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require_relative '../../spec_helper'
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.nan?.should == true
@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
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