JUnit

Last Updated: 2021-11-19

Import @Test

import org.junit.Test;

Import Assertion(assertEquals, etc)

import static org.junit.Assert.*;

Key Conceptions

• Assert: throws exceptions if fail.
• Test: a method annotated with @Test
• Test Class / TestCase: a class contains test methods annotated with @Test
• Test Suite: a group of tests.
• Test Runner: runs test suites.

Methods

optional <message> provide the human-readable error information. optional <delta> provide an error range.

assertEquals

assertEquals([<message>,] <expected>, <actual> [, <delta>]);

assertArrayEquals

assertArrayEquals([<message>,] <expected>, <actual>);

assertSame

assertSame([<message>,] <expected>, <actual>);

assertTure

assertTrue([<message>,] <expression>);

assertNotNull

assertNotNull([<message>,] <expression>);