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

How to use assertThatThrownBy method of org.assertj.core.api.Assertions class

Best Assertj code snippet using org.assertj.core.api.Assertions.assertThatThrownBy

Source:AssertjTest.java

...7import java.util.List;8import java.util.Map;9import static org.assertj.core.api.Assertions.as;10import static org.assertj.core.api.Assertions.assertThat;11import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;12public class AssertjTest {13    // assert string14    @Test15    void test_string_ok() {16        String name = "I am Mkyong!";17        assertThat(name)18                .as("if failed display this msg!")19                .isEqualTo("I am Mkyong!")20                .isEqualToIgnoringCase("I AM mkyong!")21                .startsWith("I")22                .endsWith("!")23                .containsIgnoringCase("mkyong");24    }25    // assert list26    @Test27    void test_list_ok() {28        List<String> list = Arrays.asList("Java", "Rust", "Clojure");29        assertThat(list)30                .hasSize(3)31                .contains("Java", "Clojure")32                .contains("Java", Index.atIndex(0))33                .contains("Rust", Index.atIndex(1))34                .contains("Clojure", Index.atIndex(2))35                .doesNotContain("Node JS");36    }37    // assert map38    @Test39    void test_map_ok() {40        Map<String, Object> map = new HashMap<>();41        map.put("name", "mkyong");42        assertThat(map)43                .hasSize(1)44                .extractingByKey("name", as(InstanceOfAssertFactories.STRING))45                .isEqualToIgnoringCase("mkyong")46                .startsWith("mkyong");47        assertThat(map).extracting("name")48                .isEqualTo("mkyong");49        Map<String, Object> map2 = new HashMap<>();50        map2.put("number", 999);51        assertThat(map2)52                .hasSize(1)53                .extractingByKey("number", as(InstanceOfAssertFactories.INTEGER))54                .isEqualTo(999);55    }56    // assert exception57    @Test58    void test_exception_ok() {59        assertThatThrownBy(() -> divide(1, 0))60                .isInstanceOf(ArithmeticException.class)61                .hasMessageContaining("zero")62                .hasMessage("/ by zero");63        assertThatThrownBy(() -> {64            List<String> list = Arrays.asList("one", "two");65            list.get(2);66        })67                .isInstanceOf(IndexOutOfBoundsException.class)68                .hasMessageContaining("Index 2 out of bounds");69    }70    int divide(int input, int divide) {71        return input / divide;72    }73}...

Source:Java8StyleAssertions.java

1package com.baeldung.assertj.exceptions;2import static org.assertj.core.api.Assertions.assertThatThrownBy;3import static org.assertj.core.api.Assertions.assertThat;4import static org.assertj.core.api.Assertions.assertThatExceptionOfType;5import static org.assertj.core.api.Assertions.catchThrowable;6import java.io.IOException;7import java.util.ArrayList;8import java.util.Arrays;9import org.junit.Test;10public class Java8StyleAssertions {11    @Test12    public void whenGettingOutOfBoundsItem_thenIndexOutOfBoundsException() {13        assertThatThrownBy(() -> {14            ArrayList<String> myStringList = new ArrayList<String>(Arrays.asList("Strine one", "String two"));15            myStringList.get(2);16        }).isInstanceOf(IndexOutOfBoundsException.class)17            .hasMessageStartingWith("Index: 2")18            .hasMessageContaining("2")19            .hasMessageEndingWith("Size: 2")20            .hasMessageContaining("Index: 2, Size: 2")21            .hasMessage("Index: %s, Size: %s", 2, 2)22            .hasMessageMatching("Index: \\d+, Size: \\d+")23            .hasNoCause();24    }25    @Test26    public void whenWrappingException_thenCauseInstanceOfWrappedExceptionType() {27        assertThatThrownBy(() -> {28            try {29                throw new IOException();30            } catch (IOException e) {31                throw new RuntimeException(e);32            }33        }).isInstanceOf(RuntimeException.class)34            .hasCauseInstanceOf(IOException.class)35            .hasStackTraceContaining("IOException");36    }37    @Test38    public void whenDividingByZero_thenArithmeticException() {39        assertThatExceptionOfType(ArithmeticException.class).isThrownBy(() -> {40            int numerator = 10;41            int denominator = 0;...

Source:BaseFridgeShelfTest.java

...5import org.junit.jupiter.api.Test;6import static ar.net.mgardos.vsfridge.core.component.base.BaseSensors.INVALID_SENSORS_QUANTITY;7import static ar.net.mgardos.vsfridge.core.component.base.BaseSensors.UNABLE_TO_ADD_SENSOR;8import static org.assertj.core.api.Assertions.assertThat;9import static org.assertj.core.api.Assertions.assertThatThrownBy;10class BaseFridgeShelfTest {11	private FridgeShelf fridgeShelf;12	@BeforeEach13	void setUp() {14	}15	@Test16	public void testCreateDefaultShelf() {17		fridgeShelf = new BaseFridgeShelf();18		assertThat(fridgeShelf.hasSensors()).isFalse();19		assertThat(fridgeShelf.hasCapacityForSensors()).isTrue();20	}21	@Test22	public void testCreateShelfForNoSensors() {23		fridgeShelf = new BaseFridgeShelf(0);24		assertThat(fridgeShelf.hasCapacityForSensors()).isFalse();25		assertThat(fridgeShelf.hasSensors()).isFalse();26	}27	@Test28	public void testCreateShelfWithInvalidQuantity() {29		SoftAssertions assertions = new SoftAssertions();30		assertions.assertThatThrownBy(() -> new BaseFridgeShelf(null)).isInstanceOf(NullPointerException.class)31		          .hasMessage(INVALID_SENSORS_QUANTITY);32		assertions.assertThatThrownBy(() -> new BaseFridgeShelf(-1)).isInstanceOf(IllegalArgumentException.class)33		          .hasMessage(INVALID_SENSORS_QUANTITY);34		assertions.assertAll();35	}36	@Test37	public void testAddSensorWithInvalidSensor() {38		fridgeShelf = new BaseFridgeShelf(1);39		assertThatThrownBy(() -> fridgeShelf.addSensor(null)).isInstanceOf(NullPointerException.class)40		                                                     .hasMessage(UNABLE_TO_ADD_SENSOR);41	}42}

assertThatThrownBy

Using AI Code Generation

1package com.ack.junit.assertj;2import org.junit.Test;3import static org.assertj.core.api.Assertions.assertThatThrownBy;4public class AssertJExceptionTest {5  public void testAssertJException() {6    assertThatThrownBy( () -> { throw new Exception( "expected exception" ); } )7        .isInstanceOf( Exception.class )8        .hasMessage( "expected exception" );9  }10}

assertThatThrownBy

Using AI Code Generation

1import static org.assertj.core.api.Assertions.assertThatThrownBy;2public class 1 {3    public static void main(String[] args) {4        assertThatThrownBy(() -> {5            throw new Exception("error");6        }).isInstanceOf(Exception.class);7    }8}

assertThatThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.*;3public class 1 {4    public void test() {5        assertThatThrownBy(() -> {6        }).isInstanceOf(Exception.class)7          .hasMessageContaining("message")8          .hasMessageStartingWith("message")9          .hasMessageEndingWith("message")10          .hasMessageMatching("message")11          .hasMessageMatching("message")12          .hasCauseInstanceOf(Exception.class)13          .hasCauseMessageContaining("message")14          .hasCauseMessageStartingWith("message")15          .hasCauseMessageEndingWith("message")16          .hasCauseMessageMatching("message")17          .hasNoCause();18    }19}20Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:6)21Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:7)22Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:8)23Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:9)24Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:10)25Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:11)26Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:12)27Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:13)28Exception in thread "main" org.junit.ComparisonFailure: expected:<...e[Exception] but was:<...e[AssertionError]> at 1.test(1.java:14)

assertThatThrownBy

Using AI Code Generation

1import org.junit.jupiter.api.Test;2import static org.assertj.core.api.Assertions.assertThatThrownBy;3public class 1 {4    void test() {5        assertThatThrownBy(() -> {6            throw new RuntimeException("boom!");7        }).isInstanceOf(RuntimeException.class)8                .hasMessageContaining("boom");9    }10}11import org.junit.jupiter.api.Test;12import static org.assertj.core.api.Assertions.assertThatExceptionOfType;13public class 2 {14    void test() {15        assertThatExceptionOfType(RuntimeException.class)16                .isThrownBy(() -> {17                    throw new RuntimeException("boom!");18                }).withMessageContaining("boom");19    }20}21import org.junit.jupiter.api.Test;22import static org.junit.jupiter.api.Assertions.assertThrows;23public class 3 {24    void test() {25        Exception exception = assertThrows(RuntimeException.class, () -> {26            throw new RuntimeException("boom!");27        });28        String expectedMessage = "boom!";29        String actualMessage = exception.getMessage();30        assertTrue(actualMessage.contains(expectedMessage));31    }32}33import org.junit.jupiter.api.Test;34import static org.junit.jupiter.api.Assertions.assertThrows;35public class 4 {36    void test() {37        Exception exception = assertThrows(RuntimeException.class, () -> {38            throw new RuntimeException("boom!");39        });40        String expectedMessage = "boom!";41        String actualMessage = exception.getMessage();42        assertTrue(actualMessage.contains(expectedMessage));43    }44}45import org.junit.jupiter.api.Test;46import static org.junit.jupiter.api.Assertions.assertThrows;47public class 5 {48    void test() {49        Exception exception = assertThrows(RuntimeException.class, () -> {50            throw new RuntimeException("boom!");51        });52        String expectedMessage = "boom!";53        String actualMessage = exception.getMessage();54        assertTrue(actualMessage.contains(expectedMessage));55    }56}57import org.junit.jupiter.api.Test;58import static org.junit.jupiter.api.Assertions.assertThrows

assertThatThrownBy

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.junit.Test;3import java.io.IOException;4public class Test1 {5    public void test1() {6        Assertions.assertThatThrownBy(() -> {7            throw new IOException("test");8        }).isInstanceOf(IOException.class).hasMessage("test");9    }10}

assertThatThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.assertThatThrownBy;3public class AssertionsDemo {4	public void testAssertThatThrownBy() {5		assertThatThrownBy(() -> {6			throw new IllegalArgumentException("a message");7		}).isInstanceOf(IllegalArgumentException.class)8		.hasMessage("a message");9	}10}11	at org.assertj.core.api.Assertions.fail(Assertions.java:1293)12	at org.assertj.core.api.Assertions.assertThatThrownBy(Assertions.java:1247)13	at AssertionsDemo.testAssertThatThrownBy(AssertionsDemo.java:13)14Example 2: Using assertThatThrownBy() method to check a particular exception is thrown or not15import org.junit.Test;16import static org.assertj.core.api.Assertions.assertThatThrownBy;17public class AssertionsDemo {18	public void testAssertThatThrownBy() {19		assertThatThrownBy(() -> {20			throw new IllegalArgumentException("a message");21		}).isInstanceOf(IllegalArgumentException.class)22		.hasMessage("a message");23	}24}25	at org.assertj.core.api.Assertions.fail(Assertions.java:1293)26	at org.assertj.core.api.Assertions.assertThatThrownBy(Assertions.java:1247)27	at AssertionsDemo.testAssertThatThrownBy(AssertionsDemo.java:13)28The exception is thrown by assertThatThrownBy() method

assertThatThrownBy

Using AI Code Generation

1import org.junit.jupiter.api.Test;2import static org.assertj.core.api.Assertions.assertThatThrownBy;3public class 1 {4    void test() {5        assertThatThrownBy(() -> {6            throw new RuntimeException("boom!");7        }).isInstanceOf(RuntimeException.class)8                .hasMessageContaining("boom");9    }10}11import org.junit.jupiter.api.Test;12import static org.assertj.core.api.Assertions.assertThatExceptionOfType;13public class 2 {14    void test() {15        assertThatExceptionOfType(RuntimeException.class)16                .isThrownBy(() -> {17                    throw new RuntimeException("boom!");18                }).withMessageContaining("boom");19    }20}21import org.junit.jupiter.api.Test;22import static org.junit.jupiter.api.Assertions.assertThrows;23public class 3 {24    void test() {25        Exception exception = assertThrows(RuntimeException.class, () -> {26            throw new RuntimeException("boom!");27        });28        String expectedMessage = "boom!";29        String actualMessage = exception.getMessage();30        assertTrue(actualMessage.contains(expectedMessage));31    }32}33import org.junit.jupiter.api.Test;34import static org.junit.jupiter.api.Assertions.assertThrows;35public class 4 {36    void test() {37        Exception exception = assertThrows(RuntimeException.class, () -> {38            throw new RuntimeException("boom!");39        });40        String expectedMessage = "boom!";41        String actualMessage = exception.getMessage();42        assertTrue(actualMessage.contains(expectedMessage));43    }44}45import org.junit.jupiter.api.Test;46import static org.junit.jupiter.api.Assertions.assertThrows;47public class 5 {48    void test() {49        Exception exception = assertThrows(RuntimeException.class, () -> {50            throw new RuntimeException("boom!");51        });52        String expectedMessage = "boom!";53        String actualMessage = exception.getMessage();54        assertTrue(actualMessage.contains(expectedMessage));55    }56}57import org.junit.jupiter.api.Test;58import static org.junit.jupiter.api.Assertions.assertThrows

assertThatThrownBy

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.junit.Test;3import java.io.IOException;4public class Test1 {5    public void test1() {6        Assertions.assertThatThrownBy(() -> {7            throw new IOException("test");8        }).isInstanceOf(IOException.class).hasMessage("test");9    }10}

assertThatThrownBy

Using AI Code Generation

1import org.junit.Test;2import static org.assertj.core.api.Assertions.*;3import java.io.IOException;4public class AssertJTest {5    public void test() {6        assertThatThrownBy(() -> {7            throw new IOException("Exception thrown");8        }).isInstanceOf(IOException.class).hasMessage("Exception thrown");9    }10}

assertThatThrownBy

Using AI Code Generation

1import java.util.*;2import org.junit.*;3import static org.assertj.core.api.Assertions.*;4public class 1 {5   public void testAssertThatThrownBy() {6      assertThatThrownBy(() -> { throw new Exception("An error occurred"); }).hasMessage("An error occurred");7   }8}9	at org.junit.Assert.assertEquals(Assert.java:115)10	at org.junit.Assert.assertEquals(Assert.java:144)11	at org.junit.Assert.assertEquals(Assert.java:155)12	at 1.testAssertThatThrownBy(1.java:8)13assertThatThrownBy() method14The assertThatThrownBy() method checks whether the exception thrown by

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.