Ruby Rspec Expect

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.

Ruby rspec expect.

In this case the task is testing ruby code. This is a verification step where we check that a specific. Each matcher can be used with expect to or expect not to to define positive and negative expectations respectively on an object. 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.

But there are other matchers you can use. The rspec gem comes packaged with all you need to get started including five gems. Matchers are how rspec compares the output of your method with your expected value. Rspec expectations lets you express expected outcomes on an object in an example.

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. Most matchers can also be accessed using the should and should not syntax. This part of the rspec philosophy an example is not just a test it s also a specification a spec. 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.

In the case of eq rspec uses the operator read more about ruby operators. Rspec rspec core rspec expectations rspec mocks and rspec support. Expect nil to be nil where something is a predicate method like empty. The expect keyword is used to define an expectation in rspec.

Rspec expectations ships with a number of built in matchers. In other words an example both documents and tests the expected behavior of your ruby code. If you want to use rspec expectations with another tool like test unit minitest or cucumber you can install it directly. The spec runner providing a rich command line program flexible and customizable reporting and an api to organize your code examples.

Once you ve set up the environment you ll need to cd into the working directory of whichever repo you want to work in. In the future the default may be changed to only enable the expect syntax. Gem install rspec expectations contributing.

If you want to use rspec expectations with rspec just install the rspec gem and rubygems will also install rspec expectations for you along with rspec core and rspec mocks.