Cloud-Native Applications in Java

Test doubles

Often, the functionality under test depends on components and APIs which are independently being developed by other teams, which has the following disadvantages:

• They may not be available for testing at the time of development of your functionality
• They may not be always available and be set up with the data required for testing various cases
• Using the actual components each time may be slower

Hence, the concept of a test double became popular. A test double (like a stunt double in a movie) is a component/API that replaces the actual component and mimics its behavior. The test double component is typically a lightweight and easy-to-change component that is under the control of the team building the functionality, unlike the ...