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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/sprintf'
describe "Kernel#printf" do
it "is a private method" do
Kernel.should have_private_instance_method(:printf)
end
end
describe "Kernel.printf" do
before :each do
@stdout = $stdout
@name = tmp("kernel_puts.txt")
$stdout = new_io @name
end
after :each do
$stdout.close
$stdout = @stdout
rm_r @name
end
it "writes to stdout when a string is the first argument" do
$stdout.should_receive(:write).with("string")
Kernel.printf("%s", "string")
end
it "calls write on the first argument when it is not a string" do
object = mock('io')
object.should_receive(:write).with("string")
Kernel.printf(object, "%s", "string")
end
it "calls #to_str to convert the format object to a String" do
object = mock('format string')
object.should_receive(:to_str).and_return("to_str: %i")
$stdout.should_receive(:write).with("to_str: 42")
Kernel.printf($stdout, object, 42)
end
end
describe "Kernel.printf" do
describe "formatting" do
before :each do
require "stringio"
end
context "io is specified" do
it_behaves_like :kernel_sprintf, -> format, *args {
io = StringIO.new(+"")
Kernel.printf(io, format, *args)
io.string
}
end
context "io is not specified" do
it_behaves_like :kernel_sprintf, -> format, *args {
stdout = $stdout
begin
$stdout = io = StringIO.new(+"")
Kernel.printf(format, *args)
io.string
ensure
$stdout = stdout
end
}
end
end
end
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