https://github.com/rspec/rspec-collection_matchers

Collection cardinality matchers, extracted from rspec-expectations
https://github.com/rspec/rspec-collection_matchers

Last synced: 3 days ago
JSON representation

Collection cardinality matchers, extracted from rspec-expectations

• Host: GitHub
• URL: https://github.com/rspec/rspec-collection_matchers
• Owner: rspec
• License: mit
• Created: 2013-07-22T04:51:15.000Z (about 11 years ago)
• Default Branch: main
• Last Pushed: 2024-08-04T12:18:38.000Z (2 months ago)
• Last Synced: 2024-09-07T22:27:25.204Z (26 days ago)
• Language: Ruby
• Size: 104 KB
• Stars: 192
• Watchers: 15
• Forks: 25
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: Changelog.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE.txt

Awesome Lists containing this project

README

        
# RSpec::CollectionMatchers [![Build Status](https://secure.travis-ci.org/rspec/rspec-collection_matchers.svg?branch=main)](http://travis-ci.org/rspec/rspec-collection_matchers)

RSpec::CollectionMatchers lets you express expected outcomes on collections

of an object in an example.

```ruby

expect(account.shopping_cart).to have_exactly(3).items

```

## Install

Add this line to your application's Gemfile:

    gem 'rspec-collection_matchers'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install rspec-collection_matchers

## Basic usage

First of all, you need to require rspec-collection matchers. Add the following line to your `spec_helper.rb`:

```ruby

require 'rspec/collection_matchers'

```

Using `rspec-collection_matchers` you can match the number of items in a

collection directly, e.g.:

```ruby

it 'matches number of items in a collection' do

  expect([1,2,3]).to have_at_least(3).items

end

```

You can also match the number of items returned by a method on an object, e.g.:

```ruby

class Cart

  def initialize(*products)

    @products = products

  end

  attr_reader :products

end

it 'matches number of items returned from a method' do

  cart = Cart.new('product a', 'product b')

  expect(cart).to have_at_most(2).products

end

```

The last line of the example expresses an expected outcome:

if `cart.products.size <= 2` then the example passes, otherwise it fails with a message like:

    expected at most 2 products, got 3

## Available matchers

```ruby

expect(collection).to have(n).items

expect(collection).to have_exactly(n).items

expect(collection).to have_at_most(n).items

expect(collection).to have_at_least(n).items

expect(collection).to have(:no).items

```

## See also

* [http://github.com/rspec/rspec](http://github.com/rspec/rspec)

* [http://github.com/rspec/rspec-core](http://github.com/rspec/rspec-core)

* [http://github.com/rspec/rspec-expectations](http://github.com/rspec/rspec-expectations)