Project: RSpec Expectations 2.2

Publisher: RSpec

exist matcher

The exist matcher is used to specify that something exists
(as indicated by #exist?):

obj.should exist # passes if obj.exist?

Scenarios

Given

a file named "exist_matcher_spec.rb" with:

class Planet
  attr_reader :name

  def initialize(name)
    @name = name
  end

  def inspect
    "<Planet: #{name}>"
  end

  def exist?
    %w[Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune].include?(name)
  end
end

describe "Earth" do
  subject { Planet.new("Earth") }
  it { should exist }
  it { should_not exist } # deliberate failure
end

describe "Tatooine" do
  subject { Planet.new("Tatooine") }
  it { should_not exist }
  it { should exist } # deliberate failure
end

When

I run "rspec exist_matcher_spec.rb"

Then

the output should contain all of these:

4 examples, 2 failures

expected <Planet: Earth> not to exist

expected <Planet: Tatooine> to exist

Last published over 7 years ago by .

exist matcher

RSpec Expectations settings