spec/ruby/library/bigdecimal/mode_spec.rb


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require_relative '../../spec_helper'

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

  describe "BigDecimal.mode" do
    #the default value of BigDecimal exception constants is false
    after :each do
      BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false)
      BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
      BigDecimal.mode(BigDecimal::EXCEPTION_UNDERFLOW, false)
      BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false)
      BigDecimal.mode(BigDecimal::EXCEPTION_ZERODIVIDE, false)
    end

    it "returns the appropriate value and continue the computation if the flag is false" do
      BigDecimal("NaN").add(BigDecimal("1"),0).should.nan?
      BigDecimal("0").add(BigDecimal("Infinity"),0).should == BigDecimal("Infinity")
      BigDecimal("1").quo(BigDecimal("0")).should == BigDecimal("Infinity")
    end

    it "returns Infinity when too big" do
      BigDecimal("1E11111111111111111111").should == BigDecimal("Infinity")
      (BigDecimal("1E1000000000000000000")**10).should == BigDecimal("Infinity")
    end

    it "raise an exception if the flag is true" do
      BigDecimal.mode(BigDecimal::EXCEPTION_NaN, true)
      -> { BigDecimal("NaN").add(BigDecimal("1"),0) }.should raise_error(FloatDomainError)
      BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, true)
      -> { BigDecimal("0").add(BigDecimal("Infinity"),0) }.should raise_error(FloatDomainError)
      BigDecimal.mode(BigDecimal::EXCEPTION_ZERODIVIDE, true)
      -> { BigDecimal("1").quo(BigDecimal("0")) }.should raise_error(FloatDomainError)
      BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, true)
      -> { BigDecimal("1E11111111111111111111") }.should raise_error(FloatDomainError)
      -> { (BigDecimal("1E1000000000000000000")**10) }.should raise_error(FloatDomainError)
    end
  end
end