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Contents
require File.expand_path('../../../spec_helper', __FILE__)
require 'hamster/immutable'
describe Hamster::Immutable do
describe "#transform_unless" do
class Person < Struct.new(:first, :last)
include Hamster::Immutable
public :transform_unless
end
before do
@original = Person.new("Simon", "Harris")
end
describe "when the condition is false" do
before do
@result = @original.transform_unless(false) { self.first = "Sampy" }
end
it "preserves the original" do
@original.first.should == "Simon"
@original.last.should == "Harris"
end
it "returns a new instance with the updated values" do
@result.first.should == "Sampy"
@result.last.should == "Harris"
end
end
describe "when the condition is true" do
before do
@result = @original.transform_unless(true) { fail("Should never be called") }
end
it "preserves the original" do
@original.first.should == "Simon"
@original.last.should == "Harris"
end
it "returns the original" do
@result.should equal(@original)
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems