mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
9dc121cc57
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63768 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
54 lines
1.6 KiB
Ruby
54 lines
1.6 KiB
Ruby
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
|