JUnit 5 Basics: @Test, Lifecycle, Assertions, Assumptions, And More

A comprehensive introduction to JUnit 5 covering the core annotations (@Test, @BeforeAll, @BeforeEach, @AfterEach, @AfterAll), test lifecycle management, assertions (including assertAll, assertThrows, assertTimeout), and assumptions. Also covers visibility changes (package-private suffices), disabling tests with @Disabled and conditional annotations, naming with @DisplayName, tagging with @Tag, and previews advanced features like test interfaces, nested tests with @Nested, and parameterized tests.