Sha256: 7849abec2b408d4399b8e9dc32018173bb672640c7b3218c9fcf542c89ca237b
Contents?: true
Size: 1.75 KB
Versions: 70
Compression:
Stored size: 1.75 KB
Contents
require "insist/namespace"
require "insist/assert"
require "insist/comparators"
require "insist/enumerables"
require "insist/failure"
require "insist/nil"
require "insist/predicates"
require "insist/raises"
# Insist on correctness.
#
#
# Example:
#
# data = { "hello" => "world" }
# insist { data["hello"] } == "world"
#
# This class aims to work similarly to how rspec's "should" stuff does, but
# instead of molesting Object allows you to neatly wrap values with blocks
# while still checking for expected values.
class Insist
class Failure < StandardError; end
include Insist::Comparators
include Insist::Enumerables
include Insist::Nil
include Insist::Assert
include Insist::Raises
include Insist::Predicates
# Create a new insist with a block.
#
# Example:
#
# Insist.new { value }
#
# Better:
#
# insist { value }
def initialize(&block)
@callback = block
end # def initialize
def value
# TODO(sissel): make caching the value optional
@value ||= @callback.call
return @value
end # def value
end # class Insist
# Like Insist, but rejects (fails) on truthy values instead falsey ones.
class Reject < Insist
def assert(truthy, message)
raise Insist::Failure.new(message) if truthy
end # def assert
end # class Reject
module Kernel
# A shortcut to 'Insist.new'
#
# Example:
#
# insist { "hello world" } != "fizzle"
def insist(&block)
return Insist.new(&block)
end # def insist
# A shortcut to 'Reject.new'
#
# Example:
#
# # This will fail (raises Insist::Failure)
# reject { [1,2,3,4] }.include?(3)
#
# # This will succeed
# reject { [1,2,3,4] }.include?(4)
def reject(&block)
return Reject.new(&block)
end # def reject
end # module Kernel
Version data entries
70 entries across 66 versions & 18 rubygems