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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "String#dup" do
before :each do
ScratchPad.clear
@obj = StringSpecs::InitializeString.new "string"
end
it "calls #initialize_copy on the new instance" do
dup = @obj.dup
ScratchPad.recorded.should_not == @obj.object_id
ScratchPad.recorded.should == dup.object_id
end
it "copies instance variables" do
dup = @obj.dup
dup.ivar.should == 1
end
it "does not copy singleton methods" do
def @obj.special() :the_one end
dup = @obj.dup
-> { dup.special }.should raise_error(NameError)
end
it "does not copy modules included in the singleton class" do
class << @obj
include StringSpecs::StringModule
end
dup = @obj.dup
-> { dup.repr }.should raise_error(NameError)
end
it "does not copy constants defined in the singleton class" do
class << @obj
CLONE = :clone
end
dup = @obj.dup
-> { class << dup; CLONE; end }.should raise_error(NameError)
end
it "does not modify the original string when changing dupped string" do
orig = "string"[0..100]
dup = orig.dup
orig[0] = 'x'
orig.should == "xtring"
dup.should == "string"
end
it "does not modify the original setbyte-mutated string when changing dupped string" do
orig = "a"
orig.setbyte 0, "b".ord
copy = orig.dup
orig.setbyte 0, "c".ord
orig.should == "c"
copy.should == "b"
end
it "returns a String in the same encoding as self" do
"hello".encode("US-ASCII").dup.encoding.should == Encoding::US_ASCII
end
end
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