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Part I: Junit 5

  1. Documentation page of Junit 5

JUnit 5 was launched in 2017 and is composed of several modules: JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage

  1. Some Assertions - jupiter :

assertEquals(expected, actual)

assertTrue(condition) /* boolean */

assertFalse(condition) /* boolean */

assertNull(object) /* object */

assertNotNull(object) /* object */

assertSame(expected, actual) /* compare reference */

assertNotSame(expected, actual) /* compare reference */

assertIterableEquals(expected, actual) /* compare collection */

assertThrows(expected, block) /* throw exception */

assertAll(block) /* execute multiple assertions */

assertAll(
 () -> assertEquals(expected, actual),
 () -> assertTrue(condition),
 () -> assertSame(expected, actual),
 () -> assertEquals(expected, actual),
 () -> assertEquals(expected, actual),
 () -> assertEquals(expected, actual)
  1. Some Assertions - assertj :

assertThat(actual).isEqualTo(expected) /* or assertThat(actual).isNotEqualTo(expected) */

assertThat(actual).isNull() /* or assertThat(actual).isNotNull() */

assertThat(actual).isInstanceOf(expectedClass) /* for exception */

assertThat(actual).isNotInstanceOf(expectedClass)

assertThat(actual).isIn(expected) /* for collection (we can use also isNotIn) */

assertThat(actual).(expected)

assertThat(actual).isBetween(expected, expected) /* for number : isCloseTo / isGreaterThan / isLessThan / ... */

assertThat(actual).isEmpty() /* for collection */

assertThat(actual).hasSize(expected) /* for collection */

assertThat(actual).doesNotContain(expected) /* for collection : startsWith / endsWith */

assertThat(actual).matches(expected) /* for string */

assertThat(actual).doesNotMatch(expected) /* for string */

  1. Setting up tearDown :

@BeforeEach /* for each test */

@AfterEach

@BeforeAll /* for all tests */

@AfterAll

  • Life cycle of tearDown is as follows : @BeforeAll > @BeforeEach > @Test > @AfterEach > @AfterAll
  1. Some annotations from junit 5 :

@DisplayName("Test name") /* for test name */

@Nested /* in case that we have several test suite which start with the same name */

@Disabled /* disable test */

Part II: Mockito

The difference between @mock and @Mockbean is that @Mockbean is a bean in the spring context and @mock is a mock object. So, the only difference between @MockBean and @Mock that one will inject the mock into the Spring ApplicationContext (Mockbean) and the other won't

  1. Stub :

when : asking for data verify : telling by doing

  1. Matchers : we use matchers when we're not interested in the value of arguments.

anyString() eq() /* when we use argument matchers, we should make all parameters matchers */

  1. BDD mockito style :

We replace when by given(), and verify by then()