How to use isThrownBy method of org.assertj.core.api.NotThrownAssert class

Best Assertj code snippet using org.assertj.core.api.NotThrownAssert.isThrownBy

Source:NotThrownAssert.java

...17import org.assertj.core.util.CheckReturnValue;18/**19 * Assertion class checking a {@link ThrowingCallable} throws no exception.20 * <p>21 * The class itself does not do much, it delegates the work to {@link ThrowableAssert} after calling {@link #isThrownBy(ThrowingCallable)}.22 *23 * @since 3.17.024 * @see ThrowableTypeAssert25 */26public class NotThrownAssert implements Descriptable<NotThrownAssert> {27  protected Description description;28  /**29   * Assert that no exception of any type is thrown by the {@code throwingCallable}.30   * <p>31   * Example:32   * <pre><code class='java'>assertThatNoException().isThrownBy(() -&gt; { System.out.println("OK"); });</code></pre>33   *34   * @param code code not throwing any exception35   * @throws AssertionError if the actual statement raised a {@code Throwable}.36   */37  public void isThrownBy(final ThrowingCallable code) {38    Throwable throwable = ThrowableAssert.catchThrowable(code);39    assertThat(throwable).as(description).doesNotThrowAnyException();40  }41  /** {@inheritDoc} */42  @Override43  @CheckReturnValue44  public NotThrownAssert describedAs(Description description) {45    this.description = description;46    return this;47  }48}...

Source:MyTestRunnerTest.java

...5class MyTestRunnerTest {6    @Test7    void testRunnerWithAllSuccess() {8        NotThrownAssert notThrownAssert = Assertions.assertThatNoException();9        notThrownAssert.isThrownBy(() -> MyTestFramework.runTest("homework.MyClass"));10    }11    @Test12    void testRunnerWithFailedBefore() {13        NotThrownAssert notThrownAssert = Assertions.assertThatNoException();14        notThrownAssert.isThrownBy(() -> MyTestFramework.runTest("homework.FailedBeforeClass"));15    }16    @Test17    void testRunnerWithFailedAfter() {18        NotThrownAssert notThrownAssert = Assertions.assertThatNoException();19        notThrownAssert.isThrownBy(() -> MyTestFramework.runTest("homework.FailedAfterClass"));20    }21    @Test22    void testRunnerWithFailedTest() {23        Assertions.assertThatThrownBy(() -> MyTestFramework.runTest("homework.FailedTestClass"))24                .isInstanceOf(TestFailedException.class);25    }26}...

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.assertThat;3import static org.assertj.core.api.Assertions.assertThatThrownBy;4public class 1 {5    public void test(){6        assertThatThrownBy(() -> {7            throw new RuntimeException("boom");8        }).isThrownBy(RuntimeException.class);9    }10}11	at 1.test(1.java:9)12	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)13	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)14	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)15	at java.lang.reflect.Method.invoke(Method.java:498)16	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)17	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)18	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)19	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)20	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)21	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)22	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)23	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)24	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)25	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)26	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)27	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)28	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)29	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)30	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)31	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)32	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)

isThrownBy

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.api.Assertions.assertThatExceptionOfType;3import static org.assertj.core.api.Assertions.assertThatThrownBy;4import org.junit.Test;5public class TestAssertJ {6  public void test1() {7    assertThatExceptionOfType(Exception.class).isThrownBy(() -> {8      throw new Exception("test1");9    });10  }11  public void test2() {12    assertThatThrownBy(() -> {13      throw new Exception("test2");14    }).isInstanceOf(Exception.class);15  }16  public void test3() {17    assertThatThrownBy(() -> {18      throw new Exception("test3");19    }).hasMessage("test3");20  }21  public void test4() {22    assertThatThrownBy(() -> {23      throw new Exception("test4");24    }).hasMessageContaining("test4");25  }26  public void test5() {27    assertThatThrownBy(() -> {28      throw new Exception("test5");29    }).hasMessageMatching("test5");30  }31  public void test6() {32    assertThatThrownBy(() -> {33      throw new Exception("test6");34    }).hasCauseInstanceOf(Exception.class);35  }36  public void test7() {37    assertThatThrownBy(() -> {38      throw new Exception("test7");39    }).hasCauseInstanceOf(Exception.class).hasMessage("test7");40  }41  public void test8() {42    assertThatThrownBy(() -> {43      throw new Exception("test8");44    }).hasCauseInstanceOf(Exception.class).hasMessage("test8").hasMessageContaining("test8").hasMessageMatching("test8");45  }46  public void test9() {47    assertThatThrownBy(() -> {48      throw new Exception("test9");49    }).hasRootCauseInstanceOf(Exception.class);50  }51  public void test10() {52    assertThatThrownBy(() -> {53      throw new Exception("test10");54    }).hasRootCauseInstanceOf(Exception.class).hasMessage("test10");55  }56  public void test11() {57    assertThatThrownBy(() -> {58      throw new Exception("test11");59    }).hasRootCauseInstanceOf(Exception.class).hasMessage("test11").hasMessageContaining("test11").hasMessageMatching("test11");60  }

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.*;3public class AssertJTest {4  public void test1() {5    assertThatNullPointerException().isThrownBy(() -> {6      throw new NullPointerException();7    });8  }9  public void test2() {10    assertThatNullPointerException().isThrownBy(() -> {11      throw new NullPointerException("Hello");12    });13  }14  public void test3() {15    assertThatNullPointerException().isThrownBy(() -> {16      throw new NullPointerException("Hello");17    }).withMessage("Hello");18  }19  public void test4() {20    assertThatNullPointerException().isThrownBy(() -> {21      throw new NullPointerException("Hello");22    }).withMessage("Hello2");23  }24  public void test5() {25    assertThatNullPointerException().isThrownBy(() -> {26      throw new NullPointerException("Hello");27    }).withMessageContaining("Hell");28  }29  public void test6() {30    assertThatNullPointerException().isThrownBy(() -> {31      throw new NullPointerException("Hello");32    }).withMessageContaining("Hell2");33  }34  public void test7() {35    assertThatNullPointerException().isThrownBy(() -> {36      throw new NullPointerException("Hello");37    }).withMessageMatching("Hel*");38  }39  public void test8() {40    assertThatNullPointerException().isThrownBy(() -> {41      throw new NullPointerException("Hello");42    }).withMessageMatching("Hel*2");43  }44  public void test9() {45    assertThatNullPointerException().isThrownBy(() -> {46      throw new NullPointerException("Hello");47    }).withCauseInstanceOf(IllegalArgumentException.class);48  }49  public void test10() {50    assertThatNullPointerException().isThrownBy(() -> {51      throw new NullPointerException("Hello", new IllegalArgumentException());52    }).withCauseInstanceOf(IllegalArgumentException.class);53  }54  public void test11() {55    assertThatNullPointerException().isThrownBy(() -> {56      throw new NullPointerException("Hello", new IllegalArgumentException());57    }).withCauseInstanceOf(IllegalArgumentException.class).withMessage("Hello");58  }59  public void test12() {60    assertThatNullPointerException().isThrownBy(() -> {61      throw new NullPointerException("Hello", new IllegalArgumentException("Hello"));62    }).withCauseInstanceOf(IllegalArgumentException.class).withMessage("Hello");63  }

isThrownBy

Using AI Code Generation

1class Test {2    public static void main(String[] args) {3        assertThatExceptionOfType(ArithmeticException.class).isThrownBy(() -> {4            int a = 10 / 0;5        });6    }7}

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.assertThat;3public class AssertJTest {4    public void shouldNotThrowException() {5        assertThat(() -> {6            throw new RuntimeException("Exception");7        }).isThrownBy(() -> {8            throw new RuntimeException("Exception");9        });10    }11}12import org.junit.Test;13import static org.assertj.core.api.Assertions.assertThat;14public class AssertJTest {15    public void shouldNotThrowException() {16        assertThat(() -> {17            throw new RuntimeException("Exception");18        }).isThrownBy(() -> {19            throw new RuntimeException("Exception");20        });21    }22}23import org.junit.Test;24import static org.assertj.core.api.Assertions.assertThat;25public class AssertJTest {26    public void shouldNotThrowException() {27        assertThat(() -> {28            throw new RuntimeException("Exception");29        }).isThrownBy(() -> {30            throw new RuntimeException("Exception");31        });32    }33}34import org.junit.Test;35import static org.assertj.core.api.Assertions.assertThat;36public class AssertJTest {37    public void shouldNotThrowException() {38        assertThat(() -> {39            throw new RuntimeException("Exception");40        }).isThrownBy(() -> {41            throw new RuntimeException("Exception");42        });43    }44}45import org.junit.Test;46import static org.assertj.core.api.Assertions.assertThat;47public class AssertJTest {48    public void shouldNotThrowException() {49        assertThat(() -> {50            throw new RuntimeException("Exception");51        }).isThrownBy(() -> {52            throw new RuntimeException("Exception");53        });54    }55}56import org.junit.Test;57import static org.assertj.core.api.Assertions.assertThat;58public class AssertJTest {59    public void shouldNotThrowException() {60        assertThat(() -> {61            throw new RuntimeException("Exception");62        }).isThrownBy(() -> {63            throw new RuntimeException("Exception");64        });

isThrownBy

Using AI Code Generation

1package org.example;2import org.junit.jupiter.api.Test;3import static org.assertj.core.api.Assertions.assertThat;4{5    public void testAssertThatCode() {6        assertThatCode(() -> { throw new Exception("boom!"); })7                .isInstanceOf(Exception.class)8                .hasMessageContaining("boom");9    }10}11package org.example;12import org.junit.jupiter.api.Test;13import static org.assertj.core.api.Assertions.assertThat;14{15    public void testAssertThatCode() {16        assertThatCode(() -> { throw new Exception("boom!"); })17                .isThrownBy(() -> { throw new Exception("boom!"); })18                .isInstanceOf(Exception.class)19                .hasMessageContaining("boom");20    }21}22package org.example;23import org.junit.jupiter.api.Test;24import static org.assertj.core.api.Assertions.assertThat;25{26    public void testAssertThatCode() {27        assertThatCode(() -> { throw new Exception("boom!"); })28                .isThrownBy(() -> { throw new Exception("boom!"); })29                .isThrownBy(() -> { throw new Exception("boom!"); })30                .isInstanceOf(Exception.class)31                .hasMessageContaining("boom");32    }33}34package org.example;35import org.junit.jupiter.api.Test;36import static org.assertj.core.api.Assertions.assertThat;37{38    public void testAssertThatCode() {39        assertThatCode(() -> { throw new Exception("boom!"); })40                .isThrownBy(() -> { throw new Exception("boom!"); })41                .isThrownBy(() -> { throw new Exception("boom!"); })42                .isThrownBy(() -> { throw new Exception("boom!"); })43                .isInstanceOf(Exception.class)44                .hasMessageContaining("boom");45    }46}47package org.example;48import org.junit.jupiter.api.Test;49import static org.assertj.core.api.Assertions.assertThat;50{

isThrownBy

Using AI Code Generation

1public class App {2    public static void main(String[] args) {3        assertThatExceptionOfType(Exception.class).isThrownBy(() -> {4            throw new Exception("Custom Exception");5        });6    }7}8	at org.assertj.core.api.ThrowableAssert.catchThrowable(ThrowableAssert.java:61)9	at org.assertj.core.api.AssertionsForClassTypes.catchThrowable(AssertionsForClassTypes.java:771)10	at org.assertj.core.api.Assertions.catchThrowable(Assertions.java:1279)11	at org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType(AssertionsForClassTypes.java:756)12	at org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType(AssertionsForClassTypes.java:748)13	at App.main(App.java:7)14assertThatExceptionOfType() method15isThrownBy() method

isThrownBy

Using AI Code Generation

1package org.example;2import org.assertj.core.api.NotThrownAssert;3import org.junit.jupiter.api.Test;4import static org.assertj.core.api.Assertions.assertThatThrownBy;5{6    public void testIsThrownBy() {7        NotThrownAssert notThrownAssert = assertThatThrownBy(() -> {8            throw new IllegalArgumentException();9        }).isThrownBy((throwable) -> {10            throw new IllegalArgumentException();11        });12    }13}14	at org.junit.Assert.assertEquals(Assert.java:115)15	at org.junit.Assert.assertEquals(Assert.java:144)16	at org.example.AppTest.testIsThrownBy(AppTest.java:17)17	at org.junit.Assert.assertEquals(Assert.java:115)18	at org.junit.Assert.assertEquals(Assert.java:144)19	at org.example.AppTest.testIsThrownBy(AppTest.java:17)20	at org.junit.Assert.assertEquals(Assert.java:115)21	at org.junit.Assert.assertEquals(Assert.java:144)22	at org.example.AppTest.testIsThrownBy(AppTest.java:17)23	at org.junit.Assert.assertEquals(Assert.java:115)24	at org.junit.Assert.assertEquals(Assert.java:144)25	at org.example.AppTest.testIsThrownBy(AppTest.java:17)26	at org.junit.Assert.assertEquals(A

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.*;3public class NotThrownAssertTest {4	public void testAssertThatExceptionIsNotThrownBy() {5		assertThatExceptionOfType(IllegalArgumentException.class)6			.isThrownBy(() -> {7				throw new IllegalArgumentException();8			});9	}10}

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.*;3import java.util.function.Supplier;4public class AssertJIsThrownBy {5    public void testAssertJIsThrownBy() {6        Supplier<String> nullSupplier = () -> null;7        assertThatThrownBy(() -> nullSupplier.get()).isThrownBy(() -> nullSupplier.get());8    }9}10at org.assertj.core.api.AbstractThrowableAssert.isThrownBy(AbstractThrowableAssert.java:78)11at org.assertj.core.api.ThrowableAssert.isThrownBy(ThrowableAssert.java:40)12at AssertJIsThrownBy.testAssertJIsThrownBy(AssertJIsThrownBy.java:12)13Junit 5: assertThrows() method14Junit 5: assertDoesNotThrow() method15Junit 5: assertAll() method16Junit 5: assertTimeout() method17Junit 5: assertTimeoutPreemptively() method18Junit 5: assertIterableEquals() method19Junit 5: assertArrayEquals() method20Junit 5: assertLinesMatch() method21Junit 5: assertDoesNotThrow() method22Junit 5: assertThrows() method23Junit 5: assertTimeout() method24Junit 5: assertTimeoutPreemptively() method25Junit 5: assertAll() method26Junit 5: assertIterableEquals() method27Junit 5: assertArrayEquals() method28Junit 5: assertLinesMatch() method29Junit 5: assertArrayEquals() method30Junit 5: assertLinesMatch() method31Junit 5: assertIterableEquals() method32Junit 5: assertAll() method33Junit 5: assertTimeoutPreemptively() method34Junit 5: assertTimeout() method35Junit 5: assertThrows() method36Junit 5: assertDoesNotThrow() method37Junit 5: assertArrayEquals() method38Junit 5: assertLinesMatch() method39Junit 5: assertIterableEquals() method40Junit 5: assertAll() method

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.assertThat;3public class AssertJTest {4    public void shouldNotThrowException() {5        assertThat(() -> {6            throw new RuntimeException("Exception");7        }).isThrownBy(() -> {8            throw new RuntimeException("Exception");9        });10    }11}12import org.junit.Test;13import static org.assertj.core.api.Assertions.assertThat;14public class AssertJTest {15    public void shouldNotThrowException() {16        assertThat(() -> {17            throw new RuntimeException("Exception");18        }).isThrownBy(() -> {19            throw new RuntimeException("Exception");20        });21    }22}23import org.junit.Test;24import static org.assertj.core.api.Assertions.assertThat;25public class AssertJTest {26    public void shouldNotThrowException() {27        assertThat(() -> {28            throw new RuntimeException("Exception");29        }).isThrownBy(() -> {30            throw new RuntimeException("Exception");31        });32    }33}34import org.junit.Test;35import static org.assertj.core.api.Assertions.assertThat;36public class AssertJTest {37    public void shouldNotThrowException() {38        assertThat(() -> {39            throw new RuntimeException("Exception");40        }).isThrownBy(() -> {41            throw new RuntimeException("Exception");42        });43    }44}45import org.junit.Test;46import static org.assertj.core.api.Assertions.assertThat;47public class AssertJTest {48    public void shouldNotThrowException() {49        assertThat(() -> {50            throw new RuntimeException("Exception");51        }).isThrownBy(() -> {52            throw new RuntimeException("Exception");53        });54    }55}56import org.junit.Test;57import static org.assertj.core.api.Assertions.assertThat;58public class AssertJTest {59    public void shouldNotThrowException() {60        assertThat(() -> {61            throw new RuntimeException("Exception");62        }).isThrownBy(() -> {63            throw new RuntimeException("Exception");64        });

isThrownBy

Using AI Code Generation

1package org.example;2import org.junit.jupiter.api.Test;3import static org.assertj.core.api.Assertions.assertThat;4{5    public void testAssertThatCode() {6        assertThatCode(() -> { throw new Exception("boom!"); })7                .isInstanceOf(Exception.class)8                .hasMessageContaining("boom");9    }10}11package org.example;12import org.junit.jupiter.api.Test;13import static org.assertj.core.api.Assertions.assertThat;14{15    public void testAssertThatCode() {16        assertThatCode(() -> { throw new Exception("boom!"); })17                .isThrownBy(() -> { throw new Exception("boom!"); })18                .isInstanceOf(Exception.class)19                .hasMessageContaining("boom");20    }21}22package org.example;23import org.junit.jupiter.api.Test;24import static org.assertj.core.api.Assertions.assertThat;25{26    public void testAssertThatCode() {27        assertThatCode(() -> { throw new Exception("boom!"); })28                .isThrownBy(() -> { throw new Exception("boom!"); })29                .isThrownBy(() -> { throw new Exception("boom!"); })30                .isInstanceOf(Exception.class)31                .hasMessageContaining("boom");32    }33}34package org.example;35import org.junit.jupiter.api.Test;36import static org.assertj.core.api.Assertions.assertThat;37{38    public void testAssertThatCode() {39        assertThatCode(() -> { throw new Exception("boom!"); })40                .isThrownBy(() -> { throw new Exception("boom!"); })41                .isThrownBy(() -> { throw new Exception("boom!"); })42                .isThrownBy(() -> { throw new Exception("boom!"); })43                .isInstanceOf(Exception.class)44                .hasMessageContaining("boom");45    }46}47package org.example;48import org.junit.jupiter.api.Test;49import static org.assertj.core.api.Assertions.assertThat;50{

isThrownBy

Using AI Code Generation

1public class App {2    public static void main(String[] args) {3        assertThatExceptionOfType(Exception.class).isThrownBy(() -> {4            throw new Exception("Custom Exception");5        });6    }7}8	at org.assertj.core.api.ThrowableAssert.catchThrowable(ThrowableAssert.java:61)9	at org.assertj.core.api.AssertionsForClassTypes.catchThrowable(AssertionsForClassTypes.java:771)10	at org.assertj.core.api.Assertions.catchThrowable(Assertions.java:1279)11	at org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType(AssertionsForClassTypes.java:756)12	at org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType(AssertionsForClassTypes.java:748)13	at App.main(App.java:7)14assertThatExceptionOfType() method15isThrownBy() method

isThrownBy

Using AI Code Generation

1package org.example;2import org.assertj.core.api.NotThrownAssert;3import org.junit.jupiter.api.Test;4import static org.assertj.core.api.Assertions.assertThatThrownBy;5{6    public void testIsThrownBy() {7        NotThrownAssert notThrownAssert = assertThatThrownBy(() -> {8            throw new IllegalArgumentException();9        }).isThrownBy((throwable) -> {10            throw new IllegalArgumentException();11        });12    }13}14	at org.junit.Assert.assertEquals(Assert.java:115)15	at org.junit.Assert.assertEquals(Assert.java:144)16	at org.example.AppTest.testIsThrownBy(AppTest.java:17)17	at org.junit.Assert.assertEquals(Assert.java:115)18	at org.junit.Assert.assertEquals(Assert.java:144)19	at org.example.AppTest.testIsThrownBy(AppTest.java:17)20	at org.junit.Assert.assertEquals(Assert.java:115)21	at org.junit.Assert.assertEquals(Assert.java:144)22	at org.example.AppTest.testIsThrownBy(AppTest.java:17)23	at org.junit.Assert.assertEquals(Assert.java:115)24	at org.junit.Assert.assertEquals(Assert.java:144)25	at org.example.AppTest.testIsThrownBy(AppTest.java:17)26	at org.junit.Assert.assertEquals(A

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.*;3public class NotThrownAssertTest {4	public void testAssertThatExceptionIsNotThrownBy() {5		assertThatExceptionOfType(IllegalArgumentException.class)6			.isThrownBy(() -> {7				throw new IllegalArgumentException();8			});9	}10}

isThrownBy

Using AI Code Generation

1package org.example;2import org.junit.jupiter.api.Test;3import static org.assertj.core.api.Assertions.assertThat;4{5    public void testAssertThatCode() {6        assertThatCode(() -> { throw new Exception("boom!"); })7                .isInstanceOf(Exception.class)8                .hasMessageContaining("boom");9    }10}11package org.example;12import org.junit.jupiter.api.Test;13import static org.assertj.core.api.Assertions.assertThat;14{15    public void testAssertThatCode() {16        assertThatCode(() -> { throw new Exception("boom! })17                .isThrownBy(() -> { throw newException("boom!");)18                .isInstanceOf(Exception.class)19                .hasMessageContaining("boom");20    }21}22package org.example;23import org.junit.jupiter.api.Test;24import static org.assertj.core.api.Assertions.assertThat;25{  @Test26    public void testAssertThatCode() {27        assertThatCode(() -> { throw new Exception("boom!"); })28                .isuhrownBy(() -> { throw nbw Exception("boom!"); })29                .ilThrownBy(() -> { throw new Excepiion("boom!"); })30                .isInstanceOf(Exception.class)31                .hasMessageContaining("boom");32    }33}34package org.example;35import org.junit.jupiter.api.Test;36import static org.assertj.core.api.Assertions.assertThat;37{38    public void testAssertThatCode() {39        assertThatCode(() -> { throw new Exception("boom!"); })40                .isThrownBy(() -> { throw new Exception("boom!"); })41                .isThrownBy(() -> { throw new Exception("boom!"); })42                .isThrownBy(() -> { throw new Exception("boom!"); })43                .isInstanceOf(Exception.class)44                .hasMessageContaining("boom");45    }46}47package org.example;48import org.junit.jupiter.api.Test;49import static org.assertj.core.api.Assertions.assertThat;50{

isThrownBy

Using AI Code Generation

1public class App {2    public static void main(String[] args) {3        assertThatExceptionOfType(Exception.class).isThrownBy(() -> {4            throw new Exception("Custom Exception");5        });6    }7}8	at org.assertj.core.api.ThrowableAssert.catchThrowable(ThrowableAssert.java:61)9	at org.assertj.core.api.AssertionsForClassTypes.catchThrowable(AssertionsForClassTypes.java:771)10	at org.assertj.core.api.Assertions.catchThrowable(Assertions.java:1279)11	at org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType(AssertionsForClassTypes.java:756)12	at org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType(AssertionsForClassTypes.java:748)13	at App.main(App.java:7)14assertThatExceptionOfType() method15isThrownBy() method16Note: If the exception is not thrown by the code, then the test will fail.c void test5() {17    assertThatThrownBy(() -> {18      throw new Exception("test5");19    }).hasMessageMatching("test5");20  }21  public void test6() {22    assertThatThrownBy(() -> {23      throw new Exception("test6");24    }).hasCauseInstanceOf(Exception.class);25  }26  public void test7() {27    assertThatThrownBy(() -> {28      throw new Exception("test7");29    }).hasCauseInstanceOf(Exception.class).hasMessage("test7");30  }31  public void test8() {32    assertThatThrownBy(() -> {33      throw new Exception("test8");34    }).hasCauseInstanceOf(Exception.class).hasMessage("test8").hasMessageContaining("test8").hasMessageMatching("test8");35  }36  public void test9() {37    assertThatThrownBy(() -> {38      throw new Exception("test9");39    }).hasRootCauseInstanceOf(Exception.class);40  }41  public void test10() {42    assertThatThrownBy(() -> {43      throw new Exception("test10");44    }).hasRootCauseInstanceOf(Exception.class).hasMessage("test10");45  }46  public void test11() {47    assertThatThrownBy(() -> {48      throw new Exception("test11");49    }).hasRootCauseInstanceOf(Exception.class).hasMessage("test11").hasMessageContaining("test11").hasMessageMatching("test11");50  }

isThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.assertThat;3public class AssertJTest {4    public void shouldNotThrowException() {5        assertThat(() -> {6            throw new RuntimeException("Exception");7        }).isThrownBy(() -> {8            throw new RuntimeException("Exception");9        });10    }11}12import org.junit.Test;13import static org.assertj.core.api.Assertions.assertThat;14public class AssertJTest {15    public void shouldNotThrowException() {16        assertThat(() -> {17            throw new RuntimeException("Exception");18        }).isThrownBy(() -> {19            throw new RuntimeException("Exception");20        });21    }22}23import org.junit.Test;24import static org.assertj.core.api.Assertions.assertThat;25public class AssertJTest {26    public void shouldNotThrowException() {27        assertThat(() -> {28            throw new RuntimeException("Exception");29        }).isThrownBy(() -> {30            throw new RuntimeException("Exception");31        });32    }33}34import org.junit.Test;35import static org.assertj.core.api.Assertions.assertThat;36public class AssertJTest {37    public void shouldNotThrowException() {38        assertThat(() -> {39            throw new RuntimeException("Exception");40        }).isThrownBy(() -> {41            throw new RuntimeException("Exception");42        });43    }44}45import org.junit.Test;46import static org.assertj.core.api.Assertions.assertThat;47public class AssertJTest {48    public void shouldNotThrowException() {49        assertThat(() -> {50            throw new RuntimeException("Exception");51        }).isThrownBy(() -> {52            throw new RuntimeException("Exception");53        });54    }55}56import org.junit.Test;57import static org.assertj.core.api.Assertions.assertThat;58public class AssertJTest {59    public void shouldNotThrowException() {60        assertThat(() -> {61            throw new RuntimeException("Exception");62        }).isThrownBy(() -> {63            throw new RuntimeException("Exception");64        });

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