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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "IO#printf" do
before :each do
@name = tmp("io_printf.txt")
@io = new_io @name
@io.sync = true
end
after :each do
@io.close if @io
rm_r @name
end
it "calls #to_str to convert the format object to a String" do
obj = mock("printf format")
obj.should_receive(:to_str).and_return("%s")
@io.printf obj, "printf"
File.read(@name).should == "printf"
end
it "writes the #sprintf formatted string" do
@io.printf "%d %s", 5, "cookies"
File.read(@name).should == "5 cookies"
end
it "raises IOError on closed stream" do
-> { IOSpecs.closed_io.printf("stuff") }.should raise_error(IOError)
end
end
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