Ruby Rspec Expect

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.

Ruby rspec expect.

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. The expect keyword is used to define an expectation in rspec. Rspec expectations lets you express expected outcomes on an object in an example.

Each matcher can be used with expect to or expect not to to define positive and negative expectations respectively on an object. Matchers are how rspec compares the output of your method with your expected value. But there are other matchers you can use. 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.

Rspec expectations ships with a number of built in matchers. In this case the task is testing ruby code. See using should syntax for why we recommend using expect. This is a verification step where we check that a specific.

Most matchers can also be accessed using the should and should not syntax. Expect nil to be nil where something is a predicate method like empty. For example the be something matcher. In the future the default may be changed to only enable the expect syntax.

This part of the rspec philosophy an example is not just a test it s also a specification a spec. Gem install rspec expectations contributing. The rspec gem comes packaged with all you need to get started including five gems.

If you want to use rspec expectations with another tool like test unit minitest or cucumber you can install it directly. The parts of rspec are. In the case of eq rspec uses the operator read more about ruby operators. The spec runner providing a rich command line program flexible and customizable reporting and an api to organize your code examples.

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.