PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.

Mockito, Automatic Test Suite Generation for Java

JMockit, An automated testing toolkit for Java

EasyMock, Easy mocking. Better testing.

EvoSuite, Automatic Test Suite Generation for Java

Harbor is an an open source trusted cloud native registry project that stores, signs, and scans content. Harbor extends the open source Docker Distribution by adding the functionalities usually required by users such as security, identity and management. Having a registry closer to the build and run environment can improve the image transfer efficiency. Harbor supports replication of images between registries, and also offers advanced security features such as user management, access control and activity auditing.

将一个类的接口，转换成客户期望的另一个接口。适配器让原本接口不兼容的类可以合作无间。

提供一种方法顺序访问一个聚合对象中的各个元素，而又不暴露其内部的表示