JUnit5 Jupiter unit and parametrized tests example

ExampleUnitTest.java

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

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import java.util.stream.Stream;

/**
 * build.gradle:
 *
 * plugins {
 *   // for Android project
 *   id 'de.mannodermaus.android-junit5' version '1.9.3.0'
 * }
 *
 * dependencies {
 *   // Writing and executing Unit Tests on the JUnit Platform
 *   testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.0'
 *   testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.10.0'
 *
 *   // JUnit5 support to run JUnit4 tests
 *   testRuntimeOnly 'org.junit.vintage:junit-vintage-engine:5.10.0'
 *
 *   // "Parameterized Tests"
 *   testImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.0'
 *  
 *   // Android Tests
 *   androidTestImplementation 'androidx.test.ext:junit:1.1.5'
 *   androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
 *   androidTestImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.0'
 *   androidTestImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.0'
 * }
 */
public class ExampleUnitTest {

  @Test
  void testAddition() {
    int result = 2 + 2;
    assertEquals(4, result);
  }

  static Stream<Arguments> provideTestArguments() {
    return Stream.of(
        Arguments.of(1, 1),
        Arguments.of(2, 4),
        Arguments.of(3, 9)
    );
  }

  @ParameterizedTest
  @MethodSource("provideTestArguments")
  void testSquare(int input, int expected) {
    int result = input * input;
    assertEquals(expected, result);
  }
}

Sources of the JUnit5 Jupiter plugin for Android project support:

• https://github.com/mannodermaus/android-junit5

without this plugin when you run your JUnit5 tests you get error "No tests found for given includes".