KaneAI - World’s First E2E Software Testing Agent.Signup for Private Beta Join TestMu Conference

How to use WithThrowable class of org.assertj.core.api package

Best Assertj code snippet using org.assertj.core.api.WithThrowable

Source:WithThrowable.java

...10 *11 * Copyright 2012-2020 the original author or authors.12 */13package org.assertj.core.api;14public class WithThrowable {15  private final Throwable throwable;16  WithThrowable(Throwable exception) {17    this.throwable = exception;18  }19  /**20   * Checks that the underlying throwable is of the given type and returns a {@link ThrowableAssertAlternative} to chain21   * further assertions on the underlying throwable.22   * @param type the expected {@link Throwable} type23   * @return a {@link ThrowableAssertAlternative} built with underlying throwable.24   */25  public ThrowableAssertAlternative<?> withThrowableOfType(Class<? extends Throwable> type) {26    return new ThrowableAssertAlternative<>(throwable).isInstanceOf(type);27  }28}...

WithThrowable

Using AI Code Generation

1import org.assertj.core.api.WithThrowable;2import org.assertj.core.api.Assertions;3public class AssertJExceptionTest {4    public void testException() {5        Assertions.assertThatThrownBy(() -> {6            throw new Exception("This is an exception");7        }).isInstanceOf(Exception.class)8                .hasMessage("This is an exception");9    }10}

WithThrowable

Using AI Code Generation

1assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {2}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);3assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {4}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);5assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {6}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);7assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {8}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);9assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {10}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);11assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {12}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);13assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {14}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);15assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {16}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);17assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {18}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);19assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {20}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);21assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {22}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);23assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {24}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);25assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {26}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);27assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> {28}).withMessage("message").withCauseInstanceOf(IllegalArgumentException.class);

WithThrowable

Using AI Code Generation

1import org.assertj.core.api.WithThrowable;2import org.junit.jupiter.api.Test;3import static org.assertj.core.api.Assertions.assertThat;4import static org.assertj.core.api.Assertions.catchThrowable;5public class WithThrowableTest {6    public void testWithThrowable() {7        Throwable thrown = catchThrowable(() -> {8            throw new IllegalArgumentException("boom!");9        });10        assertThat(thrown).isInstanceOf(IllegalArgumentException.class)11                .hasMessageContaining("boom");12    }13}14at org.assertj.core.api.WithThrowableTest.testWithThrowable(WithThrowableTest.java:18)

WithThrowable

Using AI Code Generation

1    void shouldThrowException() {2        assertThatThrownBy(() -> {3            throw new Exception("exception message");4        }).isInstanceOf(Exception.class)5                .hasMessage("exception message");6    }7}

WithThrowable

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThatThrownBy;2import static org.assertj.core.api.Assertions.assertThat;3import static org.assertj.core.api.Assertions.withThrowable;4import static org.assertj.core.api.Assertions.catchThrowable;5import static org.assertj.core.api.Assertions.catchThrowableOfType;6import static org.assertj.core.api.Assertions.catchThrowableByType;7import java.io.IOException;8import java.nio.file.Path;9import java.nio.file.Paths;10import java.util.ArrayList;11import java.util.List;12import java.util.NoSuchElementException;13import java.util.Optional;14import org.junit.Test;15public class ExceptionTest {16    public void whenExceptionThrown_thenAssertionSucceeds() {17        List<String> list = new ArrayList<>();18        assertThatThrownBy(() -> {19            list.get(0);20        }).isInstanceOf(IndexOutOfBoundsException.class);21    }22    public void whenExceptionThrown_thenAssertionSucceeds2() {23        List<String> list = new ArrayList<>();24        assertThatThrownBy(new WithThrowable() {25            public void execute() throws Throwable {26                list.get(0);27            }28        }).isInstanceOf(IndexOutOfBoundsException.class);29    }30    public void whenExceptionThrown_thenAssertionSucceeds3() {31        List<String> list = new ArrayList<>();32        Throwable thrown = catchThrowable(() -> {33            list.get(0);34        });35        assertThat(thrown).isInstanceOf(IndexOutOfBoundsException.class);36    }37    public void whenExceptionThrown_thenAssertionSucceeds4() {38        List<String> list = new ArrayList<>();39        IndexOutOfBoundsException thrown = catchThrowableOfType(() -> {40            list.get(0);41        }, IndexOutOfBoundsException.class);42        assertThat(thrown).isInstanceOf(IndexOutOfBoundsException.class);43    }44    public void whenExceptionThrown_thenAssertionSucceeds5() {45        List<String> list = new ArrayList<>();46        IndexOutOfBoundsException thrown = catchThrowableByType(() -> {47            list.get(0);48        }, IndexOutOfBoundsException.class);49        assertThat(thrown).isInstanceOf(IndexOutOfBoundsException.class);50    }51    public void whenExceptionThrown_thenAssertionSucceeds6() {52        Optional<String> optional = Optional.empty();53        assertThatThrownBy(() -> {54            optional.get();55        }).isInstanceOf(NoSuchElementException.class);56    }

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.