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class MethodSourceCase2ExampleTest {
    
    @DisplayName("Payment status")
    @ParameterizedTest(name = "The payment with status {0} returns the message {1}")
    @MethodSource("statusList")
    void paymentStatus(Status status, String message) {
        String auditedPayment = auditService.getPayments(status);
        assertThat(status).isEqualTo(message);
    }

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class MyTestClass {
    
    @DisplayName("Date must be from the current year")
    @ParameterizedTest(name = "Check the current year of {0}")
    @MethodSource("dateList")
    void myTest(LocalDate date) {
        assertThat(date).hasYear(2023);
    }

    static Stream<Arguments> dateList() {

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Title

Good testing practices in an open-source project

Description

Nowadays the contribution guide in every open-source project is not sufficient to describe the approaches, techniques, and how people solve break changes.

We all know: they are the most democratic projects we can work on, but sometimes not follow basic practices to elevate the project quality.

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Links

AssertJ examples

Custom Assertion

• Custom assertion methods based on a context (Simulation)
• Custom Soft Assertion using the methods from the Custom Assertion
• Test class using both Custom and Custom Soft Assertion

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import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

class SoftAssertionJunit5Test {
    @Test
    void softAssertionUsingJUnit5() {
        var person = Person.builder().name("John").phoneNumber(null).age(16).build();

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import org.assertj.core.api.SoftAssertions;
import org.junit.jupiter.api.Test;

class SoftAssertionTest {

    @Test
    void softAssertionUsingAssertJ() {
        var person = Person.builder().name("John").phoneNumber(null).age(16).build();

        SoftAssertions.assertSoftly(softly -> {

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import org.assertj.core.api.SoftAssertions;
import org.junit.jupiter.api.Test;

class HardAssertionTest {

    @Test
    void hardAssertion() {
        var person = Person.builder().name("John").phoneNumber(null).age(16).build();

        assertThat(person.getName()).isNotBlank();

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public class SoftAssertTestNGTest {

    @Test
    public void testNGSoftAssertion() {
        var person = Person.builder().name("John").phoneNumber(null).age(16).build();
        SoftAssert softAssert = new SoftAssert();

        softAssert.assertEquals(person.getName(), "John");
        softAssert.assertNotNull(person.getPhoneNumber(), "Phone number cannot be null");
        softAssert.assertEquals(person.getAge(), 25, "Age should be equal");

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class AgeTest {

    @DisplayName("Valid ages")
    @ParameterizedTest(name = "{0} is a valid age for the requirement 18 to 30")
    @ValueSource(ints = {18, 19, 29, 30})
    void validAges(int age) {
        Assertions.assertThat(isAgeValid(age)).isTrue();
    }

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public class Example {

    private Boolean isAgeValid(int age) {
        return age >= 18 && age <= 30 ? Boolean.TRUE : Boolean.FALSE;
    }
}