[FIXED] Expecting code to raise a throwable spring JUnit

Issue

I am using Java unit tests. When we give the parameters correctly, the unit test should work without any errors (green). But I am getting such an error. Java version 1.8

Expecting code to raise a throwable.

TicTacToeService

public class TicTacToeService {

    public void play(int x, int y) {
        if(x<0)
            throw  new IllegalArgumentException("x cannot be negative");

        if (y < 0)
            throw  new IllegalArgumentException("y cannot be negative");

        if (x > 2)
            throw  new IllegalArgumentException("x cannot be greater than 2");

        if (y > 2)
            throw  new IllegalArgumentException("y cannot be greater than 2");
    }

}

TicTacToeTest

public class TicTacToeTest {

    private TicTacToeService ticTacToeService = new TicTacToeService();

    @Test
    public void givenXIsNegativeExpectException(){
        int x = -1;
        int y = 1;

        Assertions.assertThatThrownBy(() -> ticTacToeService.play(x, y))
                .isInstanceOf(IllegalArgumentException.class)
                .hasMessage("X cannot be negative");
    }

    @Test
    public void givenYIsNegativeExpectException(){
        int x = 1;
        int y = -1;

        Assertions.assertThatThrownBy(() -> ticTacToeService.play(x, y))
                .isInstanceOf(IllegalArgumentException.class)
                .hasMessage("y cannot be negative");
    }

}

dependencies

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation("org.modelmapper:modelmapper:2.3.7")
    implementation 'org.springframework.boot:spring-boot-starter-validation'
    testCompile group: 'junit', name: 'junit', version: '4.4'
    implementation 'org.liquibase:liquibase-core'
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'mysql:mysql-connector-java'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
    testCompile group: 'org.assertj', name: 'assertj-core', version: '3.6.1'
    testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.7.0'
}

What is the problem? please help me

Solution

I suspect that you are using assertThatThrownBy but in reality, you want to use assertThrows. You can check this link for example.

Answered By - Léo Schneider