Overview of OpenTest4J framework in the Java library

OpenTest4j is a test framework used in the Java library.It aims to provide a simple, flexible and powerful way for developers to write and operate unit testing. The design concept of OpenTest4J is to make the test code easy to write and maintain.It provides a set of simple and powerful assertions to verify the expected behavior of code.These assertions can check whether the values are equal, whether the object is empty, and the abnormal abnormality of the expected. Here are some examples of assertions often used in some OpenTest4j: import org.opentest4j.AssertionFailedError; import static org.opentest4j.Assertions.*; public class MyTestClass { public void testAddition() { int result = 2 + 2; // Use the assertequals method to assert that two values are equal assertEquals(4, result); } public void testString() { String message = "Hello, World!"; // Use the asserttrue method to assert conditions assertTrue(message.startsWith("Hello")); // Use the assertFalse method to assert the condition as fake assertFalse(message.endsWith("Java")); } public void testException() { try { // Call a method that may be thrown out of exception throw new NullPointerException(); } catch (NullPointerException ex) { // Using the ASSERTTHROWS method to assert assertThrows(NullPointerException.class, () -> { throw ex; }); } } } In addition to providing a wealth of assertions, OpenTest4j also supports custom assertions.This means that developers can add custom assertions according to their needs to further expand the ability to test. OpenTest4j also provides some practical tools related to testing, including test report generation, test execution sequential control, test parameterization, etc. In general, OpenTest4J is a powerful and flexible test framework that can help developers write and run efficient unit testing.Both beginners and experienced developers can improve their code quality and development efficiency by using OpenTest4J.