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How to use none method of org.junit.rules.ExpectedException class

Best junit code snippet using org.junit.rules.ExpectedException.none

ExpectedException`org.junit.rules.ExpectedException`

The ExpectedException is a rule which helps scripts to verify that the script throws the specific exception or not

Code Snippets

Here are code snippets that can help you understand more how developers are using

Source:ExpectedExceptionCheckerTest.java

...35            "import org.junit.Rule;",36            "import org.hamcrest.CoreMatchers;",37            "import org.junit.rules.ExpectedException;",38            "class ExceptionTest {",39            "  @Rule ExpectedException thrown = ExpectedException.none();",40            "  @Test",41            "  public void test() throws Exception {",42            "    if (true) {",43            "      Path p = Paths.get(\"NOSUCH\");",44            "      thrown.expect(IOException.class);",45            "      thrown.expect(CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));",46            "      thrown.expectCause(",47            "          CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));",48            "      thrown.expectMessage(\"error\");",49            "      thrown.expectMessage(CoreMatchers.containsString(\"error\"));",50            "      Files.readAllBytes(p);",51            "      assertThat(Files.exists(p)).isFalse();",52            "    }",53            "  }",54            "}")55        .addOutputLines(56            "out/ExceptionTest.java",57            "import static com.google.common.truth.Truth.assertThat;",58            "import static org.hamcrest.MatcherAssert.assertThat;",59            "import static org.junit.Assert.assertThrows;",60            "",61            "import java.io.IOException;",62            "import java.nio.file.*;",63            "import org.hamcrest.CoreMatchers;",64            "import org.junit.Rule;",65            "import org.junit.Test;",66            "import org.junit.rules.ExpectedException;",67            "class ExceptionTest {",68            "  @Rule ExpectedException thrown = ExpectedException.none();",69            "  @Test",70            "  public void test() throws Exception {",71            "    if (true) {",72            "      Path p = Paths.get(\"NOSUCH\");",73            "      IOException thrown =",74            "          assertThrows(IOException.class, () -> Files.readAllBytes(p));",75            "      assertThat(thrown,",76            "          CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));",77            "      assertThat(thrown.getCause(),",78            "          CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));",79            "      assertThat(thrown).hasMessageThat().contains(\"error\");",80            "      assertThat(thrown.getMessage(), CoreMatchers.containsString(\"error\"));",81            "      assertThat(Files.exists(p)).isFalse();",82            "    }",83            "  }",84            "}")85        .doTest();86  }87  @Test88  public void noExceptionType() {89    testHelper90        .addInputLines(91            "in/ExceptionTest.java",92            "import static com.google.common.truth.Truth.assertThat;",93            "import java.io.IOException;",94            "import java.nio.file.*;",95            "import org.hamcrest.CoreMatchers;",96            "import org.junit.Rule;",97            "import org.junit.Test;",98            "import org.junit.rules.ExpectedException;",99            "class ExceptionTest {",100            "  @Rule ExpectedException thrown = ExpectedException.none();",101            "  @Test",102            "  public void test() throws Exception {",103            "    Path p = Paths.get(\"NOSUCH\");",104            "    thrown.expect(CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));",105            "    Files.readAllBytes(p);",106            "    Files.readAllBytes(p);",107            "  }",108            "}")109        .addOutputLines(110            "out/ExceptionTest.java",111            "import static com.google.common.truth.Truth.assertThat;",112            "import static org.hamcrest.MatcherAssert.assertThat;",113            "import static org.junit.Assert.assertThrows;",114            "",115            "import java.io.IOException;",116            "import java.nio.file.*;",117            "import org.hamcrest.CoreMatchers;",118            "import org.junit.Rule;",119            "import org.junit.Test;",120            "import org.junit.rules.ExpectedException;",121            "class ExceptionTest {",122            "  @Rule ExpectedException thrown = ExpectedException.none();",123            "  @Test",124            "  public void test() throws Exception {",125            "    Path p = Paths.get(\"NOSUCH\");",126            "    Throwable thrown = assertThrows(Throwable.class, () -> {",127            "      Files.readAllBytes(p);",128            "      Files.readAllBytes(p);",129            "    });",130            "    assertThat(thrown, CoreMatchers.is(CoreMatchers.instanceOf(IOException.class)));",131            "  }",132            "}")133        .doTest();134  }135  @Test136  public void noExpectations() {137    testHelper138        .addInputLines(139            "in/ExceptionTest.java",140            "import static com.google.common.truth.Truth.assertThat;",141            "import java.io.IOException;",142            "import java.nio.file.*;",143            "import org.hamcrest.CoreMatchers;",144            "import org.junit.Rule;",145            "import org.junit.Test;",146            "import org.junit.rules.ExpectedException;",147            "class ExceptionTest {",148            "  @Rule ExpectedException thrown = ExpectedException.none();",149            "  @Test",150            "  public void test() throws Exception {",151            "    Path p = Paths.get(\"NOSUCH\");",152            "    thrown.expect(IOException.class);",153            "    Files.readAllBytes(p);",154            "    assertThat(Files.exists(p)).isFalse();",155            "  }",156            "}")157        .addOutputLines(158            "out/ExceptionTest.java",159            "import static com.google.common.truth.Truth.assertThat;",160            "import static org.junit.Assert.assertThrows;",161            "import java.io.IOException;",162            "import java.nio.file.*;",163            "import org.hamcrest.CoreMatchers;",164            "import org.junit.Rule;",165            "import org.junit.Test;",166            "import org.junit.rules.ExpectedException;",167            "class ExceptionTest {",168            "  @Rule ExpectedException thrown = ExpectedException.none();",169            "  @Test",170            "  public void test() throws Exception {",171            "    Path p = Paths.get(\"NOSUCH\");",172            "    assertThrows(IOException.class, () -> Files.readAllBytes(p));",173            "    assertThat(Files.exists(p)).isFalse();",174            "  }",175            "}")176        .doTest();177  }178  @Test179  public void nonExpressionStatement() {180    testHelper181        .addInputLines(182            "in/ExceptionTest.java",183            "import static com.google.common.truth.Truth.assertThat;",184            "import java.io.IOException;",185            "import java.nio.file.*;",186            "import org.junit.Rule;",187            "import org.junit.Test;",188            "import org.junit.rules.ExpectedException;",189            "class ExceptionTest {",190            "  @Rule ExpectedException thrown = ExpectedException.none();",191            "  @Test",192            "  public void test() throws Exception {",193            "    Path p = Paths.get(\"NOSUCH\");",194            "    thrown.expect(IOException.class);",195            "    Files.readAllBytes(p);",196            "    if (true) Files.readAllBytes(p);",197            "  }",198            "}")199        .addOutputLines(200            "out/ExceptionTest.java",201            "import static com.google.common.truth.Truth.assertThat;",202            "import static org.junit.Assert.assertThrows;",203            "",204            "import java.io.IOException;",205            "import java.nio.file.*;",206            "import org.junit.Rule;",207            "import org.junit.Test;",208            "import org.junit.rules.ExpectedException;",209            "class ExceptionTest {",210            "  @Rule ExpectedException thrown = ExpectedException.none();",211            "  @Test",212            "  public void test() throws Exception {",213            "    Path p = Paths.get(\"NOSUCH\");",214            "    assertThrows(IOException.class, () -> {",215            "      Files.readAllBytes(p);",216            "      if (true) Files.readAllBytes(p);",217            "    });",218            "  }",219            "}")220        .doTest();221  }222  // https://github.com/hamcrest/JavaHamcrest/issues/27223  @Test224  public void isA_hasCauseThat() {225    testHelper226        .addInputLines(227            "in/ExceptionTest.java",228            "import static com.google.common.truth.Truth.assertThat;",229            "import java.io.IOException;",230            "import java.nio.file.*;",231            "import org.junit.Test;",232            "import org.junit.Rule;",233            "import org.hamcrest.CoreMatchers;",234            "import org.junit.rules.ExpectedException;",235            "class ExceptionTest {",236            "  @Rule ExpectedException thrown = ExpectedException.none();",237            "  @Test",238            "  public void test() throws Exception {",239            "    Path p = Paths.get(\"NOSUCH\");",240            "    thrown.expect(IOException.class);",241            "    thrown.expectCause(CoreMatchers.isA(IOException.class));",242            "    thrown.expectCause(org.hamcrest.core.Is.isA(IOException.class));",243            "    Files.readAllBytes(p);",244            "    assertThat(Files.exists(p)).isFalse();",245            "  }",246            "}")247        .addOutputLines(248            "out/ExceptionTest.java",249            "import static com.google.common.truth.Truth.assertThat;",250            "import static org.junit.Assert.assertThrows;",251            "",252            "import java.io.IOException;",253            "import java.nio.file.*;",254            "import org.hamcrest.CoreMatchers;",255            "import org.junit.Rule;",256            "import org.junit.Test;",257            "import org.junit.rules.ExpectedException;",258            "class ExceptionTest {",259            "  @Rule ExpectedException thrown = ExpectedException.none();",260            "  @Test",261            "  public void test() throws Exception {",262            "    Path p = Paths.get(\"NOSUCH\");",263            "    IOException thrown =",264            "        assertThrows(IOException.class, () -> Files.readAllBytes(p));",265            "    assertThat(thrown).hasCauseThat().isInstanceOf(IOException.class);",266            "    assertThat(thrown).hasCauseThat().isInstanceOf(IOException.class);",267            "    assertThat(Files.exists(p)).isFalse();",268            "  }",269            "}")270        .doTest();271  }272  @Test273  public void typedMatcher() {274    testHelper275        .addInputLines(276            "in/ExceptionTest.java",277            "import static com.google.common.truth.Truth.assertThat;",278            "import java.io.IOException;",279            "import java.nio.file.*;",280            "import org.junit.Test;",281            "import org.junit.Rule;",282            "import org.hamcrest.Matcher;",283            "import org.junit.rules.ExpectedException;",284            "class ExceptionTest {",285            "  @Rule ExpectedException thrown = ExpectedException.none();",286            "  Matcher<IOException> matcher;",287            "  @Test",288            "  public void test() throws Exception {",289            "    Path p = Paths.get(\"NOSUCH\");",290            "    thrown.expect(matcher);",291            "    Files.readAllBytes(p);",292            "    assertThat(Files.exists(p)).isFalse();",293            "  }",294            "}")295        .addOutputLines(296            "out/ExceptionTest.java",297            "import static com.google.common.truth.Truth.assertThat;",298            "import static org.hamcrest.MatcherAssert.assertThat;",299            "import static org.junit.Assert.assertThrows;",300            "",301            "import java.io.IOException;",302            "import java.nio.file.*;",303            "import org.hamcrest.Matcher;",304            "import org.junit.Rule;",305            "import org.junit.Test;",306            "import org.junit.rules.ExpectedException;",307            "class ExceptionTest {",308            "  @Rule ExpectedException thrown = ExpectedException.none();",309            "  Matcher<IOException> matcher;",310            "  @Test",311            "  public void test() throws Exception {",312            "    Path p = Paths.get(\"NOSUCH\");",313            "    IOException thrown =",314            "        assertThrows(IOException.class, () -> Files.readAllBytes(p));",315            "    assertThat(thrown, matcher);",316            "    assertThat(Files.exists(p)).isFalse();",317            "  }",318            "}")319        .doTest();320  }321  @Test322  public void nothingButAsserts() {323    testHelper324        .addInputLines(325            "in/ExceptionTest.java",326            "import static com.google.common.truth.Truth.assertThat;",327            "import org.junit.Rule;",328            "import org.junit.Test;",329            "import org.junit.rules.ExpectedException;",330            "class ExceptionTest {",331            "  @Rule ExpectedException thrown = ExpectedException.none();",332            "  @Test",333            "  public void test() throws Exception {",334            "    thrown.expect(RuntimeException.class);",335            "    assertThat(false).isFalse();",336            "    assertThat(true).isTrue();",337            "  }",338            "}")339        .addOutputLines(340            "out/ExceptionTest.java",341            "import static com.google.common.truth.Truth.assertThat;",342            "import org.junit.Rule;",343            "import org.junit.Test;",344            "import org.junit.rules.ExpectedException;",345            "class ExceptionTest {",346            "  @Rule ExpectedException thrown = ExpectedException.none();",347            "  @Test",348            "  public void test() throws Exception {",349            "    assertThat(false).isFalse();",350            "    assertThat(true).isTrue();",351            "  }",352            "}")353        .doTest();354  }355  @Test356  public void removeExplicitFail() {357    testHelper358        .addInputLines(359            "in/ExceptionTest.java",360            "import static com.google.common.truth.Truth.assertThat;",361            "import static org.junit.Assert.fail;",362            "import java.io.IOException;",363            "import java.nio.file.*;",364            "import org.junit.Test;",365            "import org.junit.Rule;",366            "import org.junit.rules.ExpectedException;",367            "class ExceptionTest {",368            "  @Rule ExpectedException thrown = ExpectedException.none();",369            "  @Test",370            "  public void testThrow() throws Exception {",371            "    thrown.expect(IOException.class);",372            "    throw new IOException();",373            "  }",374            "  @Test",375            "  public void one() throws Exception {",376            "    Path p = Paths.get(\"NOSUCH\");",377            "    thrown.expect(IOException.class);",378            "    Files.readAllBytes(p);",379            "    assertThat(Files.exists(p)).isFalse();",380            "    fail();",381            "  }",382            "  @Test",383            "  public void two() throws Exception {",384            "    Path p = Paths.get(\"NOSUCH\");",385            "    thrown.expect(IOException.class);",386            "    Files.readAllBytes(p);",387            "    assertThat(Files.exists(p)).isFalse();",388            "    throw new AssertionError();",389            "  }",390            "}")391        .addOutputLines(392            "out/ExceptionTest.java",393            "import static com.google.common.truth.Truth.assertThat;",394            "import static org.junit.Assert.assertThrows;",395            "import static org.junit.Assert.fail;",396            "",397            "import java.io.IOException;",398            "import java.nio.file.*;",399            "import org.junit.Rule;",400            "import org.junit.Test;",401            "import org.junit.rules.ExpectedException;",402            "class ExceptionTest {",403            "  @Rule ExpectedException thrown = ExpectedException.none();",404            "  @Test",405            "  public void testThrow() throws Exception {",406            "  }",407            "  @Test",408            "  public void one() throws Exception {",409            "    Path p = Paths.get(\"NOSUCH\");",410            "    assertThrows(IOException.class, () -> Files.readAllBytes(p));",411            "    assertThat(Files.exists(p)).isFalse();",412            "  }",413            "  @Test",414            "  public void two() throws Exception {",415            "    Path p = Paths.get(\"NOSUCH\");",416            "    assertThrows(IOException.class, () -> Files.readAllBytes(p));",417            "    assertThat(Files.exists(p)).isFalse();",418            "  }",419            "}")420        .doTest();421  }422  // https://github.com/google/error-prone/issues/1072423  @Test424  public void i1072() {425    testHelper426        .addInputLines(427            "in/ExceptionTest.java",428            "import org.junit.Rule;",429            "import org.junit.Test;",430            "import org.junit.rules.ExpectedException;",431            "class ExceptionTest {",432            "  @Rule ExpectedException thrown = ExpectedException.none();",433            "  @Test",434            "  public void testThrow(Class<? extends Throwable> clazz) throws Exception {",435            "    thrown.expect(clazz);",436            "    clazz.toString();",437            "  }",438            "}")439        .addOutputLines(440            "in/ExceptionTest.java",441            "import static org.junit.Assert.assertThrows;",442            "import org.junit.Rule;",443            "import org.junit.Test;",444            "import org.junit.rules.ExpectedException;",445            "class ExceptionTest {",446            "  @Rule ExpectedException thrown = ExpectedException.none();",447            "  @Test",448            "  public void testThrow(Class<? extends Throwable> clazz) throws Exception {",449            "    assertThrows(Throwable.class, () -> clazz.toString());",450            "  }",451            "}")452        .doTest();453  }454}...

Source:ExpectedExceptionTest.java

...8import static org.hamcrest.core.IsEqual.equalTo;9import static org.junit.Assert.assertThat;10import static org.junit.Assert.fail;11import static org.junit.Assume.assumeTrue;12import static org.junit.rules.ExpectedException.none;13import static org.junit.rules.EventCollector.everyTestRunSuccessful;14import static org.junit.rules.EventCollector.hasSingleAssumptionFailure;15import static org.junit.rules.EventCollector.hasSingleFailure;16import static org.junit.rules.EventCollector.hasSingleFailureWithMessage;17import java.util.Collection;18import org.hamcrest.CoreMatchers;19import org.hamcrest.Matcher;20import org.junit.Rule;21import org.junit.Test;22import org.junit.runner.JUnitCore;23import org.junit.runner.RunWith;24import org.junit.runners.Parameterized;25import org.junit.runners.Parameterized.Parameters;26@RunWith(Parameterized.class)27public class ExpectedExceptionTest {28    private static final String ARBITRARY_MESSAGE = "arbitrary message";29    @Parameters(name= "{0}")30    public static Collection<Object[]> testsWithEventMatcher() {31        return asList(new Object[][]{32                {EmptyTestExpectingNoException.class, everyTestRunSuccessful()},33                {ThrowExceptionWithExpectedType.class,34                        everyTestRunSuccessful()},35                {ThrowExceptionWithExpectedPartOfMessage.class,36                        everyTestRunSuccessful()},37                {38                        ThrowExceptionWithWrongType.class,39                        hasSingleFailureWithMessage(startsWith("\nExpected: an instance of java.lang.NullPointerException"))},40                {41                        HasWrongMessage.class,42                        hasSingleFailureWithMessage(startsWith("\nExpected: exception with message a string containing \"expectedMessage\"\n"43                                + "     but: message was \"actualMessage\""))},44                {45                        ThrowNoExceptionButExpectExceptionWithType.class,46                        hasSingleFailureWithMessage("Expected test to throw an instance of java.lang.NullPointerException")},47                {WronglyExpectsExceptionMessage.class, hasSingleFailure()},48                {ExpectsSubstring.class, everyTestRunSuccessful()},49                {50                        ExpectsSubstringNullMessage.class,51                        hasSingleFailureWithMessage(startsWith("\nExpected: exception with message a string containing \"anything!\""))},52                {ExpectsMessageMatcher.class, everyTestRunSuccessful()},53                {54                        ExpectedMessageMatcherFails.class,55                        hasSingleFailureWithMessage(startsWith("\nExpected: exception with message \"Wrong start\""))},56                {ExpectsMatcher.class, everyTestRunSuccessful()},57                {ExpectAssertionErrorWhichIsNotThrown.class, hasSingleFailure()},58                {FailedAssumptionAndExpectException.class,59                        hasSingleAssumptionFailure()},60                {FailBeforeExpectingException.class,61                        hasSingleFailureWithMessage(ARBITRARY_MESSAGE)},62                {63                        ExpectsMultipleMatchers.class,64                        hasSingleFailureWithMessage(startsWith("\nExpected: (an instance of java.lang.IllegalArgumentException and exception with message a string containing \"Ack!\")"))},65                {ThrowExceptionWithMatchingCause.class, everyTestRunSuccessful()},66                {ThrowExpectedNullCause.class, everyTestRunSuccessful()},67                {68                        ThrowUnexpectedCause.class,69                        hasSingleFailureWithMessage(CoreMatchers.<String>allOf(70                                startsWith("\nExpected: ("),71                                containsString("exception with cause is <java.lang.NullPointerException: expected cause>"),72                                containsString("cause was <java.lang.NullPointerException: an unexpected cause>"),73                                containsString("Stacktrace was: java.lang.IllegalArgumentException: Ack!"),74                                containsString("Caused by: java.lang.NullPointerException: an unexpected cause")))},75                {76                        UseNoCustomMessage.class,77                        hasSingleFailureWithMessage("Expected test to throw an instance of java.lang.IllegalArgumentException") },78                {79                        UseCustomMessageWithoutPlaceHolder.class,80                        hasSingleFailureWithMessage(ARBITRARY_MESSAGE) },81                {82                        UseCustomMessageWithPlaceHolder.class,83                        hasSingleFailureWithMessage(ARBITRARY_MESSAGE84                                + " - an instance of java.lang.IllegalArgumentException") }85        });86    }87    private final Class<?> classUnderTest;88    private final Matcher<EventCollector> matcher;89    public ExpectedExceptionTest(Class<?> classUnderTest,90            Matcher<EventCollector> matcher) {91        this.classUnderTest = classUnderTest;92        this.matcher = matcher;93    }94    @Test95    public void runTestAndVerifyResult() {96        EventCollector collector = new EventCollector();97        JUnitCore core = new JUnitCore();98        core.addListener(collector);99        core.run(classUnderTest);100        assertThat(collector, matcher);101    }102    public static class EmptyTestExpectingNoException {103        @Rule104        public ExpectedException thrown = none();105        @Test106        public void throwsNothing() {107        }108    }109    public static class ThrowExceptionWithExpectedType {110        @Rule111        public ExpectedException thrown = none();112        @Test113        public void throwsNullPointerException() {114            thrown.expect(NullPointerException.class);115            throw new NullPointerException();116        }117    }118    public static class ThrowExceptionWithExpectedPartOfMessage {119        @Rule120        public ExpectedException thrown = none();121        @Test122        public void throwsNullPointerExceptionWithMessage() {123            thrown.expect(NullPointerException.class);124            thrown.expectMessage(ARBITRARY_MESSAGE);125            throw new NullPointerException(ARBITRARY_MESSAGE + "something else");126        }127    }128    public static class ThrowExceptionWithWrongType {129        @Rule130        public ExpectedException thrown = none();131        @Test132        public void throwsNullPointerException() {133            thrown.expect(NullPointerException.class);134            throw new IllegalArgumentException();135        }136    }137    public static class HasWrongMessage {138        @Rule139        public ExpectedException thrown = none();140        @Test141        public void throwsNullPointerException() {142            thrown.expectMessage("expectedMessage");143            throw new IllegalArgumentException("actualMessage");144        }145    }146    public static class ThrowNoExceptionButExpectExceptionWithType {147        @Rule148        public ExpectedException thrown = none();149        @Test150        public void doesntThrowNullPointerException() {151            thrown.expect(NullPointerException.class);152        }153    }154    public static class WronglyExpectsExceptionMessage {155        @Rule156        public ExpectedException thrown = none();157        @Test158        public void doesntThrowAnything() {159            thrown.expectMessage("anything!");160        }161    }162    public static class ExpectsSubstring {163        @Rule164        public ExpectedException thrown = none();165        @Test166        public void throwsMore() {167            thrown.expectMessage("anything!");168            throw new NullPointerException(169                    "This could throw anything! (as long as it has the right substring)");170        }171    }172    public static class ExpectsSubstringNullMessage {173        @Rule174        public ExpectedException thrown = none();175        @Test176        public void throwsMore() {177            thrown.expectMessage("anything!");178            throw new NullPointerException();179        }180    }181    public static class ExpectsMessageMatcher {182        @Rule183        public ExpectedException thrown = none();184        @Test185        public void throwsMore() {186            thrown.expectMessage(startsWith(ARBITRARY_MESSAGE));187            throw new NullPointerException(ARBITRARY_MESSAGE + "!");188        }189    }190    public static class ExpectedMessageMatcherFails {191        @Rule192        public ExpectedException thrown = none();193        @Test194        public void throwsMore() {195            thrown.expectMessage(equalTo("Wrong start"));196            throw new NullPointerException("Back!");197        }198    }199    public static class ExpectsMatcher {200        @Rule201        public ExpectedException thrown = none();202        @Test203        public void throwsMore() {204            thrown.expect(any(Exception.class));205            throw new NullPointerException("Ack!");206        }207    }208    public static class ExpectsMultipleMatchers {209        @Rule210        public ExpectedException thrown = none();211        @Test212        public void throwsMore() {213            thrown.expect(IllegalArgumentException.class);214            thrown.expectMessage("Ack!");215            throw new NullPointerException("Ack!");216        }217    }218    //https://github.com/junit-team/junit4/pull/583219    public static class ExpectAssertionErrorWhichIsNotThrown {220        @Rule221        public ExpectedException thrown = none();222        @Test223        public void fails() {224            thrown.expect(AssertionError.class);225        }226    }227    public static class FailBeforeExpectingException {228        @Rule229        public ExpectedException thrown = none();230        @Test231        public void fails() {232            fail(ARBITRARY_MESSAGE);233            thrown.expect(IllegalArgumentException.class);234        }235    }236    public static class FailedAssumptionAndExpectException {237        @Rule238        public ExpectedException thrown = none();239        @Test240        public void failedAssumption() {241            assumeTrue(false);242            thrown.expect(NullPointerException.class);243        }244    }245    public static class ThrowExceptionWithMatchingCause {246        @Rule247        public ExpectedException thrown = none();248        @Test249        public void throwExceptionWithMatchingCause() {250            NullPointerException expectedCause = new NullPointerException("expected cause");251            thrown.expect(IllegalArgumentException.class);252            thrown.expectMessage("Ack!");253            thrown.expectCause(is(expectedCause));254            throw new IllegalArgumentException("Ack!", expectedCause);255        }256    }257    public static class ThrowExpectedNullCause {258        @Rule259        public ExpectedException thrown = none();260        @Test261        public void throwExpectedNullCause() {262            thrown.expect(IllegalArgumentException.class);263            thrown.expectMessage("Ack!");264            thrown.expectCause(nullValue(Throwable.class));265            throw new IllegalArgumentException("Ack!");266        }267    }268    public static class ThrowUnexpectedCause {269        @Rule270        public ExpectedException thrown = ExpectedException.none();271        @Test272        public void throwWithCause() {273            thrown.expect(IllegalArgumentException.class);274            thrown.expectMessage("Ack!");275            thrown.expectCause(is(new NullPointerException("expected cause")));276            throw new IllegalArgumentException("Ack!", new NullPointerException("an unexpected cause"));277        }278    }279    280    public static class UseNoCustomMessage {281        @Rule282        public ExpectedException thrown= ExpectedException.none();283        @Test284        public void noThrow() {285            thrown.expect(IllegalArgumentException.class);286        }287    }288    public static class UseCustomMessageWithPlaceHolder {289        @Rule290        public ExpectedException thrown = ExpectedException.none();291        @Test292        public void noThrow() {293            thrown.expect(IllegalArgumentException.class);294            thrown.reportMissingExceptionWithMessage(ARBITRARY_MESSAGE295                    + " - %s");296        }297    }298    public static class UseCustomMessageWithoutPlaceHolder {299        @Rule300        public ExpectedException thrown= ExpectedException.none();301        @Test302        public void noThrow() {303            thrown.expect(IllegalArgumentException.class);304            thrown.reportMissingExceptionWithMessage(ARBITRARY_MESSAGE);305        }306    }307}...

Source:ExpectedException.java

...30 *31 * @author Christian Ihle32 */33public class ExpectedException implements TestRule {34    private final org.junit.rules.ExpectedException expectedException = org.junit.rules.ExpectedException.none();35    public static ExpectedException none() {36        return new ExpectedException();37    }38    @Override39    public Statement apply(final Statement base, final Description description) {40        return expectedException.apply(base, description);41    }42    /**43     * Which exception to expect.44     */45    public void expect(final Class<? extends Throwable> expectedExceptionClass) {46        expectedException.expect(expectedExceptionClass);47    }48    /**49     * The exact exception message to expect....

Source:AbstractFtpTestHarness.java

...4 * license, a copy of which has been included with this distribution in the5 * LICENSE.txt file.6 */7package org.mule.extension;8import static org.junit.rules.ExpectedException.none;9import org.mule.tck.junit4.rule.SystemProperty;10import org.junit.rules.ExpectedException;11import org.junit.rules.ExternalResource;12import org.junit.rules.TestRule;13import org.junit.runner.Description;14import org.junit.runners.model.Statement;15/**16 * Base class for {@link FtpTestHarness} implementations17 *18 * @since 4.019 */20public abstract class AbstractFtpTestHarness extends ExternalResource implements FtpTestHarness {21  private SystemProperty profileSystemProperty;22  private ExpectedException expectedException = none();23  /**24   * Creates a new instance25   *26   * @param profile the name of a spring profile to activate27   */28  public AbstractFtpTestHarness(String profile) {29    profileSystemProperty = new SystemProperty("spring.profiles.active", profile);30  }31  @Override32  public final Statement apply(Statement base, Description description) {33    base = applyAll(base, description, profileSystemProperty, expectedException);34    base = applyAll(base, description, getChildRules());35    return super.apply(base, description);36  }37  /**38   * @return {@link TestRule testRules} declared on the implementations which should also be applied39   */40  protected abstract TestRule[] getChildRules();41  @Override42  protected final void before() throws Throwable {43    doBefore();44  }45  /**46   * Template method for performing setup actions47   */48  protected void doBefore() throws Throwable {49  }50  /**51   * Delegates into {@link #doAfter()} and resets the {@link #expectedException}52   */53  @Override54  protected final void after() {55    try {56      doAfter();57    } catch (Exception e) {58      throw new RuntimeException(e);59    } finally {60      expectedException = ExpectedException.none();61    }62  }63  /**64   * Template method for performing cleanup actions65   */66  protected void doAfter() throws Exception {67  }68  /**69   * {@inheritDoc}70   */71  @Override72  public ExpectedException expectedException() {73    return expectedException;74  }...

Source:RulesTest.java

...16public class RulesTest {17    @Rule18    public TemporaryFolder folder = new TemporaryFolder();19    @Rule20    public ExpectedException exception = ExpectedException.none();21    @Rule22    public ErrorCollector errors = new ErrorCollector();23    @Rule24    public TestName testName = new TestName();25    @Rule26    public TestWatcher testWatcher = new TestWatcher() {27    };28    @Rule29    public Timeout timeout = new Timeout(0);30    @Test31    @Parameters("")32    public void shouldHandleRulesProperly(String n) {33        assertThat(testName.getMethodName()).isEqualTo("shouldHandleRulesProperly");34    }...

Source:JUnit4BuiltInTestRulesTest.java

23import static org.hamcrest.Matchers.is;4import static org.hamcrest.Matchers.isA;5import static org.junit.Assert.assertThat;6import static org.junit.rules.ExpectedException.none;78import java.io.File;9import java.io.IOException;1011import org.junit.Rule;12import org.junit.Test;13import org.junit.rules.ExpectedException;14import org.junit.rules.TemporaryFolder;1516public class JUnit4BuiltInTestRulesTest {17    /*18     * you can use this template to create expected exceptions rules fast:19     * ${staticImp:importStatic(org.junit.rules.ExpectedException.none)}20     * ${imp:import(org.junit.Rule,org.junit.rules.ExpectedException)}@Rule21     * public ExpectedException exception = none();22     */2324    @Rule25    public ExpectedException exception = none();2627    @Rule28    public TemporaryFolder folder = new TemporaryFolder(); // can be called with29							   // parent folder3031    @Test32    public void comparingToExpectedInTestAnnotationWeCanValidateCauseAndMessageToo() throws Exception {33	exception.expect(RuntimeException.class);34	exception.expectCause(isA(IOException.class));35	exception.expectMessage("substring");3637	throw new IllegalArgumentException("Message containing substring", new IOException("the cause"));38    }39
...

Source:Rules.java

...15public class Rules {16    @Rule17    public TemporaryFolder folder = new TemporaryFolder();18    @Rule19    public ExpectedException exception = ExpectedException.none();20    @Rule21    public ErrorCollector errors = new ErrorCollector();22    @Rule23    public TestName testName = new TestName();24    @Rule25    public TestWatcher testWatcher = new TestWatcher() {};26    @Rule27    public Timeout timeout = new Timeout(28            0);29    @Test30    @Parameters("test")31    public void shouldHandleRulesWork(String n) {32        assertThat(testName.getMethodName()).isEqualTo("shouldHandleRulesWork");33    }...

none

Using AI Code Generation

1    public ExpectedException thrown = ExpectedException.none();2    public void throwsNothing() {3    }4    public void shouldTestExceptionMessage() throws IndexOutOfBoundsException {5        List<Object> list = new ArrayList<Object>();6        thrown.expect(IndexOutOfBoundsException.class);7        thrown.expectMessage("Index: 0, Size: 0");8    }9    public void shouldTestExceptionMessageWithMatcher() throws IndexOutOfBoundsException {10        List<Object> list = new ArrayList<Object>();11        thrown.expect(IndexOutOfBoundsException.class);12        thrown.expectMessage(startsWith("Index:"));13    }14    public void shouldTestRootCause() throws IOException {15        InputStream streamMock = mock(InputStream.class);16        IOException expectedEx = new IOException("BAM!");17        when(streamMock.read()).thenThrow(expectedEx);18        try {19            streamMock.read();20            fail("Expected an IOException to be thrown");21        } catch (IOException actualEx) {22            assertSame(expectedEx, actualEx.getCause());23        }24    }25    public void shouldTestExceptionType() {26        thrown.expect(IllegalArgumentException.class);27        throw new IllegalArgumentException("message");28    }29    public void shouldTestExceptionTypeWithMatchers() {30        thrown.expect(IllegalArgumentException.class);31        thrown.expectMessage(containsString("Illegal"));32        throw new IllegalArgumentException("Illegal argument");33    }34    public void shouldTestNoExceptionThrown() {35        thrown.expect(IllegalArgumentException.class);36    }37    public void shouldTestNoExceptionThrown2() {38        thrown.expect(IllegalArgumentException.class);39        thrown.expectMessage(containsString("Illegal"));40    }41    public void shouldTestMultipleExceptionTypes() {42        thrown.expect(any(IllegalArgumentException.class));43        throw new IllegalArgumentException("message");44    }45    public void shouldTestMultipleExceptionTypesWithMatchers() {46        thrown.expect(any(IllegalArgumentException.class));47        thrown.expectMessage(containsString("Illegal"));48        throw new IllegalArgumentException("Illegal argument");49    }50    public void shouldTestMultipleExceptionTypesWithMatchers2() {51        thrown.expect(any(IllegalArgumentException.class));52        thrown.expectMessage(

none

Using AI Code Generation

1public class ExpectedExceptionTest {2    public ExpectedException thrown = ExpectedException.none();3    public void throwsNothing() {4    }5    public void shouldTestExceptionMessage() {6        thrown.expect(IllegalArgumentException.class);7        thrown.expectMessage("a message");8        throw new IllegalArgumentException("a message");9    }10    public void shouldTestExceptionMessageMatcher() {11        thrown.expect(IllegalArgumentException.class);12        thrown.expectMessage(CoreMatchers.startsWith("a"));13        throw new IllegalArgumentException("a message");14    }15}16public class ExpectedExceptionTest {17    public ExpectedException thrown = ExpectedException.none();18    public void throwsNothing() {19    }20    public void shouldTestExceptionMessage() {21        thrown.expect(IllegalArgumentException.class);22        thrown.expectMessage("a message");23        throw new IllegalArgumentException("a message");24    }25    public void shouldTestExceptionMessageMatcher() {26        thrown.expect(IllegalArgumentException.class);27        thrown.expectMessage(CoreMatchers.startsWith("a"));28        throw new IllegalArgumentException("a message");29    }30}31public class ExpectedExceptionTest {32    public ExpectedException thrown = ExpectedException.none();33    public void throwsNothing() {34    }35    public void shouldTestExceptionMessage() {36        thrown.expect(IllegalArgumentException.class);37        thrown.expectMessage("a message");38        throw new IllegalArgumentException("a message");39    }40    public void shouldTestExceptionMessageMatcher() {41        thrown.expect(IllegalArgumentException.class);42        thrown.expectMessage(CoreMatchers.startsWith("a"));43        throw new IllegalArgumentException("a message");44    }45}46public class ExpectedExceptionTest {47    public ExpectedException thrown = ExpectedException.none();48    public void throwsNothing() {49    }50    public void shouldTestExceptionMessage() {51        thrown.expect(IllegalArgumentException.class);

none

Using AI Code Generation

1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ExpectedException;4import java.io.IOException;5public class ExpectedExceptionExample {6    public ExpectedException thrown = ExpectedException.none();7    public void throwsNothing() {8    }9    public void throwsExceptionWithSpecificType() {10        thrown.expect(IOException.class);11        throw new IOException();12    }13    public void throwsExceptionWithMessage() {14        thrown.expect(IOException.class);15        thrown.expectMessage("boom!");16        throw new IOException("boom!");17    }18}19import org.junit.Rule;20import org.junit.Test;21import org.junit.rules.ExpectedException;22import java.io.IOException;23public class ExpectedExceptionExample {24    public ExpectedException thrown = ExpectedException.none();25    public void throwsNothing() {26    }27    public void throwsExceptionWithSpecificType() {28        thrown.expect(IOException.class);29        throw new IOException();30    }31    public void throwsExceptionWithMessage() {32        thrown.expect(IOException.class);33        thrown.expectMessage("boom!");34        throw new IOException("boom!");35    }36}37import org.junit.Rule;38import org.junit.Test;39import org.junit.rules.ExpectedException;40import java.io.IOException;41public class ExpectedExceptionExample {42    public ExpectedException thrown = ExpectedException.none();43    public void throwsNothing() {44    }45    public void throwsExceptionWithSpecificType() {46        thrown.expect(IOException.class);47        throw new IOException();48    }49    public void throwsExceptionWithMessage() {50        thrown.expect(IOException.class);51        thrown.expectMessage("boom!");52        throw new IOException("boom!");53    }54}55import org.junit.Rule;56import org.junit.Test;57import org.junit.rules.ExpectedException;58import java.io.IOException;59public class ExpectedExceptionExample {60    public ExpectedException thrown = ExpectedException.none();61    public void throwsNothing() {62    }63    public void throwsExceptionWithSpecificType() {64        thrown.expect(IOException.class);65        throw new IOException();66    }67    public void throwsExceptionWithMessage() {68        thrown.expect(IOException.class);69        thrown.expectMessage("boom!");70        throw new IOException("boom!");71    }72}73import org

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Using AI Code Generation

1public void testExceptionMessage() {2    exception.expect(IllegalArgumentException.class);3    exception.expectMessage("a message");4    exception.expectMessage(containsString("a mess"));5    exception.expectMessage(startsWith("a"));6    exception.expectMessage(endsWith("message"));7    exception.expectMessage(matchesPattern("a.*ge"));8    exception.expectMessage(not(containsString("a mess")));9    exception.expectMessage(not(startsWith("a")));10    exception.expectMessage(not(endsWith("message")));11    exception.expectMessage(not(matchesPattern("a.*ge")));12    exception.expectMessage(not(equalTo("a message")));13    exception.expectMessage(not(equalTo(null)));14    exception.expectMessage(not(nullValue()));15    exception.expectMessage(not(nullValue(String.class)));16    exception.expectMessage(not(instanceOf(String.class)));17    exception.expectMessage(not(any(String.class)));18    exception.expectMessage(not(anything()));19    exception.expectMessage(not(is("a message")));20    exception.expectMessage(not(is(null)));21    exception.expectMessage(not(isA(String.class)));22    exception.expectMessage(not(hasToString("a message")));23    exception.expectMessage(not(hasToString(containsString("a mess"))));24    exception.expectMessage(not(hasToString(startsWith("a"))));25    exception.expectMessage(not(hasToString(endsWith("message"))));26    exception.expectMessage(not(hasToString(matchesPattern("a.*ge"))));27    exception.expectMessage(not(hasToString(nullValue())));28    exception.expectMessage(not(hasToString(nullValue(String.class))));29    exception.expectMessage(not(hasToString(instanceOf(String.class))));30    exception.expectMessage(not(hasToString(any(String.class))));31    exception.expectMessage(not(hasToString(anything())));32    exception.expectMessage(not(hasToString(is("a message"))));33    exception.expectMessage(not(hasToString(is(null))));34    exception.expectMessage(not(hasToString(isA(String.class))));35    exception.expectMessage(not(hasToString(equalTo("a message"))));36    exception.expectMessage(not(hasToString(equalTo(null))));37    exception.expectMessage(not(hasItem("a message")));38    exception.expectMessage(not(hasItem(null)));39    exception.expectMessage(not(hasItems("a message")));40    exception.expectMessage(not(hasItems(null)));41    exception.expectMessage(not(hasItemInArray("a message")));42    exception.expectMessage(not(hasItemInArray(null)));43    exception.expectMessage(not(hasItemsInArray("a message")));44    exception.expectMessage(not(hasItemsInArray(null)));45    exception.expectMessage(not(hasProperty("a message")));

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Using AI Code Generation

1*none()* returns a new *ExpectedException* instance that does not expect any exception. This can be used to disable an existing *ExpectedException* rule. For example:2public ExpectedException thrown = ExpectedException.none();3public void throwsNothing() {4}5public void throwsNullPointerException() {6    thrown.expect(NullPointerException.class);7    throw new NullPointerException();8}9public void throwsNothing() {10    thrown = ExpectedException.none();11}12public void throwsNullPointerException() {13    thrown = ExpectedException.none();14    thrown.expect(NullPointerException.class);15    throw new NullPointerException();16}17*expect(Class<? extends Throwable> type)* expects an exception of the specified type. For example:18public ExpectedException thrown = ExpectedException.none();19public void throwsNullPointerException() {20    thrown.expect(NullPointerException.class);21    throw new NullPointerException();22}23*expectMessage(String message)* expects an exception with the specified message. For example:24public ExpectedException thrown = ExpectedException.none();25public void throwsNullPointerExceptionWithMessage() {26    thrown.expect(NullPointerException.class);27    thrown.expectMessage("happened");28    throw new NullPointerException("happened");29}30*expectMessage(Matcher<? super String> matcher)* expects an exception with a message that satisfies the specified matcher. For example:31public ExpectedException thrown = ExpectedException.none();32public void throwsNullPointerExceptionWithMessage() {33    thrown.expect(NullPointerException.class);34    thrown.expectMessage(containsString("happened"));35    throw new NullPointerException("what happened?");36}37*expectCause(Matcher<? super Throwable> matcher)* expects an exception with a cause that satisfies the specified matcher. For example:38public ExpectedException thrown = ExpectedException.none();

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.