ruby--ruby/spec/ruby/library/bigdecimal/precs_spec.rb

require_relative '../../spec_helper'
require 'bigdecimal'

describe "BigDecimal#precs" do
  before :each do
    @infinity = BigDecimal("Infinity")
    @infinity_neg = BigDecimal("-Infinity")
    @nan = BigDecimal("NaN")
    @zero = BigDecimal("0")
    @zero_neg = BigDecimal("-0")

    @arr = [BigDecimal("2E40001"), BigDecimal("3E-20001"),\
            @infinity, @infinity_neg, @nan, @zero, @zero_neg]
    @precision = BigDecimal::BASE.to_s.length - 1
  end

  it "returns array of two values" do
    suppress_warning do
      @arr.each do |x|
        x.precs.kind_of?(Array).should == true
        x.precs.size.should == 2
      end
    end
  end

  it "returns Integers as array values" do
    suppress_warning do
      @arr.each do |x|
        x.precs[0].kind_of?(Integer).should == true
        x.precs[1].kind_of?(Integer).should == true
      end
    end
  end

  it "returns the current value of significant digits as the first value" do
    suppress_warning do
      BigDecimal("3.14159").precs[0].should >= 6
      BigDecimal('1').precs[0].should == BigDecimal('1' + '0' * 100).precs[0]
      [@infinity, @infinity_neg, @nan, @zero, @zero_neg].each do |value|
        value.precs[0].should <= @precision
      end
    end
  end

  it "returns the maximum number of significant digits as the second value" do
    suppress_warning do
      BigDecimal("3.14159").precs[1].should >= 6
      BigDecimal('1').precs[1].should >= 1
      BigDecimal('1' + '0' * 100).precs[1].should >= 101
      [@infinity, @infinity_neg, @nan, @zero, @zero_neg].each do |value|
        value.precs[1].should >= 1
      end
    end
  end
end