 *      }45 *46 *      &#064;Override47 *      protected void after() {48 * 	        myServer.disconnect();49 *      }50 *   };51 * }52 * </pre>53 * <p>54 * and the same using a method55 * <pre>56 * &#064;RunWith(Suite.class)57 * &#064;SuiteClasses({A.class, B.class, C.class})58 * public class UsesExternalResource {59 *     public static Server myServer= new Server();60 *61 *     &#064;ClassRule62 *     public static ExternalResource getResource() {63 *         return new ExternalResource() {64 *             &#064;Override65 *             protected void before() throws Throwable {66 *                 myServer.connect();67 *             }68 *69 *             &#064;Override70 *             protected void after() {71 *                 myServer.disconnect();72 *             }73 *         };74 *     }75 * }76 * </pre>77 * <p>...

Source:BaseSuite.java

...12 */13package com.thoughtworks.selenium;14import java.util.logging.Logger;15import org.junit.ClassRule;16import org.junit.rules.ExternalResource;17import org.junit.rules.RuleChain;18import org.junit.rules.TestRule;19import org.openqa.selenium.environment.GlobalTestEnvironment;20import org.openqa.selenium.environment.TestEnvironment;21import org.openqa.selenium.v1.SeleniumTestEnvironment;22public class BaseSuite {23  24  private static final Logger log = Logger.getLogger(BaseSuite.class.getName());25  public static ExternalResource testEnvironment = new ExternalResource() {26    @Override27    protected void before() throws Throwable {28      log.info("Preparing test environment");29      GlobalTestEnvironment.get(SeleniumTestEnvironment.class);30    }31    @Override32    protected void after() {33      log.info("Cleaning test environment");34      TestEnvironment environment = GlobalTestEnvironment.get();35      if (environment != null) {36        environment.stop();37        GlobalTestEnvironment.set(null);38      }39    }40  };41  42  public static ExternalResource browser = new ExternalResource() {43    @Override44    protected void after() {45      log.info("Stopping browser");46      try {47        InternalSelenseTestBase.destroyDriver();48      } catch (SeleniumException ignored) {49        // Nothing sane to do50      }51    }52  };53  54  @ClassRule55  public static TestRule chain =56      RuleChain.outerRule(testEnvironment).around(browser);...

Source:ExternalResourceTest.java

...3import org.junit.Before;4import org.junit.Rule;5import org.junit.Test;6import org.junit.rules.ErrorCollector;7import org.junit.rules.ExternalResource;8/**9 * Created by caiyunwu on 2017/3/23.10 */11public class ExternalResourceTest {12    @Before13    public void setUp() throws Exception {14        System.out.println("before");15    }16    @After17    public void tearDown() throws Exception {18        System.out.println("after");19    }20    @Rule21    public final ExternalResource resource = new ExternalResource() {22        @Override23        protected void before() throws Throwable {24            System.out.println("ExternalResource before");25        }26        @Override27        protected void after() {28            System.out.println("ExternalResource after");29        }30    };31    @Test32    public void testExternalResource() throws Exception {33        System.out.println("testExternalResource");34    }35}...

ExternalResource

Using AI Code Generation

1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ExternalResource;4public class ExternalResourceTest {5    public ExternalResource resource = new ExternalResource(){6        protected void before() throws Throwable {7            System.out.println("before");8        }9        protected void after() {10            System.out.println("after");11        }12    };13    public void test() {14        System.out.println("test");15    }16}

ExternalResource

Using AI Code Generation

1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ExternalResource;4import org.junit.rules.TemporaryFolder;5import java.io.File;6import java.io.IOException;7import java.nio.file.Files;8import java.nio.file.Path;9import java.nio.file.Paths;10public class JUnitRuleExample {11    public TemporaryFolder temporaryFolder = new TemporaryFolder();12    public ExternalResource resource = new ExternalResource() {13        protected void before() throws Throwable {14            System.out.println("before");15        }16        protected void after() {17            System.out.println("after");18        }19    };20    public void testUsingTempFolder() throws IOException {21        File createdFile = temporaryFolder.newFile("test.txt");22        Path path = Paths.get(createdFile.getAbsolutePath());23        Files.write(path, "test".getBytes());24    }25}26javac -cp .;junit-4.12.jar;hamcrest-core-1.3.jar JUnitRuleExample.java27java -cp .;junit-4.12.jar;hamcrest-core-1.3.jar org.junit.runner.JUnitCore JUnitRuleExample28OK (1 test)

ExternalResource

Using AI Code Generation

1import org.junit.rules.ExternalResource;2public class ExternalResourceRuleTest {3    public ExternalResource resource = new ExternalResource() {4        protected void before() throws Throwable {5            System.out.println("before method is called");6        }7        protected void after() {8            System.out.println("after method is called");9        }10    };11    public void testExternalResource() {12        System.out.println("test method is called");13    }14}

ExternalResource

Using AI Code Generation

1import static org.junit.Assert.assertEquals;2import org.junit.Rule;3import org.junit.Test;4import org.junit.rules.ExternalResource;5public class TestExternalResource {6    public ExternalResource externalResource = new ExternalResource() {7        protected void before() throws Throwable {8            System.out.println("before called");9        }10        protected void after() {11            System.out.println("after called");12        }13    };14    public void testExternalResource() {15        assertEquals(1, 1);16    }17}

ExternalResource

Using AI Code Generation

1import org.junit.rules.ExternalResource;2import org.junit.rules.RuleChain;3import org.junit.runner.Description;4import org.junit.runners.model.Statement;5import org.junit.rules.TestRule;6public class RuleChainTest {7    public static class MyExternalResource extends ExternalResource {8        protected void before() throws Throwable {9            System.out.println("before");10        }11        protected void after() {12            System.out.println("after");13        }14    }15    public static class MyTestRule implements TestRule {16        public Statement apply(Statement base, Description description) {17            return new Statement() {18                public void evaluate() throws Throwable {19                    System.out.println("before TestRule");20                    base.evaluate();21                    System.out.println("after TestRule");22                }23            };24        }25    }26    public static class MyTestRule2 implements TestRule {27        public Statement apply(Statement base, Description description) {28            return new Statement() {29                public void evaluate() throws Throwable {30                    System.out.println("before TestRule2");31                    base.evaluate();32                    System.out.println("after TestRule2");33                }34            };35        }36    }37    public RuleChain ruleChain = RuleChain.outerRule(new MyTestRule()).around(new MyExternalResource()).around(new MyTestRule2());38    public void test() {39        System.out.println("test");40    }41}42import org.junit.rules.RuleChain;43import org.junit.rules.Test

ExternalResource

Using AI Code Generation

1import static org.junit.Assert.*;2import java.io.*;3import java.net.*;4import org.junit.*;5import org.junit.rules.*;6import org.junit.runner.*;7public class TestExternalResource {8	public ExternalResource resource = new ExternalResource() {9		protected void before() throws Throwable {10			InputStream in = url.openStream();11			FileOutputStream out = new FileOutputStream("example.txt");12			int b;13			while((b = in.read()) != -1) {14				out.write(b);15			}16			out.close();17			in.close();18		}19		protected void after() {20			File file = new File("example.txt");21			file.delete();22		}23	};24	public void test() {25		File file = new File("example.txt");26		assertTrue(file.exists());27	}28}29import org.junit.runner.*;30public class TestExternalResourceTest {31	public static void main(String[] args) {32		Result result = JUnitCore.runClasses(TestExternalResource.class);33		for(Failure failure : result.getFailures()) {34			System.out.println(failure.toString());35		}36		System.out.println(result.wasSuccessful());37	}38}39import org.junit.runner.*;40public class TestExternalResourceTest {41	public static void main(String[] args) {42		Result result = JUnitCore.runClasses(TestExternalResource.class);43		for(Failure failure : result.getFailures()) {44			System.out.println(failure.toString());45		}46		System.out.println(result.wasSuccessful());47	}48}49import static org.junit.Assert.*;50import org.junit

Source: Easy way to get a test file into JUnit

1Map hashmap = new HashMap();23Map map = Collections.SyncronizedMap(hashmap);4

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.