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# RSpec::Its [![Build Status](https://travis-ci.org/rspec/rspec-its.svg)](https://travis-ci.org/rspec/rspec-its)

RSpec::Its provides the `its` method as a short-hand to specify the expected value of an attribute.

## Installation

Add this line to your application's Gemfile:

    gem 'rspec-its'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install rspec-its

And require it as:

    require 'rspec/its'

## Usage

Use the `its` method to generate a nested example group with
a single example that specifies the expected value of an attribute of the
subject using `should`, `should_not` or `is_expected`.

`its` accepts a symbol or a string, and a block representing the example.

    its(:size)    { should eq(1) }
    its("length") { should eq(1) }

You can use a string with dots to specify a nested attribute (i.e. an
attribute of the attribute of the subject).

    its("phone_numbers.size") { should_not eq(0) }

The following expect-style method is also available:

    its(:size) { is_expected.to eq(1) }
    
as is this alias for pluralized use:

    its(:keys) { are_expected.to eq([:key1, :key2])
    
When the subject implements the `[]` operator, you can pass in an array with a single key to
refer to the value returned by that operator when passed that key as an argument.

    its([:key]) { is_expected.to eq(value) }

For hashes, multiple keys within the array will result in successive accesses into the hash. For example:

    subject { {key1: {key2: 3} } }
    its([:key1, :key2]) { is_expected.to eq(3)

For other objects, multiple keys within the array will be passed as separate arguments in a single method call to [], as in:

    subject { Matrix[ [:a, :b], [:c, :d] ] }
    its([1,1]) { should eq(:d) }

Metadata arguments are supported.

    its(:size, focus: true) { should eq(1) }

## Contributing

1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request