Hello New World – Junit5 ❤️ Kotlin

Talk on Junit5 features and using test first approach for learning Kotlin.

Transcript

1. Hello New World – Junit5 ❤ Kotlin • Areef Shaik • MobiTalk Nov Meetup © 2019 PayPal Inc.
2. Thank you !!
3. Show of Hands..
4. The new world is here!
5. What’s up with Kotlin? Interoperable with Java Safe Concise Tool Friendly Easy
6. Learning Kotlin the new Agile way! UI Tests Integration Tests Unit Tests Ref: https://martinfowler.com/tags/test%20categories.html
7. A brief history of JUnit! Kent Beck writes SUnit (and caught the attention of smalltalkers!) Kent Beck and Erich Gamma ports SUnit to Java - JUnit Was Born (and the world was changed!) JUnit4.12 was released (and stayed there forever!) JUnit Lambda crowdfunding on Indiegogo (and the evolution begins!) 2016 2014 1997 1994
8. Rewrite it all!
9. Rewrite: Why? • IDE / Tools integration • Integrations tightly coupled to JUnit internals by using internal classes or reflection • The execution mode • All test cases need to be known before run • Ambiguous Evolution • Runner vs Rule : conflicting conceptions for test execution
10. All New Junit SupporGng Kotlin!
11. With Periodic Releases!
12. What is JUnit5? Cred : https://github.com/sbrannen
13. • Complete rewrite of JUnit • Improving on what JUnit 4 had to offer with extensibility in mind • Modular, Extensible and Modern • Support for any TestEngine imaginable • Forward and backward compatible • JUnit Platform supports JUnit 3.8, JUnit 4, and JUnit Jupiter What is JUnit5?
14. JUnit5 On Android • JUnit 5 Gradle Plugin only works in pure-Java projects only (As Android uses it’s own plug-in) • For Android JUnit5 support third party plug-in written by Marcel Schnelle • Full support for Unit tests with experimental support for Instrumentation tests
15. Junit5 design In a Nutshell Cred : https://github.com/mannodermaus
16. JUnit Jupiter - The new programming model and extension model in JUnit 5 • Programming Model • How you write tests • Annotations • Assertions • Assumptions • Types of tests • Extension Model • How you and third parties extend the framework • Spring, Mockito, Selenium, …
17. JUnit Jupiter – Annotations Comparison with JUnit4 JUnit 4 JUnit Jupiter @org.junit.Test @org.junit.jupiter.api.Test @Ignore @Disabled @BeforeClass / @AfterClass @BeforeAll / @AfterAll @Before / @After @BeforeEach / @AfterEach org.junit.Assert org.junit.jupiter.api.Assertions org.junit.Assume org.junit.jupiter.api.Assumptions
18. JUnit Jupiter Multi Assertions class AssertAllTests { @Test fun multipleAssertionsTests() { assertAll("All must pass!", { assertTrue(true) }, { assertEquals(1+1, 2) }, { assertFalse(false)} ) } }
19. JUnit Jupiter Assumptions class AssumptionTests { @Test fun assumeTests() { assumeTrue(true) assertEquals(8 / 2, 4) } } class AssumptionTests { @Test fun assumeTests() { assumeTrue(false) assertEquals(8 / 2, 4) } }
20. JUnit Jupiter Throws Assertion class AssertThrowsTests { @Test fun assertDevideByZerTests() { assertThrows<ArithmeticException>{ 1/0 } } }
21. JUnit Jupiter New Annotations – @DisplayName(String) @DisplayName("MobiTalk Junit5 - DisplayName Demo ") class DisplayNameTests { @DisplayName("First test in Junit5") @Test fun firstTest() { assertTrue { true } } }
22. JUnit Jupiter New Annotations – @Enabled / @Disabled @Test @EnabledOnOs(MAC) fun onlyRunThisOnMac() { assertTrue(System.getProperty("user.home").startsWith("/ Users")) } @Test @DisabledOnOs(MAC) fun neverRunThisOnMac() { val osName = System.getProperty("os.name").toLowerCase(Locale.ROOT) assertFalse("darwin" in osName) assertFalse("mac" in osName) }
23. JUnit Jupiter New Annotations – @Nested @DisplayName("Given a Calculator") class CalculatorTests { lateinit var calculator: Calculator @BeforeEach fun beforeEach() { this.calculator = Calculator() } @Nested @DisplayName("When Performing Addition") inner class AddOperation { @Test @DisplayName("Then Computing 1 and 2 equals 3") fun oneAndTwoIsThree() { val actual = calculator.add(1, 2) assertEquals(3, actual) } } }
24. JUnit Jupiter New Annotations – @TestFactory class FactoryTests { @TestFactory fun createDynamicTests(): List<DynamicTest> = listOf( dynamicTest("A Dynamic Test") { assertEquals(4, 2 + 2) }, dynamicTest("Another One") { assertEquals(0, 2 - 2) } ) }
25. JUnit Jupiter New Annotations – @ParameterizedTest & <Source> class ParameterizedTests { @ParameterizedTest @CsvSource("Alice, 5", "Bob, 3", "Charles, 7") fun expectedNameLengths(name: String, expectedLen: Int) { assertEquals(expectedLen, name.length) } }
26. JUnit Jupiter New Annotations – @ParameterizedTest & <Source> Different possibilities for parameter providers: • @ValueSource: char, short, byte, int, long, float, double, String, Class • @NullSource, @EmptySource, and @NullAndEmptySource • @EnumSource • @MethodSource • @CsvSource & @CsvFileSource • @ArgumentsSource & custom ArgumentsProvider (write your own)
27. JUnit Jupiter New Annotations – @RepeatedTest class RepeatTests { @RepeatedTest(5) fun repeatedTest(repetitionInfo: RepetitionInfo ) { assertEquals(5, repetitionInfo.totalRepetitions) } }
28. JUnit Jupiter New Annotations – @RepeatedTest class RepeatWithNameTests { @RepeatedTest( value = 5, name = "I am at {currentRepetition} of {totalRepetitions}" ) fun repeatedTest(repetitionInfo: RepetitionInfo ) { assertEquals(5, repetitionInfo.totalRepetitions) } }
29. References • Junit5 Official • https://junit.org/junit5/docs/current/user-guide/ • https://github.com/junit-team/junit5 • https://github.com/junit-team/junit5-samples • Marcel Schnelle • https://github.com/mannodermaus/android-junit5 • https://github.com/CasterIO/junit5-introduction-examples • TheBowlingGameKata • http://butunclebob.com/ArticleS.UncleBob.TheBowlingGameKata • http://butunclebob.com/files/downloads/Bowling%20Game%20Kata.ppt
30. Thank you !! (Once again :P) • Areef Shaik – PayPal India • https://www.linkedin.com/in/areefhussain/ • https://twitter.com/sm_areef