Ruby Rspec Expect

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But there are other matchers you can use.

Ruby rspec expect.

Rspec expectations ships with a number of built in matchers. This part of the rspec philosophy an example is not just a test it s also a specification a spec. Matchers are how rspec compares the output of your method with your expected value. Expect nil to be nil where something is a predicate method like empty.

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. This is a verification step where we check that a specific.

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. The parts of rspec are. For example the be something matcher. 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.

The spec runner providing a rich command line program flexible and customizable reporting and an api to organize your code examples. In other words an example both documents and tests the expected behavior of your ruby code. Rspec expectations lets you express expected outcomes on an object in an example. The rspec gem comes packaged with all you need to get started including five gems.

In the case of eq rspec uses the operator read more about ruby operators. Gem install rspec expectations contributing. In this case the task is testing ruby code. 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.

The expect keyword is used to define an expectation in rspec. Rspec rspec core rspec expectations rspec mocks and rspec support. Most matchers can also be accessed using the should and should not syntax. Once you ve set up the environment you ll need to cd into the working directory of whichever repo you want to work in.

See using should syntax for why we recommend using expect.

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