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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative '../../core/kernel/shared/sprintf'
describe "StringIO#printf" do
before :each do
@io = StringIO.new('example')
end
it "returns nil" do
@io.printf("%d %04x", 123, 123).should be_nil
end
it "pads self with \\000 when the current position is after the end" do
@io.pos = 10
@io.printf("%d", 123)
@io.string.should == "example\000\000\000123"
end
it "performs format conversion" do
@io.printf("%d %04x", 123, 123)
@io.string.should == "123 007b"
end
it "updates the current position" do
@io.printf("%d %04x", 123, 123)
@io.pos.should eql(8)
@io.printf("%d %04x", 123, 123)
@io.pos.should eql(16)
end
describe "formatting" do
it_behaves_like :kernel_sprintf, -> format, *args {
io = StringIO.new(+"")
io.printf(format, *args)
io.string
}
end
end
describe "StringIO#printf when in append mode" do
before :each do
@io = StringIO.new("example", "a")
end
it "appends the passed argument to the end of self" do
@io.printf("%d %04x", 123, 123)
@io.string.should == "example123 007b"
@io.printf("%d %04x", 123, 123)
@io.string.should == "example123 007b123 007b"
end
it "correctly updates self's position" do
@io.printf("%d %04x", 123, 123)
@io.pos.should eql(15)
end
end
describe "StringIO#printf when self is not writable" do
it "raises an IOError" do
io = StringIO.new("test", "r")
-> { io.printf("test") }.should raise_error(IOError)
io = StringIO.new("test")
io.close_write
-> { io.printf("test") }.should raise_error(IOError)
end
end
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