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#!/usr/bin/env ruby
require File.expand_path(File.join(File.dirname(__FILE__), "test_helper"))
# A mock data object with customizable fields.
class MockBinDataObject
def initialize(methods = {}, params = {}, parent = nil)
meta = class << self ; self; end
methods.each do |k,v|
meta.send(:define_method, k.to_sym) { v }
end
@parameters = params
@parent = parent
end
attr_accessor :parent
def has_parameter?(key)
@parameters.has_key?(key)
end
def get_parameter(key)
@parameters[key]
end
def lazy_evaluator
BinData::LazyEvaluator.new(self)
end
alias_method :safe_respond_to?, :respond_to?
end
def lazy_eval(*rest)
subject.lazy_evaluator.lazy_eval(*rest)
end
describe BinData::LazyEvaluator, "with no parents" do
subject {
methods = {m1: 'm1', com: 'mC'}
params = {p1: 'p1', com: 'pC'}
MockBinDataObject.new(methods, params)
}
it "evaluates raw value when instantiated" do
_(lazy_eval(5)).must_equal 5
end
it "evaluates raw value" do
_(lazy_eval(5)).must_equal 5
end
it "evaluates value" do
_(lazy_eval(lambda { 5 })).must_equal 5
end
it "evaluates overrides" do
_(lazy_eval(lambda { o1 }, o1: 'o1')).must_equal 'o1'
end
it "does not resolve any unknown methods" do
_ { lazy_eval(lambda { unknown }) }.must_raise NameError
_ { lazy_eval(lambda { m1 }) }.must_raise NameError
_ { lazy_eval(lambda { p1 }) }.must_raise NameError
end
it "does not have a parent" do
_(lazy_eval(lambda { parent })).must_be_nil
end
it "does not resolve #index" do
_ { lazy_eval(lambda { index }) }.must_raise NoMethodError
end
end
describe BinData::LazyEvaluator, "with one parent" do
subject {
parent_methods = {m1: 'Pm1', m2: 'Pm2', com1: 'PmC', mm: 3}
parent_params = {p1: 'Pp1', com1: 'PpC'}
parent_obj = MockBinDataObject.new(parent_methods, parent_params)
class << parent_obj
def echo(a1, a2)
[a1, a2]
end
private :m2
end
methods = {m1: 'm1', com1: 'mC'}
params = {p1: 'p1', com1: 'pC'}
MockBinDataObject.new(methods, params, parent_obj)
}
it "evaluates raw value" do
_(lazy_eval(5)).must_equal 5
end
it "evaluates value" do
_(lazy_eval(lambda { 5 })).must_equal 5
end
it "evaluates overrides before params" do
_(lazy_eval(lambda { p1 }, p1: 'o1')).must_equal 'o1'
end
it "evaluates overrides before methods" do
_(lazy_eval(lambda { m1 }, m1: 'o1')).must_equal 'o1'
end
it "does not resolve any unknown methods" do
_ { lazy_eval(lambda { unknown }) }.must_raise NoMethodError
end
it "resolves parameters in the parent" do
_(lazy_eval(lambda { p1 })).must_equal 'Pp1'
end
it "resolves methods in the parent" do
_(lazy_eval(lambda { m1 })).must_equal 'Pm1'
end
it "invokes methods in the parent" do
_(lazy_eval(lambda { echo(p1, m1) })).must_equal ['Pp1', 'Pm1']
end
it "invokes private methods in the parent" do
_(lazy_eval(lambda { m2 })).must_equal 'Pm2'
end
it "resolves parameters in preference to methods in the parent" do
_(lazy_eval(lambda { com1 })).must_equal 'PpC'
end
it "has a parent" do
_(lazy_eval(lambda { parent })).wont_be_nil
end
it "does not resolve #index" do
_ { lazy_eval(lambda { index }) }.must_raise NoMethodError
end
end
describe BinData::LazyEvaluator, "with nested parents" do
subject {
pparent_methods = {m1: 'PPm1', m2: 'PPm2', com1: 'PPmC'}
pparent_params = {p1: 'PPp1', p2: 'PPp2', com1: 'PPpC'}
pparent_obj = MockBinDataObject.new(pparent_methods, pparent_params)
def pparent_obj.echo(arg)
["PP", arg]
end
def pparent_obj.echo2(arg)
["PP2", arg]
end
parent_methods = {m1: 'Pm1', com1: 'PmC', sym1: :m2, sym2: -> { m2 }}
parent_params = {p1: 'Pp1', com1: 'PpC'}
parent_obj = MockBinDataObject.new(parent_methods, parent_params, pparent_obj)
def parent_obj.echo(arg)
["P", arg]
end
methods = {m1: 'm1', com1: 'mC'}
params = {p1: 'p1', com1: 'pC'}
MockBinDataObject.new(methods, params, parent_obj)
}
it "accepts symbols as a shortcut to lambdas" do
_(lazy_eval(:p1)).must_equal 'Pp1'
_(lazy_eval(:p2)).must_equal 'PPp2'
_(lazy_eval(:m1)).must_equal 'Pm1'
_(lazy_eval(:m2)).must_equal 'PPm2'
end
it "does not resolve any unknown methods" do
_ { lazy_eval(lambda { unknown }) }.must_raise NoMethodError
end
it "resolves parameters in the parent" do
_(lazy_eval(lambda { p1 })).must_equal 'Pp1'
end
it "resolves methods in the parent" do
_(lazy_eval(lambda { m1 })).must_equal 'Pm1'
end
it "resolves parameters in the parent's parent" do
_(lazy_eval(lambda { p2 })).must_equal 'PPp2'
end
it "resolves methods in the parent's parent" do
_(lazy_eval(lambda { m2 })).must_equal 'PPm2'
end
it "invokes methods in the parent" do
_(lazy_eval(lambda { echo(m1) })).must_equal ['P', 'Pm1']
end
it "invokes methods in the parent's parent" do
_(lazy_eval(lambda { parent.echo(m1) }, { m1: 'o1'})).must_equal ['PP', 'o1']
end
it "invokes methods in the parent's parent" do
_(lazy_eval(lambda { echo2(m1) })).must_equal ['PP2', 'Pm1']
end
it "resolves parameters in preference to methods in the parent" do
_(lazy_eval(lambda { com1 })).must_equal 'PpC'
end
it "resolves methods in the parent explicitly" do
_(lazy_eval(lambda { parent.m1 })).must_equal 'PPm1'
end
it "cascades lambdas " do
_(lazy_eval(lambda { sym1 })).must_equal 'PPm2'
_(lazy_eval(lambda { sym2 })).must_equal 'PPm2'
end
it "does not resolve #index" do
_ { lazy_eval(lambda { index }) }.must_raise NoMethodError
end
end
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