Ruby Rspec Expect

Rspecのshouldはもう古い 新しい記法expectを使おう should and should not syntax に説明があります by default both expect and should syntaxes are available.

Ruby rspec expect.

Expect nil to be nil where something is a predicate method like empty. Rspec expectations ships with a number of built in matchers. Rspecのversion2 11から old spec rb foo should eq bar foo should not eq bar を new spec rb expect foo to eq bar. This is a verification step where we check that a specific.

At the most basic level rspec is a domain specific language written in ruby or for the rest of us a language specialized for a particular task. For example the be something matcher. Rspec expectations lets you express expected outcomes on an object in an example. Once you ve set up the environment you ll need to cd into the working directory of whichever repo you want to work in.

Rspec rspec core rspec expectations rspec mocks and rspec support. In the future the default may be changed to only enable the expect syntax. The spec runner providing a rich command line program flexible and customizable reporting and an api to organize your code examples.

In this case the task is testing ruby code. The expect keyword is used to define an expectation in rspec. Matchers are how rspec compares the output of your method with your expected value. Gem install rspec expectations contributing.

Rspec is composed of multiple libraries which are designed to work together or can be used independently with other testing tools like cucumber or minitest. This part of the rspec philosophy an example is not just a test it s also a specification a spec. Each matcher can be used with expect to or expect not to to define positive and negative expectations respectively on an object. If you want to use rspec expectations with another tool like test unit minitest or cucumber you can install it directly.

The rspec gem comes packaged with all you need to get started including five gems. Most matchers can also be accessed using the should and should not syntax. In the case of eq rspec uses the operator read more about ruby operators. The parts of rspec are.

See using should syntax for why we recommend using expect.