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path: root/spec/ruby/library/bigdecimal/limit_spec.rb
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require_relative '../../spec_helper'

ruby_version_is ""..."3.4" do
  require_relative 'fixtures/classes'
  require 'bigdecimal'

  describe "BigDecimal.limit" do
    it "returns the value before set if the passed argument is nil or is not specified" do
      old = BigDecimal.limit
      BigDecimal.limit.should == 0
      BigDecimal.limit(10).should == 0
      BigDecimal.limit.should == 10
      BigDecimal.limit(old)
    end

    it "uses the global limit if no precision is specified" do
      BigDecimalSpecs.with_limit(0) do
        (BigDecimal('0.888') + BigDecimal('0')).should == BigDecimal('0.888')
        (BigDecimal('0.888') - BigDecimal('0')).should == BigDecimal('0.888')
        (BigDecimal('0.888') * BigDecimal('3')).should == BigDecimal('2.664')
        (BigDecimal('0.888') / BigDecimal('3')).should == BigDecimal('0.296')
      end

      BigDecimalSpecs.with_limit(1) do
        (BigDecimal('0.888') + BigDecimal('0')).should == BigDecimal('0.9')
        (BigDecimal('0.888') - BigDecimal('0')).should == BigDecimal('0.9')
        (BigDecimal('0.888') * BigDecimal('3')).should == BigDecimal('3')
        (BigDecimal('0.888') / BigDecimal('3')).should == BigDecimal('0.3')
      end

      BigDecimalSpecs.with_limit(2) do
        (BigDecimal('0.888') + BigDecimal('0')).should == BigDecimal('0.89')
        (BigDecimal('0.888') - BigDecimal('0')).should == BigDecimal('0.89')
        (BigDecimal('0.888') * BigDecimal('3')).should == BigDecimal('2.7')
        (BigDecimal('0.888') / BigDecimal('3')).should == BigDecimal('0.30')
      end
    end

    it "picks the specified precision over global limit" do
      BigDecimalSpecs.with_limit(3) do
        BigDecimal('0.888').add(BigDecimal('0'), 2).should == BigDecimal('0.89')
        BigDecimal('0.888').sub(BigDecimal('0'), 2).should == BigDecimal('0.89')
        BigDecimal('0.888').mult(BigDecimal('3'), 2).should == BigDecimal('2.7')
        BigDecimal('0.888').div(BigDecimal('3'), 2).should == BigDecimal('0.30')
      end
    end

    it "picks the global precision when limit 0 specified" do
      BigDecimalSpecs.with_limit(3) do
        BigDecimal('0.8888').add(BigDecimal('0'), 0).should == BigDecimal('0.889')
        BigDecimal('0.8888').sub(BigDecimal('0'), 0).should == BigDecimal('0.889')
        BigDecimal('0.888').mult(BigDecimal('3'), 0).should == BigDecimal('2.66')
        BigDecimal('0.8888').div(BigDecimal('3'), 0).should == BigDecimal('0.296')
      end
    end

  end
end