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How to use assertThat method of org.junit.Assert class

Best junit code snippet using org.junit.Assert.assertThat

Source:AssertionsWithoutMessageCheck.java

...10import org.junit.jupiter.api.function.Executable;11import static checks.MyAbstractIsEqualTo.isEqualTo;12class AssertionsWithoutMessageCheck {13  void foo() {14    org.assertj.core.api.Assertions.assertThat("").usingComparator(null).as("a").isEqualTo(222); // Compliant15    org.junit.Assert.assertTrue(true); // Noncompliant [[sc=22;ec=32]] {{Add a message to this assertion.}}16    org.junit.Assert.assertTrue("message", true);17    org.junit.Assert.assertTrue(1 > 2); // Noncompliant {{Add a message to this assertion.}}18    org.junit.Assert.assertFalse(false); // Noncompliant19    org.junit.Assert.assertFalse("message", false);20    org.junit.Assert.assertEquals("message", "foo", "bar");21    org.junit.Assert.assertEquals("foo", "bar"); // Noncompliant22    junit.framework.Assert.assertTrue(true); // Noncompliant23    junit.framework.Assert.assertTrue("message", true);24    junit.framework.Assert.assertEquals("message", "foo", "bar");25    junit.framework.Assert.assertEquals("message", "foo", "bar");26    junit.framework.Assert.assertEquals("foo", "bar"); // Noncompliant27    junit.framework.Assert.assertNotNull("foo", "bar");28    junit.framework.Assert.assertNotNull("foo"); // Noncompliant29    org.fest.assertions.Assertions.assertThat(true).isTrue();// Noncompliant {{Add a message to this assertion chain before the predicate method.}}30    org.fest.assertions.Assertions.assertThat(true).as("verifying the truth").isTrue();31    org.fest.assertions.Assertions.assertThat(true).as(new BasicDescription("description")).isTrue();32    org.fest.assertions.Assertions.assertThat(true).describedAs("verifying the truth").isTrue(); // compliant - describedAs is an alias for as33    org.fest.assertions.Assertions.assertThat(true).describedAs(new BasicDescription("description"));34    org.fest.assertions.Assertions.assertThat(true).overridingErrorMessage("error message").isTrue();35    org.fest.assertions.Assertions.assertThat("").as("Message").isEqualTo("");36    org.fest.assertions.Assertions.assertThat("").isEqualTo("").as("Message"); // Noncompliant37    org.assertj.core.api.Assertions.assertThat(true).isTrue(); // Noncompliant38    org.assertj.core.api.Assertions.assertThatObject(true).isEqualTo(""); // Noncompliant39    org.assertj.core.api.Assertions.assertThat(true).as("verifying the truth").isTrue();40    org.assertj.core.api.Assertions.assertThat(true).as("verifying the truth", new Object()).isTrue();41    org.assertj.core.api.Assertions.assertThat(true).as(new TextDescription("verifying the truth")).isTrue();42    org.assertj.core.api.Assertions.assertThat(true).describedAs("verifying the truth").isTrue(); // compliant - describedAs is an alias for as43    org.assertj.core.api.Assertions.assertThat(true).describedAs("verifying the truth", new Object()).isTrue();44    org.assertj.core.api.Assertions.assertThat(true).describedAs(new TextDescription("verifying the truth")).isTrue();45    org.assertj.core.api.Assertions.assertThat(true).withFailMessage("fail message").isTrue();46    org.assertj.core.api.Assertions.assertThat(true).withFailMessage("fail message", new Object()).isTrue();47    org.assertj.core.api.Assertions.assertThat(true).overridingErrorMessage("fail message").isTrue();48    org.assertj.core.api.Assertions.assertThat(true).overridingErrorMessage("fail message", new Object()).isTrue();49    org.assertj.core.api.Assertions.assertThat("").as("Message").isEqualTo("");50    org.assertj.core.api.Assertions.assertThat("").isEqualTo("").as("Message"); // Noncompliant [[sc=52;ec=61]] {{Add a message to this assertion chain before the predicate method.}}51    org.assertj.core.api.Assertions.assertThat("").matches("x").matches("y"); // Noncompliant [[sc=52;ec=59]]52    org.assertj.core.api.AssertionsForClassTypes.assertThat("").isEqualTo(""); // Noncompliant53    org.assertj.core.api.Assertions.assertThat("").usingComparator(null).as("a").isEqualTo(222); // Compliant54    org.assertj.core.api.Assertions.assertThat("").as("message").usingComparator(null).isEqualTo(222); // Compliant55    org.assertj.core.api.Assertions.assertThat("").isEqualTo("1").usingComparator(null).isEqualTo("2"); // Noncompliant [[sc=52;ec=61]]56    org.assertj.core.api.Assertions.assertThat("").usingComparator(null).isEqualTo(222); // Noncompliant57    org.assertj.core.api.Assertions.assertThat(new Object()).as("message").extracting("field").isEqualTo(222); // Compliant58    org.assertj.core.api.Assertions.assertThat(new Object()).extracting("field").isEqualTo(222); // Noncompliant59    org.assertj.core.api.Assertions.assertThat(new ArrayList<>()).as("message").filteredOn("s", "e").isEqualTo(222); // Compliant60    org.assertj.core.api.Assertions.assertThat(new ArrayList<>()).filteredOn("s", "e").isEqualTo(222); // Noncompliant61    AbstractStringAssert variableAssert = org.assertj.core.api.Assertions.assertThat("").as("message");62    variableAssert.isEqualTo("");  // Compliant63    AbstractStringAssert variableAssertWithoutMessage = org.assertj.core.api.Assertions.assertThat("");64    variableAssertWithoutMessage.isEqualTo("");  // FN, we can not be sure that the assertion provide a message65    // Compliant, not used as expected (for coverage)66    isEqualTo();67    MyAbstractIsEqualTo.isEqualTo();68    org.junit.Assert.assertThat("foo", null); // Noncompliant {{Add a message to this assertion.}}69    org.junit.Assert.assertThat("foo", "bar", null);70    org.junit.Assert.assertThat("foo", new Integer(1), null);71    junit.framework.Assert.assertNotSame("foo", "bar"); // Noncompliant72    junit.framework.Assert.assertNotSame("foo", "foo", "bar");73    junit.framework.Assert.assertSame("foo", "bar"); // Noncompliant74    junit.framework.Assert.assertSame("foo", "foo", "bar");75    org.junit.Assert.fail(); // Noncompliant76    org.junit.Assert.fail("Foo");77    junit.framework.Assert.fail(); // Noncompliant78    junit.framework.Assert.fail("Foo");79    org.fest.assertions.Fail.fail(); // Noncompliant80    org.fest.assertions.Fail.fail("foo");81    org.fest.assertions.Fail.fail("foo", null);82    org.fest.assertions.Fail.failure("foo");83  }84  void junit5() {...

Source:DiscoveryRequestCreatorTests.java

...10package org.junit.platform.console.tasks;11import static java.util.Arrays.asList;12import static java.util.Collections.singletonList;13import static java.util.stream.Collectors.toMap;14import static org.assertj.core.api.Assertions.assertThat;15import static org.assertj.core.api.Assertions.entry;16import static org.junit.jupiter.api.Assertions.assertThrows;17import static org.junit.platform.engine.discovery.ClassNameFilter.STANDARD_INCLUDE_PATTERN;18import java.io.File;19import java.net.URI;20import java.nio.file.Paths;21import java.util.List;22import java.util.Map;23import java.util.Map.Entry;24import java.util.stream.Stream;25import org.junit.jupiter.api.Test;26import org.junit.platform.commons.util.PreconditionViolationException;27import org.junit.platform.console.options.CommandLineOptions;28import org.junit.platform.engine.ConfigurationParameters;29import org.junit.platform.engine.discovery.ClassNameFilter;30import org.junit.platform.engine.discovery.ClassSelector;31import org.junit.platform.engine.discovery.ClasspathResourceSelector;32import org.junit.platform.engine.discovery.ClasspathRootSelector;33import org.junit.platform.engine.discovery.DirectorySelector;34import org.junit.platform.engine.discovery.FileSelector;35import org.junit.platform.engine.discovery.MethodSelector;36import org.junit.platform.engine.discovery.PackageNameFilter;37import org.junit.platform.engine.discovery.PackageSelector;38import org.junit.platform.engine.discovery.UriSelector;39import org.junit.platform.launcher.EngineFilter;40import org.junit.platform.launcher.LauncherDiscoveryRequest;41import org.junit.platform.launcher.PostDiscoveryFilter;42/**43 * @since 1.044 */45class DiscoveryRequestCreatorTests {46	private final CommandLineOptions options = new CommandLineOptions();47	@Test48	void convertsScanClasspathOptionWithoutExplicitRootDirectories() {49		options.setScanClasspath(true);50		LauncherDiscoveryRequest request = convert();51		List<ClasspathRootSelector> classpathRootSelectors = request.getSelectorsByType(ClasspathRootSelector.class);52		// @formatter:off53		assertThat(classpathRootSelectors).extracting(ClasspathRootSelector::getClasspathRoot)54				.hasAtLeastOneElementOfType(URI.class)55				.doesNotContainNull();56		// @formatter:on57	}58	@Test59	void convertsScanClasspathOptionWithExplicitRootDirectories() {60		options.setScanClasspath(true);61		options.setSelectedClasspathEntries(asList(Paths.get("."), Paths.get("..")));62		LauncherDiscoveryRequest request = convert();63		List<ClasspathRootSelector> classpathRootSelectors = request.getSelectorsByType(ClasspathRootSelector.class);64		// @formatter:off65		assertThat(classpathRootSelectors).extracting(ClasspathRootSelector::getClasspathRoot)66				.containsExactly(new File(".").toURI(), new File("..").toURI());67		// @formatter:on68	}69	@Test70	void convertsScanClasspathOptionWithAdditionalClasspathEntries() {71		options.setScanClasspath(true);72		options.setAdditionalClasspathEntries(asList(Paths.get("."), Paths.get("..")));73		LauncherDiscoveryRequest request = convert();74		List<ClasspathRootSelector> classpathRootSelectors = request.getSelectorsByType(ClasspathRootSelector.class);75		// @formatter:off76		assertThat(classpathRootSelectors).extracting(ClasspathRootSelector::getClasspathRoot)77			.contains(new File(".").toURI(), new File("..").toURI());78		// @formatter:on79	}80	@Test81	void doesNotSupportScanClasspathAndExplicitSelectors() {82		options.setScanClasspath(true);83		options.setSelectedClasses(singletonList("SomeTest"));84		Throwable cause = assertThrows(PreconditionViolationException.class, this::convert);85		assertThat(cause).hasMessageContaining("not supported");86	}87	@Test88	void convertsDefaultIncludeClassNamePatternOption() {89		options.setScanClasspath(true);90		LauncherDiscoveryRequest request = convert();91		List<ClassNameFilter> filter = request.getFiltersByType(ClassNameFilter.class);92		assertThat(filter).hasSize(1);93		assertThat(filter.get(0).toString()).contains(STANDARD_INCLUDE_PATTERN);94	}95	@Test96	void convertsExplicitIncludeClassNamePatternOption() {97		options.setScanClasspath(true);98		options.setIncludedClassNamePatterns(asList("Foo.*Bar", "Bar.*Foo"));99		LauncherDiscoveryRequest request = convert();100		List<ClassNameFilter> filter = request.getFiltersByType(ClassNameFilter.class);101		assertThat(filter).hasSize(1);102		assertThat(filter.get(0).toString()).contains("Foo.*Bar");103		assertThat(filter.get(0).toString()).contains("Bar.*Foo");104	}105	@Test106	void convertsExcludeClassNamePatternOption() {107		options.setScanClasspath(true);108		options.setExcludedClassNamePatterns(asList("Foo.*Bar", "Bar.*Foo"));109		LauncherDiscoveryRequest request = convert();110		List<ClassNameFilter> filter = request.getFiltersByType(ClassNameFilter.class);111		assertThat(filter).hasSize(2);112		assertThat(filter.get(1).toString()).contains("Foo.*Bar");113		assertThat(filter.get(1).toString()).contains("Bar.*Foo");114	}115	@Test116	void convertsPackageOptions() {117		options.setScanClasspath(true);118		options.setIncludedPackages(asList("org.junit.included1", "org.junit.included2", "org.junit.included3"));119		options.setExcludedPackages(asList("org.junit.excluded1"));120		LauncherDiscoveryRequest request = convert();121		List<PackageNameFilter> packageNameFilters = request.getFiltersByType(PackageNameFilter.class);122		assertThat(packageNameFilters).hasSize(2);123		assertThat(packageNameFilters.get(0).toString()).contains("org.junit.included1");124		assertThat(packageNameFilters.get(0).toString()).contains("org.junit.included2");125		assertThat(packageNameFilters.get(0).toString()).contains("org.junit.included3");126		assertThat(packageNameFilters.get(1).toString()).contains("org.junit.excluded1");127	}128	@Test129	void convertsTagOptions() {130		options.setScanClasspath(true);131		options.setIncludedTagExpressions(asList("fast", "medium", "slow"));132		options.setExcludedTagExpressions(asList("slow"));133		LauncherDiscoveryRequest request = convert();134		List<PostDiscoveryFilter> postDiscoveryFilters = request.getPostDiscoveryFilters();135		assertThat(postDiscoveryFilters).hasSize(2);136		assertThat(postDiscoveryFilters.get(0).toString()).contains("TagFilter");137		assertThat(postDiscoveryFilters.get(1).toString()).contains("TagFilter");138	}139	@Test140	void convertsEngineOptions() {141		options.setScanClasspath(true);142		options.setIncludedEngines(asList("engine1", "engine2", "engine3"));143		options.setExcludedEngines(singletonList("engine2"));144		LauncherDiscoveryRequest request = convert();145		List<EngineFilter> engineFilters = request.getEngineFilters();146		assertThat(engineFilters).hasSize(2);147		assertThat(engineFilters.get(0).toString()).contains("includes", "[engine1, engine2, engine3]");148		assertThat(engineFilters.get(1).toString()).contains("excludes", "[engine2]");149	}150	@Test151	void convertsUriSelectors() {152		options.setSelectedUris(asList(URI.create("a"), URI.create("b")));153		LauncherDiscoveryRequest request = convert();154		List<UriSelector> uriSelectors = request.getSelectorsByType(UriSelector.class);155		assertThat(uriSelectors).extracting(UriSelector::getUri).containsExactly(URI.create("a"), URI.create("b"));156	}157	@Test158	void convertsFileSelectors() {159		options.setSelectedFiles(asList("foo.txt", "bar.csv"));160		LauncherDiscoveryRequest request = convert();161		List<FileSelector> fileSelectors = request.getSelectorsByType(FileSelector.class);162		assertThat(fileSelectors).extracting(FileSelector::getRawPath).containsExactly("foo.txt", "bar.csv");163	}164	@Test165	void convertsDirectorySelectors() {166		options.setSelectedDirectories(asList("foo/bar", "bar/qux"));167		LauncherDiscoveryRequest request = convert();168		List<DirectorySelector> directorySelectors = request.getSelectorsByType(DirectorySelector.class);169		assertThat(directorySelectors).extracting(DirectorySelector::getRawPath).containsExactly("foo/bar", "bar/qux");170	}171	@Test172	void convertsPackageSelectors() {173		options.setSelectedPackages(asList("com.acme.foo", "com.example.bar"));174		LauncherDiscoveryRequest request = convert();175		List<PackageSelector> packageSelectors = request.getSelectorsByType(PackageSelector.class);176		assertThat(packageSelectors).extracting(PackageSelector::getPackageName).containsExactly("com.acme.foo",177			"com.example.bar");178	}179	@Test180	void convertsClassSelectors() {181		options.setSelectedClasses(asList("com.acme.Foo", "com.example.Bar"));182		LauncherDiscoveryRequest request = convert();183		List<ClassSelector> classSelectors = request.getSelectorsByType(ClassSelector.class);184		assertThat(classSelectors).extracting(ClassSelector::getClassName).containsExactly("com.acme.Foo",185			"com.example.Bar");186	}187	@Test188	void convertsMethodSelectors() {189		options.setSelectedMethods(asList("com.acme.Foo#m()", "com.example.Bar#method(java.lang.Object)"));190		LauncherDiscoveryRequest request = convert();191		List<MethodSelector> methodSelectors = request.getSelectorsByType(MethodSelector.class);192		assertThat(methodSelectors).hasSize(2);193		assertThat(methodSelectors.get(0).getClassName()).isEqualTo("com.acme.Foo");194		assertThat(methodSelectors.get(0).getMethodName()).isEqualTo("m");195		assertThat(methodSelectors.get(0).getMethodParameterTypes()).isEqualTo("");196		assertThat(methodSelectors.get(1).getClassName()).isEqualTo("com.example.Bar");197		assertThat(methodSelectors.get(1).getMethodName()).isEqualTo("method");198		assertThat(methodSelectors.get(1).getMethodParameterTypes()).isEqualTo("java.lang.Object");199	}200	@Test201	void convertsClasspathResourceSelectors() {202		options.setSelectedClasspathResources(asList("foo.csv", "com/example/bar.json"));203		LauncherDiscoveryRequest request = convert();204		List<ClasspathResourceSelector> classpathResourceSelectors = request.getSelectorsByType(205			ClasspathResourceSelector.class);206		assertThat(classpathResourceSelectors).extracting(207			ClasspathResourceSelector::getClasspathResourceName).containsExactly("foo.csv", "com/example/bar.json");208	}209	@Test210	void convertsConfigurationParameters() {211		options.setScanClasspath(true);212		options.setConfigurationParameters(mapOf(entry("foo", "bar"), entry("baz", "true")));213		LauncherDiscoveryRequest request = convert();214		ConfigurationParameters configurationParameters = request.getConfigurationParameters();215		assertThat(configurationParameters.size()).isEqualTo(2);216		assertThat(configurationParameters.get("foo")).contains("bar");217		assertThat(configurationParameters.getBoolean("baz")).contains(true);218	}219	private LauncherDiscoveryRequest convert() {220		DiscoveryRequestCreator creator = new DiscoveryRequestCreator();221		return creator.toDiscoveryRequest(options);222	}223	@SafeVarargs224	@SuppressWarnings("varargs")225	private static <K, V> Map<K, V> mapOf(Entry<K, V>... entries) {226		return Stream.of(entries).collect(toMap(Entry::getKey, Entry::getValue));227	}228}...

Source:TestWatcherTest.java

1package org.junit.tests.experimental.rules;2import static junit.framework.Assert.fail;3import static org.hamcrest.CoreMatchers.is;4import static org.junit.Assert.assertThat;5import static org.junit.Assume.assumeTrue;6import static org.junit.experimental.results.PrintableResult.testResult;7import static org.junit.experimental.results.ResultMatchers.failureCountIs;8import static org.junit.experimental.results.ResultMatchers.hasFailureContaining;9import static org.junit.runner.JUnitCore.runClasses;10import org.junit.Rule;11import org.junit.Test;12import org.junit.experimental.results.PrintableResult;13import org.junit.internal.AssumptionViolatedException;14import org.junit.rules.TestRule;15import org.junit.rules.TestWatcher;16import org.junit.runner.Description;17public class TestWatcherTest {18    public static class ViolatedAssumptionTest {19        private static StringBuilder watchedLog = new StringBuilder();20        @Rule21        public TestRule watcher = new LoggingTestWatcher(watchedLog);22        @Test23        public void succeeds() {24            assumeTrue(false);25        }26    }27    @Test28    public void neitherLogSuccessNorFailedForViolatedAssumption() {29        ViolatedAssumptionTest.watchedLog = new StringBuilder();30        runClasses(ViolatedAssumptionTest.class);31        assertThat(ViolatedAssumptionTest.watchedLog.toString(),32                is("starting finished "));33    }34    public static class TestWatcherSkippedThrowsExceptionTest {35        @Rule36        public TestRule watcher = new TestWatcher() {37            @Override38            protected void skipped(AssumptionViolatedException e, Description description) {39                throw new RuntimeException("watcher failure");40            }41        };42        @Test43        public void fails() {44            throw new AssumptionViolatedException("test failure");45        }46    }47    @Test48    public void testWatcherSkippedThrowsException() {49        PrintableResult result = testResult(TestWatcherSkippedThrowsExceptionTest.class);50        assertThat(result, failureCountIs(2));51        assertThat(result, hasFailureContaining("test failure"));52        assertThat(result, hasFailureContaining("watcher failure"));53    }54    public static class FailingTest {55        private static StringBuilder watchedLog = new StringBuilder();56        @Rule57        public TestRule watcher = new LoggingTestWatcher(watchedLog);58        @Test59        public void succeeds() {60            fail();61        }62    }63    @Test64    public void logFailingTest() {65        FailingTest.watchedLog = new StringBuilder();66        runClasses(FailingTest.class);67        assertThat(FailingTest.watchedLog.toString(),68                is("starting failed finished "));69    }70    public static class TestWatcherFailedThrowsExceptionTest {71        @Rule72        public TestRule watcher = new TestWatcher() {73            @Override74            protected void failed(Throwable e, Description description) {75                throw new RuntimeException("watcher failure");76            }77        };78        @Test79        public void fails() {80            throw new IllegalArgumentException("test failure");81        }82    }83    @Test84    public void testWatcherFailedThrowsException() {85        PrintableResult result = testResult(TestWatcherFailedThrowsExceptionTest.class);86        assertThat(result, failureCountIs(2));87        assertThat(result, hasFailureContaining("test failure"));88        assertThat(result, hasFailureContaining("watcher failure"));89    }90    public static class TestWatcherStartingThrowsExceptionTest {91        @Rule92        public TestRule watcher = new TestWatcher() {93            @Override94            protected void starting(Description description) {95                throw new RuntimeException("watcher failure");96            }97        };98        @Test99        public void fails() {100            throw new IllegalArgumentException("test failure");101        }102    }103    @Test104    public void testWatcherStartingThrowsException() {105        PrintableResult result = testResult(TestWatcherStartingThrowsExceptionTest.class);106        assertThat(result, failureCountIs(2));107        assertThat(result, hasFailureContaining("test failure"));108        assertThat(result, hasFailureContaining("watcher failure"));109    }110    public static class TestWatcherFailedAndFinishedThrowsExceptionTest {111        @Rule112        public TestRule watcher = new TestWatcher() {113            @Override114            protected void failed(Throwable t, Description description) {115                throw new RuntimeException("watcher failed failure");116            }117            @Override118            protected void finished(Description description) {119                throw new RuntimeException("watcher finished failure");120            }121        };122        @Test123        public void fails() {124            throw new IllegalArgumentException("test failure");125        }126    }127    @Test128    public void testWatcherFailedAndFinishedThrowsException() {129        PrintableResult result = testResult(TestWatcherFailedAndFinishedThrowsExceptionTest.class);130        assertThat(result, failureCountIs(3));131        assertThat(result, hasFailureContaining("test failure"));132        assertThat(result, hasFailureContaining("watcher failed failure"));133        assertThat(result, hasFailureContaining("watcher finished failure"));134    }135}...

Source:StopwatchTest.java

...9import org.junit.runner.Result;10import static java.util.concurrent.TimeUnit.MILLISECONDS;11import static org.hamcrest.core.Is.is;12import static org.junit.Assert.assertEquals;13import static org.junit.Assert.assertThat;14import static org.junit.Assume.assumeTrue;15import static org.junit.Assert.assertTrue;16import static org.junit.Assert.fail;17import static org.junit.Assert.assertNotEquals;18/**19 * @author tibor1720 * @since 4.1221 */22public class StopwatchTest {23    private static enum TestStatus { SUCCEEDED, FAILED, SKIPPED }24    private static Record fRecord;25    private static Record fFinishedRecord;26    private static class Record {27        final long fDuration;28        final String fName;29        final TestStatus fStatus;30        Record() {31            this(0, null, null);32        }33        Record(long duration, String name) {34            this(duration, null, name);35        }36        Record(long duration, TestStatus status, String name) {37            fDuration= duration;38            fStatus= status;39            fName= name;40        }41    }42    public static abstract class AbstractStopwatchTest {43        @Rule44        public final Stopwatch fStopwatch= new Stopwatch() {45            @Override46            protected void succeeded(long nanos, Description description) {47                StopwatchTest.fRecord= new Record(nanos, TestStatus.SUCCEEDED, description.getMethodName());48            }49            @Override50            protected void failed(long nanos, Throwable e, Description description) {51                StopwatchTest.fRecord= new Record(nanos, TestStatus.FAILED, description.getMethodName());52            }53            @Override54            protected void skipped(long nanos, AssumptionViolatedException e, Description description) {55                StopwatchTest.fRecord= new Record(nanos, TestStatus.SKIPPED, description.getMethodName());56            }57            @Override58            protected void finished(long nanos, Description description) {59                StopwatchTest.fFinishedRecord= new Record(nanos, description.getMethodName());60            }61        };62    }63    public static class SuccessfulTest extends AbstractStopwatchTest {64        @Test65        public void successfulTest() {66        }67    }68    public static class FailedTest extends AbstractStopwatchTest {69        @Test70        public void failedTest() {71            fail();72        }73    }74    public static class SkippedTest extends AbstractStopwatchTest {75        @Test76        public void skippedTest() {77            assumeTrue(false);78        }79    }80    public static class WrongDurationTest extends AbstractStopwatchTest {81        @Test82        public void wrongDuration() throws InterruptedException {83            Thread.sleep(500L);84            assertNotEquals(fStopwatch.runtime(MILLISECONDS), 300d, 100d);85        }86    }87    public static class DurationTest extends AbstractStopwatchTest {88        @Test89        public void duration() throws InterruptedException {90            Thread.sleep(300L);91            assertEquals(300d, fStopwatch.runtime(MILLISECONDS), 100d);92            Thread.sleep(500L);93            assertEquals(800d, fStopwatch.runtime(MILLISECONDS), 250d);94        }95    }96    @Before97    public void init() {98        fRecord= new Record();99        fFinishedRecord= new Record();100    }101    @Test102    public void succeeded() {103        Result result= JUnitCore.runClasses(SuccessfulTest.class);104        assertEquals(0, result.getFailureCount());105        assertThat(fRecord.fName, is("successfulTest"));106        assertThat(fRecord.fName, is(fFinishedRecord.fName));107        assertThat(fRecord.fStatus, is(TestStatus.SUCCEEDED));108        assertTrue("timeSpent > 0", fRecord.fDuration > 0);109        assertThat(fRecord.fDuration, is(fFinishedRecord.fDuration));110    }111    @Test112    public void failed() {113        Result result= JUnitCore.runClasses(FailedTest.class);114        assertEquals(1, result.getFailureCount());115        assertThat(fRecord.fName, is("failedTest"));116        assertThat(fRecord.fName, is(fFinishedRecord.fName));117        assertThat(fRecord.fStatus, is(TestStatus.FAILED));118        assertTrue("timeSpent > 0", fRecord.fDuration > 0);119        assertThat(fRecord.fDuration, is(fFinishedRecord.fDuration));120    }121    @Test122    public void skipped() {123        Result result= JUnitCore.runClasses(SkippedTest.class);124        assertEquals(0, result.getFailureCount());125        assertThat(fRecord.fName, is("skippedTest"));126        assertThat(fRecord.fName, is(fFinishedRecord.fName));127        assertThat(fRecord.fStatus, is(TestStatus.SKIPPED));128        assertTrue("timeSpent > 0", fRecord.fDuration > 0);129        assertThat(fRecord.fDuration, is(fFinishedRecord.fDuration));130    }131    @Test132    public void wrongDuration() {133        Result result= JUnitCore.runClasses(WrongDurationTest.class);134        assertTrue(result.wasSuccessful());135    }136    @Test137    public void duration() {138        Result result= JUnitCore.runClasses(DurationTest.class);139        assertTrue(result.wasSuccessful());140    }141}...

Source:VerifierRuleTest.java

1package org.junit.tests.experimental.rules;2import static org.hamcrest.CoreMatchers.is;3import static org.junit.Assert.assertEquals;4import static org.junit.Assert.assertThat;5import static org.junit.experimental.results.PrintableResult.testResult;6import static org.junit.experimental.results.ResultMatchers.hasFailureContaining;7import static org.junit.experimental.results.ResultMatchers.isSuccessful;8import java.util.concurrent.Callable;9import org.junit.Rule;10import org.junit.Test;11import org.junit.experimental.results.PrintableResult;12import org.junit.rules.ErrorCollector;13import org.junit.rules.Verifier;14public class VerifierRuleTest {15    public static class UsesErrorCollector {16        @Rule17        public ErrorCollector collector = new ErrorCollector();18        @Test19        public void example() {20            collector.addError(new Throwable("message"));21        }22    }23    @Test24    public void usedErrorCollectorShouldFail() {25        assertThat(testResult(UsesErrorCollector.class), hasFailureContaining("message"));26    }27    public static class UsesErrorCollectorTwice {28        @Rule29        public ErrorCollector collector = new ErrorCollector();30        @Test31        public void example() {32            collector.addError(new Throwable("first thing went wrong"));33            collector.addError(new Throwable("second thing went wrong"));34        }35    }36    @Test37    public void usedErrorCollectorTwiceShouldFail() {38        PrintableResult testResult = testResult(UsesErrorCollectorTwice.class);39        assertThat(testResult, hasFailureContaining("first thing went wrong"));40        assertThat(testResult, hasFailureContaining("second thing went wrong"));41    }42    public static class UsesErrorCollectorCheckThat {43        @Rule44        public ErrorCollector collector = new ErrorCollector();45        @Test46        public void example() {47            collector.checkThat(3, is(4));48            collector.checkThat(5, is(6));49            collector.checkThat("reason 1", 7, is(8));50            collector.checkThat("reason 2", 9, is(16));51        }52    }53    @Test54    public void usedErrorCollectorCheckThatShouldFail() {55        PrintableResult testResult = testResult(UsesErrorCollectorCheckThat.class);56        assertThat(testResult, hasFailureContaining("was <3>"));57        assertThat(testResult, hasFailureContaining("was <5>"));58        assertThat(testResult, hasFailureContaining("reason 1"));59        assertThat(testResult, hasFailureContaining("was <7>"));60        assertThat(testResult, hasFailureContaining("reason 2"));61        assertThat(testResult, hasFailureContaining("was <9>"));62    }63    public static class UsesErrorCollectorCheckSucceeds {64        @Rule65        public ErrorCollector collector = new ErrorCollector();66        @Test67        public void example() {68            collector.checkSucceeds(new Callable<Object>() {69                public Object call() throws Exception {70                    throw new RuntimeException("first!");71                }72            });73            collector.checkSucceeds(new Callable<Object>() {74                public Object call() throws Exception {75                    throw new RuntimeException("second!");76                }77            });78        }79    }80    @Test81    public void usedErrorCollectorCheckSucceedsShouldFail() {82        PrintableResult testResult = testResult(UsesErrorCollectorCheckSucceeds.class);83        assertThat(testResult, hasFailureContaining("first!"));84        assertThat(testResult, hasFailureContaining("second!"));85    }86    public static class UsesErrorCollectorCheckSucceedsPasses {87        @Rule88        public ErrorCollector collector = new ErrorCollector();89        @Test90        public void example() {91            assertEquals(3, collector.checkSucceeds(new Callable<Object>() {92                public Object call() throws Exception {93                    return 3;94                }95            }));96        }97    }98    @Test99    public void usedErrorCollectorCheckSucceedsShouldPass() {100        PrintableResult testResult = testResult(UsesErrorCollectorCheckSucceedsPasses.class);101        assertThat(testResult, isSuccessful());102    }103    private static String sequence;104    public static class UsesVerifier {105        @Rule106        public Verifier collector = new Verifier() {107            @Override108            protected void verify() {109                sequence += "verify ";110            }111        };112        @Test113        public void example() {114            sequence += "test ";115        }116    }117    @Test118    public void verifierRunsAfterTest() {119        sequence = "";120        assertThat(testResult(UsesVerifier.class), isSuccessful());121        assertEquals("test verify ", sequence);122    }123}...

Source:AssumptionTest.java

1package org.junit.tests.experimental;23import static org.hamcrest.CoreMatchers.is;4import static org.junit.Assert.assertThat;5import static org.junit.Assert.fail;6import static org.junit.Assume.assumeNoException;7import static org.junit.Assume.assumeNotNull;8import static org.junit.Assume.assumeThat;9import static org.junit.Assume.assumeTrue;10import static org.junit.experimental.results.PrintableResult.testResult;11import static org.junit.experimental.results.ResultMatchers.isSuccessful;12import static org.junit.internal.matchers.StringContains.containsString;13import org.junit.Assume;14import org.junit.Before;15import org.junit.BeforeClass;16import org.junit.Test;17import org.junit.internal.AssumptionViolatedException;18import org.junit.runner.JUnitCore;19import org.junit.runner.Result;20import org.junit.runner.notification.Failure;21import org.junit.runner.notification.RunListener;2223public class AssumptionTest {24	public static class HasFailingAssumption {25		@Test26		public void assumptionsFail() {27			assumeThat(3, is(4));28			fail();29		}30	}3132	@Test33	public void failedAssumptionsMeanPassing() {34		Result result= JUnitCore.runClasses(HasFailingAssumption.class);35		assertThat(result.getRunCount(), is(1));36		assertThat(result.getIgnoreCount(), is(0));37		assertThat(result.getFailureCount(), is(0));38	}3940	private static int assumptionFailures= 0;41	@Test42	public void failedAssumptionsCanBeDetectedByListeners() {43		assumptionFailures= 0;44		JUnitCore core= new JUnitCore();45		core.addListener(new RunListener() {46			@Override47			public void testAssumptionFailure(Failure failure) {48				assumptionFailures++;49			}50		});51		core.run(HasFailingAssumption.class);52		53		assertThat(assumptionFailures, is(1));54	}5556	public static class HasPassingAssumption {57		@Test58		public void assumptionsFail() {59			assumeThat(3, is(3));60			fail();61		}62	}6364	@Test65	public void passingAssumptionsScootThrough() {66		Result result= JUnitCore.runClasses(HasPassingAssumption.class);67		assertThat(result.getRunCount(), is(1));68		assertThat(result.getIgnoreCount(), is(0));69		assertThat(result.getFailureCount(), is(1));70	}7172	@Test(expected= AssumptionViolatedException.class)73	public void assumeThatWorks() {74		assumeThat(1, is(2));75	}7677	@Test78	public void assumeThatPasses() {79		assumeThat(1, is(1));80		assertCompletesNormally();81	}8283	@Test84	public void assumeThatPassesOnStrings() {85		assumeThat("x", is("x"));86		assertCompletesNormally();87	}8889	@Test(expected= AssumptionViolatedException.class)90	public void assumeNotNullThrowsException() {91		Object[] objects= { 1, 2, null };92		assumeNotNull(objects);93	}9495	@Test96	public void assumeNotNullPasses() {97		Object[] objects= { 1, 2 };98		assumeNotNull(objects);99		assertCompletesNormally();100	}101102	@Test103	public void assumeNotNullIncludesParameterList() {104		try {105			Object[] objects= { 1, 2, null };106			assumeNotNull(objects);107		} catch (AssumptionViolatedException e) {108			assertThat(e.getMessage(), containsString("1, 2, null"));109		} catch (Exception e) {110			fail("Should have thrown AssumptionViolatedException");111		}112	}113	@Test114	public void assumeNoExceptionThrows() {115		final Throwable exception= new NullPointerException();116		try {117			assumeNoException(exception);118			fail("Should have thrown exception");119		} catch (AssumptionViolatedException e) {120			assertThat(e.getCause(), is(exception));121		}122	}123124	private void assertCompletesNormally() {125	}126127	@Test(expected=AssumptionViolatedException.class) public void assumeTrueWorks() {128		Assume.assumeTrue(false);129	}130131	public static class HasFailingAssumeInBefore {132		@Before public void checkForSomethingThatIsntThere() {133			assumeTrue(false);134		}135136		@Test public void failing() {137			fail();138		}139	}140141	@Test public void failingAssumptionInBeforePreventsTestRun() {142		assertThat(testResult(HasFailingAssumeInBefore.class), isSuccessful());143	}144145	public static class HasFailingAssumeInBeforeClass {146		@BeforeClass public static void checkForSomethingThatIsntThere() {147			assumeTrue(false);148		}149150		@Test public void failing() {151			fail();152		}153	}154155	@Test public void failingAssumptionInBeforeClassIgnoresClass() {156		assertThat(testResult(HasFailingAssumeInBeforeClass.class), isSuccessful());157	}158159	public static class AssumptionFailureInConstructor {160		public AssumptionFailureInConstructor() {161			assumeTrue(false);162		}163164		@Test public void shouldFail() {165			fail();166		}167	}168169	@Test public void failingAssumptionInConstructorIgnoresClass() {170		assertThat(testResult(AssumptionFailureInConstructor.class), isSuccessful());171	}172}
...

Source:TagExpressionsTests.java

...7 *8 * https://www.eclipse.org/legal/epl-v20.html9 */10package org.junit.platform.launcher.tagexpression;11import static org.assertj.core.api.Assertions.assertThat;12import static org.junit.jupiter.api.Assertions.assertThrows;13import static org.junit.platform.engine.TestTag.create;14import static org.junit.platform.launcher.tagexpression.TagExpressions.and;15import static org.junit.platform.launcher.tagexpression.TagExpressions.any;16import static org.junit.platform.launcher.tagexpression.TagExpressions.none;17import static org.junit.platform.launcher.tagexpression.TagExpressions.not;18import static org.junit.platform.launcher.tagexpression.TagExpressions.or;19import static org.junit.platform.launcher.tagexpression.TagExpressions.tag;20import java.util.Set;21import org.junit.jupiter.api.Test;22import org.junit.platform.commons.PreconditionViolationException;23import org.junit.platform.engine.TestTag;24class TagExpressionsTests {25	private static final TagExpression True = tags -> true;26	private static final TagExpression False = tags -> false;27	@Test28	void tagIsJustATestTag() {29		assertThat(tag("foo")).hasToString("foo");30	}31	@Test32	void rejectInvalidTestTags() {33		RuntimeException expected = assertThrows(PreconditionViolationException.class,34			() -> tag("tags with spaces are not allowed"));35		assertThat(expected).hasMessageContaining("tags with spaces are not allowed");36	}37	@Test38	void tagEvaluation() {39		var tagExpression = tag("foo");40		assertThat(tagExpression.evaluate(Set.of(create("foo")))).isTrue();41		assertThat(tagExpression.evaluate(Set.of(create("not_foo")))).isFalse();42	}43	@Test44	void justConcatenateNot() {45		assertThat(not(tag("foo"))).hasToString("!foo");46		assertThat(not(and(tag("foo"), tag("bar")))).hasToString("!(foo & bar)");47		assertThat(not(or(tag("foo"), tag("bar")))).hasToString("!(foo | bar)");48	}49	@Test50	void notEvaluation() {51		assertThat(not(True).evaluate(Set.of())).isFalse();52		assertThat(not(False).evaluate(Set.of())).isTrue();53	}54	@Test55	void encloseAndWithParenthesis() {56		assertThat(and(tag("foo"), tag("bar"))).hasToString("(foo & bar)");57	}58	@Test59	void andEvaluation() {60		assertThat(and(True, True).evaluate(Set.of())).isTrue();61		assertThat(and(True, False).evaluate(Set.of())).isFalse();62		assertThat(and(False, onEvaluateThrow()).evaluate(Set.of())).isFalse();63	}64	@Test65	void encloseOrWithParenthesis() {66		assertThat(or(tag("foo"), tag("bar"))).hasToString("(foo | bar)");67	}68	@Test69	void orEvaluation() {70		assertThat(or(False, False).evaluate(Set.of())).isFalse();71		assertThat(or(True, onEvaluateThrow()).evaluate(Set.of())).isTrue();72		assertThat(or(False, True).evaluate(Set.of())).isTrue();73	}74	@Test75	void anyEvaluation() {76		assertThat(any().evaluate(Set.of())).isFalse();77		assertThat(any().evaluate(Set.of(TestTag.create("foo")))).isTrue();78	}79	@Test80	void noneEvaluation() {81		assertThat(none().evaluate(Set.of())).isTrue();82		assertThat(none().evaluate(Set.of(TestTag.create("foo")))).isFalse();83	}84	private TagExpression onEvaluateThrow() {85		return tags -> {86			throw new RuntimeException("should not be evaluated");87		};88	}89}...

Source:AssertTests.java

...4import static org.hamcrest.CoreMatchers.equalTo;5import static org.hamcrest.CoreMatchers.not;6import static org.hamcrest.CoreMatchers.sameInstance;7import static org.hamcrest.CoreMatchers.startsWith;8import static org.junit.Assert.assertThat;9import static org.junit.matchers.JUnitMatchers.*;10import java.util.Arrays;11import org.hamcrest.core.CombinableMatcher;12import org.junit.Test;13/*14 * ç®çï¼Assertions æè¨æ¹æ³çä½¿ç¨15 * 16 */17public class AssertTests {18  @Test19  public void testAssertArrayEquals() {20    byte[] expected = "trial".getBytes();21    byte[] actual = "trial".getBytes();22    org.junit.Assert.assertArrayEquals("failure - byte arrays not same", expected, actual);23  }24  @Test25  public void testAssertEquals() {26    org.junit.Assert.assertEquals("failure - strings are not equal", "text", "text");27  }28  @Test29  public void testAssertFalse() {30    org.junit.Assert.assertFalse("failure - should be false", false);31  }32  @Test33  public void testAssertNotNull() {34    org.junit.Assert.assertNotNull("should not be null", new Object());35  }36  @Test37  public void testAssertNotSame() {38	//æ¯è¾ä¸¤ä¸ªå¯¹è±¡çååå°å39    org.junit.Assert.assertNotSame("should not be same Object", new Object(), new Object());40  }41  @Test42  public void testAssertNull() {43    org.junit.Assert.assertNull("should be null", null);44  }45  @Test46  public void testAssertSame() {47    Integer aNumber = Integer.valueOf(768);48    org.junit.Assert.assertSame("should be same", aNumber, aNumber);49  }50  // JUnit Matchers assertThat51  @Test52  public void testAssertThatBothContainsString() {53    org.junit.Assert.assertThat("albumen", both(containsString("a")).and(containsString("c")));54  }55  56  @Test57  public void testAssertThatEitherConteinString(){58	  org.junit.Assert.assertThat("albumen", either(containsString("al")).or(containsString("men")));59  }60  @Test61  public void testAssertThathasItemsContainsString() {62    org.junit.Assert.assertThat(Arrays.asList("one", "two", "three"), hasItems("one", "three"));63  }64  @Test65  public void testAssertThatEveryItemContainsString() {66    org.junit.Assert.assertThat(Arrays.asList(new String[] { "fun", "ban", "net" }), everyItem(containsString("n")));67  }68  // Core Hamcrest Matchers with assertThat69  @Test70  public void testAssertThatHamcrestCoreMatchers() {71    assertThat("good", allOf(equalTo("good"), startsWith("good")));72    assertThat("good", not(allOf(equalTo("bad"), equalTo("good"))));73    assertThat("good", anyOf(equalTo("bad"), equalTo("good")));74    assertThat(7, not(CombinableMatcher.<Integer> either(equalTo(3)).or(equalTo(4))));75    assertThat(new Object(), not(sameInstance(new Object())));76  }77  @Test78  public void testAssertTrue() {79    org.junit.Assert.assertTrue("failure - should be true", true);80  }81}...

assertThat

Using AI Code Generation

1import static org.junit.Assert.assertThat;2import java.util.Arrays;3import java.util.List;4import org.hamcrest.CoreMatchers;5import org.junit.Test;6public class HamcrestTest {7    public void test() {8        List<Integer> numbers = Arrays.asList(12, 15, 45);9        assertThat(numbers, CoreMatchers.hasItems(12, 45));10        assertThat(numbers, CoreMatchers.everyItem(CoreMatchers.greaterThan(10)));11        assertThat(numbers, CoreMatchers.everyItem(CoreMatchers.lessThan(100)));12    }13}

assertThat

Using AI Code Generation

1import static org.hamcrest.MatcherAssert.assertThat;2import static org.hamcrest.Matchers.*;3import org.junit.Test;4public class HamcrestMatchersTest {5	public void testAssertThatBothContainsString() {6		assertThat("albumen", both(containsString("a")).and(containsString("b")));7	}8	public void testAssertThatHasItems() {9		assertThat(Arrays.asList("one", "two", "three"), hasItems("one", "three"));10	}11	public void testAssertThatEveryItemContainsString() {12		assertThat(Arrays.asList(new String[] { "fun", "ban", "net" }), everyItem(containsString("n")));13	}14	public void testAssertThatHamcrestCoreMatchers() {15		assertThat("good", allOf(equalTo("good"), startsWith("good")));16		assertThat("good", not(allOf(equalTo("bad"), equalTo("good"))));17		assertThat("good", anyOf(equalTo("bad"), equalTo("good")));18		assertThat(7, not(CombinableMatcher.<Integer> either(equalTo(3)).or(equalTo(4))));19		assertThat(new Object(), not(sameInstance(new Object())));20	}21}

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.