class RSpec::Matchers::BuiltIn::Exist

Public Class Methods

new(*expected) click to toggle source
# File lib/rspec/matchers/built_in/exist.rb, line 5
def initialize(*expected)
  @expected = expected
end

Public Instance Methods

matches?(actual) click to toggle source
# File lib/rspec/matchers/built_in/exist.rb, line 9
def matches?(actual)
  @actual = actual
  predicates = [:exist?, :exists?].select { |p| @actual.respond_to?(p) }
  existence_values = predicates.map { |p| @actual.__send__(p, *@expected) }
  uniq_truthy_values = existence_values.map { |v| !!v }.uniq

  case uniq_truthy_values.size
  when 0; raise NoMethodError.new("#{@actual.inspect} does not respond to either #exist? or #exists?")
  when 1; existence_values.first
  else raise "#exist? and #exists? returned different values:\n\n" +
    " exist?: #{existence_values.first}\n" +
    "exists?: #{existence_values.last}"
  end
end