By Enrique Amodeo
Learn how Behavior-driven improvement should help to write down software program that's extra modular and has much less defects.
Avoid universal error in checking out, simplify your try suites, and lead them to extra maintainable utilizing a really pragmatic method of BDD.
Who This e-book Is For
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This way, we can ask them later what happened during our assertion phase. • Mocks: These are self-validating spies that can be programmed during the set up phase with the expected interaction. If some interaction happens that is not expected, they would fail during the assertion phase. We can use spies in the assertion phase of the test and stubs in the set up phase, so it is common that a test double is both a spy and a stub. In this book, we will mostly use the first three types, but not mocks, so don't worry much about them.
I will explain the exact meaning of these parameters in a moment. For now, note that, to execute Mocha, we need to find out where NPM has installed the executable of the tool. A package can be a simple library, or it can also contain an executable command-line tool, as is the case with Mocha. NPM always will install this executable in the node_modules/. bin/mocha in order to invoke Mocha. This would not have been necessary if we had installed Mocha as a global package using the -g option: $ me@~/validator> npm install mocha -g This would have installed Mocha as a utility tool available in our global PATH.
Let's have a look at how it works: tests FEATURES F6 X F5 X F4 X F3 X F1 X X X X X F2 X X X X X C1 C2 C3 C4 C5 COMPONENTS (time) progress In the preceding image, you can see that the system is built incrementally, one component at a time. The idea is that with each increment, a new component is created or an existing one is upgraded in order to support the features. This has the advantage that if a test is failing, we know exactly which component is failing. [ 18 ] Chapter 1 Although this approach works in theory, in practice, it has some problems.