- Added code for JUnit 5 article
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amedviediev
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>junit5</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>junit5</name>
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<description>Intro to JUnit 5</description>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<java.version>1.8</java.version>
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<!-- Due to a bug in surefire-junit5-5.0.0-ALPHA we use the latest snapshot instead -->
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<junit.gen5.version>5.0.0-SNAPSHOT</junit.gen5.version>
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</properties>
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<repositories>
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<repository>
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<id>snapshots-repo</id>
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<url>https://oss.sonatype.org/content/repositories/snapshots</url>
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<releases>
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<enabled>false</enabled>
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</releases>
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<snapshots>
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<!-- Do NOT cache JUnit 5 snapshot JARs. -->
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<updatePolicy>always</updatePolicy>
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<enabled>true</enabled>
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</snapshots>
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</repository>
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</repositories>
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<pluginRepositories>
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<pluginRepository>
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<id>snapshots-repo</id>
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<url>https://oss.sonatype.org/content/repositories/snapshots</url>
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<releases>
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<enabled>false</enabled>
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</releases>
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<snapshots>
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<!-- Do NOT cache JUnit 5 snapshot JARs. -->
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<updatePolicy>always</updatePolicy>
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<enabled>true</enabled>
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</snapshots>
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</pluginRepository>
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</pluginRepositories>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.1</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.19</version>
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<dependencies>
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<dependency>
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<groupId>org.junit</groupId>
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<artifactId>surefire-junit5</artifactId>
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<version>${junit.gen5.version}</version>
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</dependency>
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</dependencies>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>org.junit</groupId>
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<artifactId>junit5-api</artifactId>
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<version>${junit.gen5.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>
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package com.baeldung;
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import org.junit.gen5.api.Test;
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import static org.junit.gen5.api.Assumptions.assumeFalse;
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import static org.junit.gen5.api.Assumptions.assumeTrue;
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import static org.junit.gen5.api.Assumptions.assumingThat;
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public class AssumptionTest {
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@Test
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void trueAssumption() {
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assumeTrue(5 > 1);
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System.out.println("Was true");
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}
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@Test
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void falseAssumption() {
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assumeFalse(5 < 1);
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System.out.println("Was false");
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}
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@Test
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void assumptionThat() {
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String someString = "Just a string";
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assumingThat(
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someString.equals("Just a string"),
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() -> System.out.println("Assumption was correct")
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);
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}
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}
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package com.baeldung;
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import org.junit.gen5.api.Test;
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import static org.junit.gen5.api.Assertions.assertEquals;
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import static org.junit.gen5.api.Assertions.expectThrows;
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public class ExceptionTest {
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@Test
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void shouldThrowException() {
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Throwable exception = expectThrows(NullPointerException.class, null);
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assertEquals(exception.getClass(), NullPointerException.class);
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}
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}
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package com.baeldung;
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import org.junit.gen5.api.Test;
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import static org.junit.gen5.api.Assertions.assertAll;
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import static org.junit.gen5.api.Assertions.assertEquals;
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import static org.junit.gen5.api.Assertions.assertTrue;
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class FirstTest {
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@Test
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void lambdaExpressions() {
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String string = "";
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assertTrue(() -> string.isEmpty(), "String should be empty");
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}
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@Test
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void groupAssertions() {
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int[] numbers = {0,1,2,3,4};
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assertAll("numbers", () -> {
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assertEquals(numbers[0], 1);
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assertEquals(numbers[3], 3);
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assertEquals(numbers[4], 1);
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});
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}
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}
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package com.baeldung;
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import org.junit.gen5.api.*;
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import java.util.EmptyStackException;
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import java.util.Stack;
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public class NestedTest {
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Stack<Object> stack;
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boolean isRun = false;
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@Test
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@DisplayName("is instantiated with new Stack()")
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void isInstantiatedWithNew() {
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new Stack<Object>();
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}
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@Nested
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@DisplayName("when new")
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class WhenNew {
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@BeforeEach
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void init() {
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stack = new Stack<Object>();
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}
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@Test
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@DisplayName("is empty")
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void isEmpty() {
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Assertions.assertTrue(stack.isEmpty());
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}
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@Test
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@DisplayName("throws EmptyStackException when popped")
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void throwsExceptionWhenPopped() {
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Assertions.expectThrows(EmptyStackException.class, () -> stack.pop());
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}
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@Test
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@DisplayName("throws EmptyStackException when peeked")
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void throwsExceptionWhenPeeked() {
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Assertions.expectThrows(EmptyStackException.class, () -> stack.peek());
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}
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@Nested
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@DisplayName("after pushing an element")
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class AfterPushing {
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String anElement = "an element";
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@BeforeEach
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void init() {
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stack.push(anElement);
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}
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@Test
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@DisplayName("it is no longer empty")
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void isEmpty() {
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Assertions.assertFalse(stack.isEmpty());
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}
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@Test
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@DisplayName("returns the element when popped and is empty")
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void returnElementWhenPopped() {
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Assertions.assertEquals(anElement, stack.pop());
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Assertions.assertTrue(stack.isEmpty());
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}
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@Test
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@DisplayName("returns the element when peeked but remains not empty")
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void returnElementWhenPeeked() {
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Assertions.assertEquals(anElement, stack.peek());
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Assertions.assertFalse(stack.isEmpty());
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}
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}
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}
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}
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