require File.expand_path('../../../spec_helper', __FILE__)

describe "Bignum#to_s when given a base" do
  it "returns self converted to a String using the given base" do
    a = 2**64
    a.to_s(2).should == "10000000000000000000000000000000000000000000000000000000000000000"
    a.to_s(8).should == "2000000000000000000000"
    a.to_s(16).should == "10000000000000000"
    a.to_s(32).should == "g000000000000"
  end

  it "raises an ArgumentError if the base is less than 2 or higher than 36" do
    lambda { 123.to_s(-1) }.should raise_error(ArgumentError)
    lambda { 123.to_s(0) }.should raise_error(ArgumentError)
    lambda { 123.to_s(1) }.should raise_error(ArgumentError)
    lambda { 123.to_s(37) }.should raise_error(ArgumentError)
  end
end

describe "Bignum#to_s when given no base" do
  it "returns self converted to a String using base 10" do
    bignum_value(9).to_s.should == "9223372036854775817"
    bignum_value.to_s.should == "9223372036854775808"
    (-bignum_value(675)).to_s.should == "-9223372036854776483"
  end
end

with_feature :encoding do
  describe "Bignum#to_s" do
    before :each do
      @internal = Encoding.default_internal
    end

    after :each do
      Encoding.default_internal = @internal
    end

    it "returns a String in US-ASCII encoding when Encoding.default_internal is nil" do
      Encoding.default_internal = nil
      bignum_value.to_s.encoding.should equal(Encoding::US_ASCII)
    end

    it "returns a String in US-ASCII encoding when Encoding.default_internal is not nil" do
      Encoding.default_internal = Encoding::IBM437
      bignum_value.to_s.encoding.should equal(Encoding::US_ASCII)
    end
  end
end