package com.example.project;

public class Calculator {

	public int add(int a, int b) {
		return a + b;
	}

}

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

import example.util.Calculator;

import org.junit.jupiter.api.Test;

class MyFirstJUnitJupiterTests {

    private final Calculator calculator = new Calculator();

    @Test
    void addition() {
        assertEquals(2, calculator.add(1, 1));
    }

}

...
<properties>
	<junit.jupiter.version>5.9.1</junit.jupiter.version>
	<junit.platform.version>1.9.1</junit.platform.version>
</properties>
...
<dependencies>
    <!-- Only needed to run tests in a version of IntelliJ IDEA that bundles older versions -->
    <dependency>
        <groupId>org.junit.platform</groupId>
        <artifactId>junit-platform-launcher</artifactId>
        <scope>test</scope>
    </dependency>
 	<dependency>
		<groupId>org.junit.platform</groupId>
		<artifactId>junit-platform-suite</artifactId>
		<version>${junit.platform.version}</version>
		<scope>test</scope>
	</dependency>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
		<version>${junit.jupiter.version}</version>
        <scope>test</scope>
    </dependency>
	<dependency>
		<groupId>org.junit.jupiter</groupId>
		<artifactId>junit-jupiter-api</artifactId>
		<version>${junit.jupiter.version}</version>
		<scope>test</scope>
	</dependency>
    <dependency>
    	<groupId>org.junit.jupiter</groupId>
    	<artifactId>junit-jupiter-params</artifactId>
     	<version>${junit.jupiter.version}</version>
     	<scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.vintage</groupId>
        <artifactId>junit-vintage-engine</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.junit</groupId>
            <artifactId>junit-bom</artifactId>
            <version>5.9.1</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

import static org.junit.jupiter.api.Assertions.fail;
import static org.junit.jupiter.api.Assumptions.assumeTrue;

import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;

class StandardTests {

    @BeforeAll
    static void initAll() {
    }

    @BeforeEach
    void init() {
    }

    @Test
    void succeedingTest() {
    }

    @Test
    void failingTest() {
        fail("a failing test");
    }

    @Test
    @Disabled("for demonstration purposes")
    void skippedTest() {
        // not executed
    }

    @Test
    void abortedTest() {
        assumeTrue("abc".contains("Z"));
        fail("test should have been aborted");
    }

    @AfterEach
    void tearDown() {
    }

    @AfterAll
    static void tearDownAll() {
    }

}

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

@DisplayName("A special test case")
class DisplayNameDemo {

    @Test
    @DisplayName("Custom test name containing spaces")
    void testWithDisplayNameContainingSpaces() {
    }

    @Test
    @DisplayName("╯°□°）╯")
    void testWithDisplayNameContainingSpecialCharacters() {
    }

    @Test
    @DisplayName("😱")
    void testWithDisplayNameContainingEmoji() {
    }

}

import static java.time.Duration.ofMillis;
import static java.time.Duration.ofMinutes;
import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTimeout;
import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.concurrent.CountDownLatch;

import example.domain.Person;
import example.util.Calculator;

import org.junit.jupiter.api.Test;

class AssertionsDemo {

    private final Calculator calculator = new Calculator();

    private final Person person = new Person("Jane", "Doe");

    @Test
    void standardAssertions() {
        assertEquals(2, calculator.add(1, 1));
        assertEquals(4, calculator.multiply(2, 2),
                "The optional failure message is now the last parameter");
        assertTrue('a' < 'b', () -> "Assertion messages can be lazily evaluated -- "
                + "to avoid constructing complex messages unnecessarily.");
    }

    @Test
    void groupedAssertions() {
        // In a grouped assertion all assertions are executed, and all
        // failures will be reported together.
        assertAll("person",
            () -> assertEquals("Jane", person.getFirstName()),
            () -> assertEquals("Doe", person.getLastName())
        );
    }

    @Test
    void dependentAssertions() {
        // Within a code block, if an assertion fails the
        // subsequent code in the same block will be skipped.
        assertAll("properties",
            () -> {
                String firstName = person.getFirstName();
                assertNotNull(firstName);

                // Executed only if the previous assertion is valid.
                assertAll("first name",
                    () -> assertTrue(firstName.startsWith("J")),
                    () -> assertTrue(firstName.endsWith("e"))
                );
            },
            () -> {
                // Grouped assertion, so processed independently
                // of results of first name assertions.
                String lastName = person.getLastName();
                assertNotNull(lastName);

                // Executed only if the previous assertion is valid.
                assertAll("last name",
                    () -> assertTrue(lastName.startsWith("D")),
                    () -> assertTrue(lastName.endsWith("e"))
                );
            }
        );
    }

    @Test
    void exceptionTesting() {
        Exception exception = assertThrows(ArithmeticException.class, () ->
            calculator.divide(1, 0));
        assertEquals("/ by zero", exception.getMessage());
    }

    @Test
    void timeoutNotExceeded() {
        // The following assertion succeeds.
        assertTimeout(ofMinutes(2), () -> {
            // Perform task that takes less than 2 minutes.
        });
    }

    @Test
    void timeoutNotExceededWithResult() {
        // The following assertion succeeds, and returns the supplied object.
        String actualResult = assertTimeout(ofMinutes(2), () -> {
            return "a result";
        });
        assertEquals("a result", actualResult);
    }

    @Test
    void timeoutNotExceededWithMethod() {
        // The following assertion invokes a method reference and returns an object.
        String actualGreeting = assertTimeout(ofMinutes(2), AssertionsDemo::greeting);
        assertEquals("Hello, World!", actualGreeting);
    }

    @Test
    void timeoutExceeded() {
        // The following assertion fails with an error message similar to:
        // execution exceeded timeout of 10 ms by 91 ms
        assertTimeout(ofMillis(10), () -> {
            // Simulate task that takes more than 10 ms.
            Thread.sleep(100);
        });
    }

    @Test
    void timeoutExceededWithPreemptiveTermination() {
        // The following assertion fails with an error message similar to:
        // execution timed out after 10 ms
        assertTimeoutPreemptively(ofMillis(10), () -> {
            // Simulate task that takes more than 10 ms.
            new CountDownLatch(1).await();
        });
    }

    private static String greeting() {
        return "Hello, World!";
    }

}

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assumptions.assumeTrue;
import static org.junit.jupiter.api.Assumptions.assumingThat;

import example.util.Calculator;

import org.junit.jupiter.api.Test;

class AssumptionsDemo {

    private final Calculator calculator = new Calculator();

    @Test
    void testOnlyOnCiServer() {
        assumeTrue("CI".equals(System.getenv("ENV")));
        // remainder of test
    }

    @Test
    void testOnlyOnDeveloperWorkstation() {
        assumeTrue("DEV".equals(System.getenv("ENV")),
            () -> "Aborting test: not on developer workstation");
        // remainder of test
    }

    @Test
    void testInAllEnvironments() {
        assumingThat("CI".equals(System.getenv("ENV")),
            () -> {
                // perform these assertions only on the CI server
                assertEquals(2, calculator.divide(4, 2));
            });

        // perform these assertions in all environments
        assertEquals(42, calculator.multiply(6, 7));
    }

}

import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;

@Disabled("Disabled until bug #99 has been fixed")
class DisabledClassDemo {

    @Test
    void testWillBeSkipped() {
    }

}

import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;

class DisabledTestsDemo {

    @Disabled("Disabled until bug #42 has been resolved")
    @Test
    void testWillBeSkipped() {
    }

    @Test
    void testWillBeExecuted() {
    }

}

junit.jupiter.testmethod.order.default = \
    org.junit.jupiter.api.MethodOrderer$OrderAnnotation

package org.wesome.junit5;

import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInstance;

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

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class AppleCalculatorTest {
    public AppleCalculatorTest() {
        System.out.println("AppleCalculatorTest instantiated");
    }

    @BeforeAll
    static void beforeAll() {
        System.out.println("AppleCalculatorTest BeforeAll");
    }

    @AfterAll
    static void afterAll() {
        System.out.println("AppleCalculatorTest AfterAll");
    }

    @BeforeEach
    void beforeEach() {
        System.out.println("AppleCalculatorTest BeforeEach");
    }

    @AfterEach
    void afterEach() {
        System.out.println("AppleCalculatorTest AfterEach");
    }

    private int instanceVar = 0;

    @Test
    void addAppleTest1() {
        instanceVar += 1;
        System.out.println("AppleCalculatorTest.addAppleTest1#instanceVar = " + instanceVar);
        AppleCalculator appleCalculator = new AppleCalculator();
        assertEquals(2, appleCalculator.addApple(1, 1), "1 apple + 1 apple is 2 apple");
    }

    @Test
    void addAppleTest2() {
        instanceVar += 1;
        System.out.println("AppleCalculatorTest.addAppleTest2#instanceVar = " + instanceVar);
        AppleCalculator appleCalculator = new AppleCalculator();
        assertEquals(2, appleCalculator.addApple(1, 1), "1 apple + 1 apple is 2 apple");
    }
}

AppleCalculatorTest instantiated
AppleCalculatorTest BeforeAll
AppleCalculatorTest BeforeEach
AppleCalculatorTest.addAppleTest1#instanceVar = 1
AppleCalculatorTest AfterEach
AppleCalculatorTest BeforeEach
AppleCalculatorTest.addAppleTest2#instanceVar = 2
AppleCalculatorTest AfterEach
AppleCalculatorTest AfterAll

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.EmptyStackException;
import java.util.Stack;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;

@DisplayName("A stack")
class TestingAStackDemo {

    Stack<Object> stack;

    @Test
    @DisplayName("is instantiated with new Stack()")
    void isInstantiatedWithNew() {
        new Stack<>();
    }

    @Nested
    @DisplayName("when new")
    class WhenNew {

        @BeforeEach
        void createNewStack() {
            stack = new Stack<>();
        }

        @Test
        @DisplayName("is empty")
        void isEmpty() {
            assertTrue(stack.isEmpty());
        }

        @Test
        @DisplayName("throws EmptyStackException when popped")
        void throwsExceptionWhenPopped() {
            assertThrows(EmptyStackException.class, stack::pop);
        }

        @Test
        @DisplayName("throws EmptyStackException when peeked")
        void throwsExceptionWhenPeeked() {
            assertThrows(EmptyStackException.class, stack::peek);
        }

        @Nested
        @DisplayName("after pushing an element")
        class AfterPushing {

            String anElement = "an element";

            @BeforeEach
            void pushAnElement() {
                stack.push(anElement);
            }

            @Test
            @DisplayName("it is no longer empty")
            void isNotEmpty() {
                assertFalse(stack.isEmpty());
            }

            @Test
            @DisplayName("returns the element when popped and is empty")
            void returnElementWhenPopped() {
                assertEquals(anElement, stack.pop());
                assertTrue(stack.isEmpty());
            }

            @Test
            @DisplayName("returns the element when peeked but remains not empty")
            void returnElementWhenPeeked() {
                assertEquals(anElement, stack.peek());
                assertFalse(stack.isEmpty());
            }
        }
    }
}

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

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInfo;

@DisplayName("TestInfo Demo")
class TestInfoDemo {

    TestInfoDemo(TestInfo testInfo) {
        assertEquals("TestInfo Demo", testInfo.getDisplayName());
    }

    @BeforeEach
    void init(TestInfo testInfo) {
        String displayName = testInfo.getDisplayName();
        assertTrue(displayName.equals("TEST 1") || displayName.equals("test2()"));
    }

    @Test
    @DisplayName("TEST 1")
    @Tag("my-tag")
    void test1(TestInfo testInfo) {
        assertEquals("TEST 1", testInfo.getDisplayName());
        assertTrue(testInfo.getTags().contains("my-tag"));
    }

    @Test
    void test2() {
    }

}

@TestInstance(Lifecycle.PER_CLASS)
interface TestLifecycleLogger {

    static final Logger logger = Logger.getLogger(TestLifecycleLogger.class.getName());

    @BeforeAll
    default void beforeAllTests() {
        logger.info("Before all tests");
    }

    @AfterAll
    default void afterAllTests() {
        logger.info("After all tests");
    }

    @BeforeEach
    default void beforeEachTest(TestInfo testInfo) {
        logger.info(() -> String.format("About to execute [%s]",
            testInfo.getDisplayName()));
    }

    @AfterEach
    default void afterEachTest(TestInfo testInfo) {
        logger.info(() -> String.format("Finished executing [%s]",
            testInfo.getDisplayName()));
    }

}

interface TestInterfaceDynamicTestsDemo {

    @TestFactory
    default Stream<DynamicTest> dynamicTestsForPalindromes() {
        return Stream.of("racecar", "radar", "mom", "dad")
            .map(text -> dynamicTest(text, () -> assertTrue(isPalindrome(text))));
    }

}

@Tag("timed")
@ExtendWith(TimingExtension.class)
interface TimeExecutionLogger {
}

class TestInterfaceDemo implements TestLifecycleLogger,
        TimeExecutionLogger, TestInterfaceDynamicTestsDemo {

    @Test
    void isEqualValue() {
        assertEquals(1, "a".length(), "is always equal");
    }

}

INFO  example.TestLifecycleLogger - Before all tests
INFO  example.TestLifecycleLogger - About to execute [dynamicTestsForPalindromes()]
INFO  example.TimingExtension - Method [dynamicTestsForPalindromes] took 19 ms.
INFO  example.TestLifecycleLogger - Finished executing [dynamicTestsForPalindromes()]
INFO  example.TestLifecycleLogger - About to execute [isEqualValue()]
INFO  example.TimingExtension - Method [isEqualValue] took 1 ms.
INFO  example.TestLifecycleLogger - Finished executing [isEqualValue()]
INFO  example.TestLifecycleLogger - After all tests

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

import java.util.logging.Logger;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.RepetitionInfo;
import org.junit.jupiter.api.TestInfo;

class RepeatedTestsDemo {

    private Logger logger = // ...

    @BeforeEach
    void beforeEach(TestInfo testInfo, RepetitionInfo repetitionInfo) {
        int currentRepetition = repetitionInfo.getCurrentRepetition();
        int totalRepetitions = repetitionInfo.getTotalRepetitions();
        String methodName = testInfo.getTestMethod().get().getName();
        logger.info(String.format("About to execute repetition %d of %d for %s", //
            currentRepetition, totalRepetitions, methodName));
    }

    @RepeatedTest(10)
    void repeatedTest() {
        // ...
    }

    @RepeatedTest(5)
    void repeatedTestWithRepetitionInfo(RepetitionInfo repetitionInfo) {
        assertEquals(5, repetitionInfo.getTotalRepetitions());
    }

    @RepeatedTest(value = 1, name = "{displayName} {currentRepetition}/{totalRepetitions}")
    @DisplayName("Repeat!")
    void customDisplayName(TestInfo testInfo) {
        assertEquals("Repeat! 1/1", testInfo.getDisplayName());
    }

    @RepeatedTest(value = 1, name = RepeatedTest.LONG_DISPLAY_NAME)
    @DisplayName("Details...")
    void customDisplayNameWithLongPattern(TestInfo testInfo) {
        assertEquals("Details... :: repetition 1 of 1", testInfo.getDisplayName());
    }

    @RepeatedTest(value = 5, name = "Wiederholung {currentRepetition} von {totalRepetitions}")
    void repeatedTestInGerman() {
        // ...
    }

}

INFO: About to execute repetition 1 of 10 for repeatedTest
INFO: About to execute repetition 2 of 10 for repeatedTest
INFO: About to execute repetition 3 of 10 for repeatedTest
INFO: About to execute repetition 4 of 10 for repeatedTest
INFO: About to execute repetition 5 of 10 for repeatedTest
INFO: About to execute repetition 6 of 10 for repeatedTest
INFO: About to execute repetition 7 of 10 for repeatedTest
INFO: About to execute repetition 8 of 10 for repeatedTest
INFO: About to execute repetition 9 of 10 for repeatedTest
INFO: About to execute repetition 10 of 10 for repeatedTest
INFO: About to execute repetition 1 of 5 for repeatedTestWithRepetitionInfo
INFO: About to execute repetition 2 of 5 for repeatedTestWithRepetitionInfo
INFO: About to execute repetition 3 of 5 for repeatedTestWithRepetitionInfo
INFO: About to execute repetition 4 of 5 for repeatedTestWithRepetitionInfo
INFO: About to execute repetition 5 of 5 for repeatedTestWithRepetitionInfo
INFO: About to execute repetition 1 of 1 for customDisplayName
INFO: About to execute repetition 1 of 1 for customDisplayNameWithLongPattern
INFO: About to execute repetition 1 of 5 for repeatedTestInGerman
INFO: About to execute repetition 2 of 5 for repeatedTestInGerman
INFO: About to execute repetition 3 of 5 for repeatedTestInGerman
INFO: About to execute repetition 4 of 5 for repeatedTestInGerman
INFO: About to execute repetition 5 of 5 for repeatedTestInGerman

@ParameterizedTest
@ValueSource(strings = { "racecar", "radar", "able was I ere I saw elba" })
void palindromes(String candidate) {
    assertTrue(StringUtils.isPalindrome(candidate));
}

palindromes(String) ✔
├─ [1] candidate=racecar ✔
├─ [2] candidate=radar ✔
└─ [3] candidate=able was I ere I saw elba ✔

@ParameterizedTest
@ValueSource(ints = { 1, 2, 3 })
void testWithValueSource(int argument) {
    assertTrue(argument > 0 && argument < 4);
}

@ParameterizedTest
@EnumSource(ChronoUnit.class)
void testWithEnumSource(TemporalUnit unit) {
    assertNotNull(unit);
}

@ParameterizedTest
@EnumSource(names = { "DAYS", "HOURS" })
void testWithEnumSourceInclude(ChronoUnit unit) {
    assertTrue(EnumSet.of(ChronoUnit.DAYS, ChronoUnit.HOURS).contains(unit));
}

@ParameterizedTest
@MethodSource("stringProvider")
void testWithExplicitLocalMethodSource(String argument) {
    assertNotNull(argument);
}

static Stream<String> stringProvider() {
    return Stream.of("apple", "banana");
}

@ParameterizedTest
@MethodSource
void testWithDefaultLocalMethodSource(String argument) {
    assertNotNull(argument);
}

static Stream<String> testWithDefaultLocalMethodSource() {
    return Stream.of("apple", "banana");
}

@ParameterizedTest
@MethodSource("stringIntAndListProvider")
void testWithMultiArgMethodSource(String str, int num, List<String> list) {
    assertEquals(5, str.length());
    assertTrue(num >=1 && num <=2);
    assertEquals(2, list.size());
}

static Stream<Arguments> stringIntAndListProvider() {
    return Stream.of(
        arguments("apple", 1, Arrays.asList("a", "b")),
        arguments("lemon", 2, Arrays.asList("x", "y"))
    );
}

package example;

import java.util.stream.Stream;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

class ExternalMethodSourceDemo {

    @ParameterizedTest
    @MethodSource("example.StringsProviders#tinyStrings")
    void testWithExternalMethodSource(String tinyString) {
        // test with tiny string
    }
}

class StringsProviders {

    static Stream<String> tinyStrings() {
        return Stream.of(".", "oo", "OOO");
    }
}

@ParameterizedTest
@CsvSource({
    "apple,         1",
    "banana,        2",
    "'lemon, lime', 0xF1",
    "strawberry,    700_000"
})
void testWithCsvSource(String fruit, int rank) {
    assertNotNull(fruit);
    assertNotEquals(0, rank);
}

@ParameterizedTest(name = "[{index}] {arguments}")
@CsvSource(useHeadersInDisplayName = true, textBlock = """
    FRUIT,         RANK
    apple,         1
#    banana,        2
    'lemon, lime', 0xF1
    strawberry,    700_000
    """)
void testWithCsvSource(String fruit, int rank) {
    // ...
}

[1] FRUIT = apple, RANK = 1
[3] FRUIT = lemon, lime, RANK = 0xF1
[4] FRUIT = strawberry, RANK = 700_000

@ParameterizedTest
@CsvFileSource(resources = "/two-column.csv", numLinesToSkip = 1)
void testWithCsvFileSourceFromClasspath(String country, int reference) {
    assertNotNull(country);
    assertNotEquals(0, reference);
}

@ParameterizedTest
@CsvFileSource(files = "src/test/resources/two-column.csv", numLinesToSkip = 1)
void testWithCsvFileSourceFromFile(String country, int reference) {
    assertNotNull(country);
    assertNotEquals(0, reference);
}

@ParameterizedTest(name = "[{index}] {arguments}")
@CsvFileSource(resources = "/two-column.csv", useHeadersInDisplayName = true)
void testWithCsvFileSourceAndHeaders(String country, int reference) {
    assertNotNull(country);
    assertNotEquals(0, reference);
}

COUNTRY, REFERENCE
Sweden, 1
Poland, 2
"United States of America", 3
France, 700_000

@ParameterizedTest
@ArgumentsSource(MyArgumentsProvider.class)
void testWithArgumentsSource(String argument) {
    assertNotNull(argument);
}
public class MyArgumentsProvider implements ArgumentsProvider {

    @Override
    public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
        return Stream.of("apple", "banana").map(Arguments::of);
    }
}

class TimeoutDemo {

    @BeforeEach
    @Timeout(5)
    void setUp() {
        // fails if execution time exceeds 5 seconds
    }

    @Test
    @Timeout(value = 500, unit = TimeUnit.MILLISECONDS)
    void failsIfExecutionTimeExceeds500Milliseconds() {
        // fails if execution time exceeds 500 milliseconds
    }

    @Test
    @Timeout(value = 500, unit = TimeUnit.MILLISECONDS, threadMode = ThreadMode.SEPARATE_THREAD)
    void failsIfExecutionTimeExceeds500MillisecondsInSeparateThread() {
        // fails if execution time exceeds 500 milliseconds, the test code is executed in a separate thread
    }

}

junit.jupiter.execution.parallel.enabled = true
junit.jupiter.execution.parallel.mode.default = concurrent

대부분의 테스트가 병렬적으로 실행되는데, 어떠한 동기화도 없이 실행되는 클래스라면,@Isolated 어노테이션을 이용하여 격리된 상태로 테스트를 실행할 수 있다. 이런 테스트 클래스는 다른 테스트와 동시에 실행되지 않고, 순차적으로 실행 된다.

@Execution(CONCURRENT)
class SharedResourcesDemo {

    private Properties backup;

    @BeforeEach
    void backup() {
        backup = new Properties();
        backup.putAll(System.getProperties());
    }

    @AfterEach
    void restore() {
        System.setProperties(backup);
    }

    @Test
    @ResourceLock(value = SYSTEM_PROPERTIES, mode = READ)
    void customPropertyIsNotSetByDefault() {
        assertNull(System.getProperty("my.prop"));
    }

    @Test
    @ResourceLock(value = SYSTEM_PROPERTIES, mode = READ_WRITE)
    void canSetCustomPropertyToApple() {
        System.setProperty("my.prop", "apple");
        assertEquals("apple", System.getProperty("my.prop"));
    }

    @Test
    @ResourceLock(value = SYSTEM_PROPERTIES, mode = READ_WRITE)
    void canSetCustomPropertyToBanana() {
        System.setProperty("my.prop", "banana");
        assertEquals("banana", System.getProperty("my.prop"));
    }

}

pom.xml
src
├── main
│   ├── java
│   │   └── com
│   │       └── junit5example
│   │           ├── controller
│   │           │   └── HelloController.java
│   │           ├── demo
│   │           │   └── MySpringBootApplication.java
│   │           └── service
│   │               └── MessageService.java
│   └── resources
│       └── application.properties
└── test
    └── java
        └── com
            └── junit5example
                └── demo
                    ├── Spring_boot_Junit5_service_test.java
                    └── Spring_boot_junit5_api_test.java

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.junt5example</groupId>
	<artifactId>Spring-Boot-Junit5-example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>Spring-Boot-Junit5-example</name>
	<description>Spring boot2 Junit 5 example</description>

	<properties>
		<!-- Dependency versions -->
		<junit.jupiter.version>5.5.2</junit.jupiter.version>
		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
		
		<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		
		<!-- Jupiter API for writing tests -->
		<dependency>
			<groupId>org.junit.jupiter</groupId>
			<artifactId>junit-jupiter-engine</artifactId>
			<version>${junit.jupiter.version}</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<!-- Maven plugin to use perticular java version to compile code -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

package com.junit5example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(scanBasePackages = 
{"com.javabydeveloper.controller", "com.javabydeveloper.service"})
public class MySpringBootApplication {

	public static void main(String[] args) {
		SpringApplication.run(MySpringBootApplication.class, args);
	}

}

package com.junit5example.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.junit5example.service.MessageService;

@RestController
public class HelloController {
	
	@Autowired
	private MessageService messageService;
	
	@GetMapping("/hello")
	public String sayHello(@RequestParam String user) {
		return messageService.getSubscriptionMessage(user);
	}

}

package com.junit5example.service;

import org.springframework.stereotype.Component;

@Component
public class MessageService {
	
	public String getSubscriptionMessage(String user) {
		
		return "Hello "+user+", Thanks for the subscription!";
	}
}

package com.junit5example.demo;

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

import java.net.URI;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.web.util.UriComponentsBuilder;

/*
 * JUnit 5 test for Spring Boot Rest API Conroller
 */

@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class Spring_boot_junit5_api_test {
	
	@Autowired
	private TestRestTemplate restTemplate;

	 @Test
	 @DisplayName("/hello rest api test ")
	 void testMessage() {
		 
		 String user = "Peter";
		 URI targetUrl= UriComponentsBuilder.fromUriString("/hello")                             
				    .queryParam("user", user)                               
				    .build()                                                
				    .encode()                                               
				    .toUri();
		 
	  String message = this.restTemplate.getForObject(targetUrl, String.class);
	  assertEquals("Hello "+user+", Thanks for the subscription!", message);
	 }

}

package com.junit5example.demo;

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

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import com.junit5example.service.MessageService;

/*
 * JUnit 5 test for Spring Boot Component
 */

@SpringBootTest
public class Spring_boot_Junit5_service_test {

	@Autowired
	private MessageService messageService;
	
	 @Test
	 @DisplayName("Subscription message service test ")
	 void testSubscriptionMessage() {
		 
		String user = "Peter";
		 
	    String message = messageService.getSubscriptionMessage(user);
	    assertEquals("Hello "+user+", Thanks for the subscription!", message);
	 }
}

├── pom.xml
└── src
    ├── main
    │   └── java
    │       └── com
    │           └── junit5mockito
    │               └── core
    │                   ├── StartApplication.java
    │                   └── services
    │                       ├── HelloService.java
    │                       └── HelloServiceImpl.java
    └── test
        └── java
            └── com
                └── junit5mockito
                    └── core
                        └── services
                            └── HelloServiceMockTest.java

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
         http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.junit5mockito.spring</groupId>
    <artifactId>testing-junit5-mockito</artifactId>
    <version>1.0</version>

    <properties>
        <java.version>1.8</java.version>
        <junit-jupiter.version>5.3.2</junit-jupiter.version>
        <mockito.version>2.24.0</mockito.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.2.RELEASE</version>
    </parent>

    <dependencies>

        <!-- mvc -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- exclude junit 4 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>junit</groupId>
                    <artifactId>junit</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- junit 5 -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>${junit-jupiter.version}</version>
            <scope>test</scope>
        </dependency>

        <!-- mockito + junit 5 -->
        <!-- exclude this, mockito still ok with junit 5, why need this? -->
        <!--
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-junit-jupiter</artifactId>
            <version>${mockito.version}</version>
            <scope>test</scope>
        </dependency>
        -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.0</version>
            </plugin>

        </plugins>
    </build>

</project>

package com.junit5mockito.core;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class StartApplication {

    public static void main(String[] args) {
        SpringApplication.run(StartApplication.class, args);
    }

}

package com.junit5mockito.core.services;

public interface HelloService {

    String get();

}

package com.junit5mockito.core.services;

import com.junit5mockito.core.repository.HelloRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class HelloServiceImpl implements HelloService {

    @Autowired
    HelloRepository helloRepository;

    @Override
    public String get() {
        return helloRepository.get();
    }

}