require File.expand_path('../../../spec_helper', __FILE__) require File.expand_path('../../kernel/shared/sprintf', __FILE__) describe "File#printf" do it_behaves_like :kernel_sprintf, -> (format, *args) { begin @filename = tmp("printf.txt") File.open(@filename, "w", encoding: "utf-8") do |f| f.printf(format, *args) end File.read(@filename, encoding: "utf-8") ensure rm_r @filename end } end