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require File.expand_path('../../../spec_helper', __FILE__)
require 'stringio'
describe "StringIO#initialize_copy" do
before(:each) do
@io = StringIO.new("StringIO example")
@orig_io = StringIO.new("Original StringIO")
end
it "is private" do
StringIO.should have_private_instance_method(:initialize_copy)
end
it "returns self" do
@io.send(:initialize_copy, @orig_io).should equal(@io)
end
it "tries to convert the passed argument to a StringIO using #to_strio" do
obj = mock('to_strio')
obj.should_receive(:to_strio).and_return(StringIO.new("converted"))
@io.send(:initialize_copy, obj)
@io.string.should == "converted"
end
it "copies the passed StringIO's content to self" do
@io.send(:initialize_copy, @orig_io)
@io.string.should == "Original StringIO"
end
it "copies the passed StringIO's position to self" do
@orig_io.pos = 5
@io.send(:initialize_copy, @orig_io)
@io.pos.should eql(5)
end
it "taints self when the passed StringIO is tainted" do
@orig_io.taint
@io.send(:initialize_copy, @orig_io)
@io.tainted?.should be_true
end
it "copies the passed StringIO's mode to self" do
orig_io = StringIO.new("read-only", "r")
@io.send(:initialize_copy, orig_io)
@io.closed_read?.should be_false
@io.closed_write?.should be_true
orig_io = StringIO.new("write-only", "w")
@io.send(:initialize_copy, orig_io)
@io.closed_read?.should be_true
@io.closed_write?.should be_false
orig_io = StringIO.new("read-write", "r+")
@io.send(:initialize_copy, orig_io)
@io.closed_read?.should be_false
@io.closed_write?.should be_false
orig_io = StringIO.new("read-write", "w+")
@io.send(:initialize_copy, orig_io)
@io.closed_read?.should be_false
@io.closed_write?.should be_false
end
it "copies the passed StringIO's append mode" do
orig_io = StringIO.new("read-write", "a")
@io.send(:initialize_copy, orig_io)
@io.pos = 0
@io << " test"
@io.string.should == "read-write test"
end
it "does not truncate self's content when the copied StringIO was in truncate mode" do
orig_io = StringIO.new("original StringIO", "w+")
orig_io.write("not truncated") # make sure the content is not empty
@io.send(:initialize_copy, orig_io)
@io.string.should == "not truncated"
end
it "makes both StringIO objects to share position, eof status" do
@io.send(:initialize_copy, @orig_io)
@orig_io.pos.should == 0
@io.getc
@io.pos.should == 1
@orig_io.pos.should == 1
@orig_io.read(1).should == "r"
@io.read(1).should == "i"
@orig_io.pos.should == 3
@orig_io.pos.should == 3
@io.gets(nil)
@io.eof?.should == true
@orig_io.eof?.should == true
end
end
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