The Cucumber for Java Book

Dependency Injection

Dependency injection (DI) is a technique that allows us to isolate a class from its concrete dependencies until runtime.^[34] Often this is used to defer the decision about which actual implementation of an interface we’re going to use. On this occasion, however, Cucumber uses a dependency injection framework to create a single instance of a class and share that instance between all the step definition classes that need to use it. (We’ll talk about Cucumber’s use of DI much more in Chapter 11, ​ Simplifying Design with Dependency Injection ​.)

Cucumber ships with integrations to several popular DI frameworks to choose from. We’ll use PicoContainer^[35] which is probably the most lightweight and is also available under the ...