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require File.expand_path('../../../spec_helper', __FILE__)
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).nan?.should == true
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)
lambda { BigDecimal("NaN").add(BigDecimal("1"),0) }.should raise_error(FloatDomainError)
BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, true)
lambda { BigDecimal("0").add(BigDecimal("Infinity"),0) }.should raise_error(FloatDomainError)
BigDecimal.mode(BigDecimal::EXCEPTION_ZERODIVIDE, true)
lambda { BigDecimal("1").quo(BigDecimal("0")) }.should raise_error(FloatDomainError)
BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, true)
lambda { BigDecimal("1E11111111111111111111") }.should raise_error(FloatDomainError)
lambda { (BigDecimal("1E1000000000000000000")**10) }.should raise_error(FloatDomainError)
end
end
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