require_relative '../../spec_helper'

ruby_version_is ""..."3.4" do
  require 'bigdecimal'

  describe "BigDecimal#to_f" do
    before :each do
      @one = BigDecimal("1")
      @zero = BigDecimal("0")
      @zero_pos = BigDecimal("+0")
      @zero_neg = BigDecimal("-0")
      @two = BigDecimal("2")
      @three = BigDecimal("3")
      @nan = BigDecimal("NaN")
      @infinity = BigDecimal("Infinity")
      @infinity_minus = BigDecimal("-Infinity")
      @one_minus = BigDecimal("-1")
      @frac_1 = BigDecimal("1E-99999")
      @frac_2 = BigDecimal("0.9E-99999")
      @vals = [@one, @zero, @two, @three, @frac_1, @frac_2]
      @spec_vals = [@zero_pos, @zero_neg, @nan, @infinity, @infinity_minus]
    end

    it "returns number of type float" do
      BigDecimal("3.14159").to_f.should be_kind_of(Float)
      @vals.each { |val| val.to_f.should be_kind_of(Float) }
      @spec_vals.each { |val| val.to_f.should be_kind_of(Float) }
    end

    it "rounds correctly to Float precision" do
      bigdec = BigDecimal("3.141592653589793238462643383279502884197169399375")
      bigdec.to_f.should be_close(3.14159265358979, TOLERANCE)
      @one.to_f.should == 1.0
      @two.to_f.should == 2.0
      @three.to_f.should be_close(3.0, TOLERANCE)
      @one_minus.to_f.should == -1.0

      # regression test for [ruby-talk:338957]
      BigDecimal("10.03").to_f.should == 10.03
    end

    it "properly handles special values" do
      @zero.to_f.should == 0
      @zero.to_f.to_s.should == "0.0"

      @nan.to_f.should.nan?

      @infinity.to_f.infinite?.should == 1
      @infinity_minus.to_f.infinite?.should == -1
    end

    it "remembers negative zero when converted to float" do
      @zero_neg.to_f.should == 0
      @zero_neg.to_f.to_s.should == "-0.0"
    end
  end
end
