Ruby で Groovy の Spock ぽい spec を書きたいという遊び。assert を書かないと powe...

class Foo extend Ruby::Spock

spec 'maximum of two numbers', ->(*) { expect { assert { [a, b].max == c } } where [ [ :a, :b, :c ], [ 1, 3, 3 ], #=> . [ 7, 4, 4 ], #=> F [ 0, 0, 0 ], #=> . ] }

spec 'minimum of two numbers' do expect { [a, b].min == c } where [ [ :a, :b, :c ], [ 1, 3, 1 ], #=> . [ 7, 4, 4 ], #=> . [ 0, 0, 1 ], #=> F ] end end

require 'power_assert'

module Ruby module Spock def spec(description, definition = nil, &proc_definition) raise ArgumentError if [ definition, proc_definition ].all? {|d| d.nil? } if definition.nil? spec_runner(description, proc_definition) else spec_runner(description, definition) end end

private def spec_runner(description, definition) s = Specification.new d = Definition.new(s) d.instance_eval(&definition)

puts description columns, *examples = s.examples examples.each do |args| context = Struct.new(*columns).new(*args) context.extend(Assertions) if context.instance_eval(&s.expectation) print '.' else print 'F' end end print "\n" end

class Specification attr_accessor :expectation, :examples end

module Assertions def assert(&blk) ::PowerAssert.start(blk, assertion_method: __method__) do |pa| result = pa.yield message = pa.message_proc.() puts message unless result result end end end class Definition attr_reader :spec def initialize(specification) @spec = specification end

def expect(&expectation) spec.expectation = expectation end

def where(examples) spec.examples = examples end end end end

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