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require File.expand_path('../../../spec_helper', __FILE__)
require 'bigdecimal'
describe "BigDecimal#-@" do
before(:each) do
@one = BigDecimal("1")
@zero = BigDecimal("0")
@zero_pos = BigDecimal("+0")
@zero_neg = BigDecimal("-0")
@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")
@big = BigDecimal("333E99999")
@big_neg = BigDecimal("-333E99999")
@values = [@one, @zero, @zero_pos, @zero_neg, @infinity,
@infinity_minus, @one_minus, @frac_1, @frac_2, @big, @big_neg]
end
it "negates self" do
@one.send(:-@).should == @one_minus
@one_minus.send(:-@).should == @one
@frac_1.send(:-@).should == BigDecimal("-1E-99999")
@frac_2.send(:-@).should == BigDecimal("-0.9E-99999")
@big.send(:-@).should == @big_neg
@big_neg.send(:-@).should == @big
BigDecimal("2.221").send(:-@).should == BigDecimal("-2.221")
BigDecimal("2E10000").send(:-@).should == BigDecimal("-2E10000")
some_number = BigDecimal("2455999221.5512")
some_number_neg = BigDecimal("-2455999221.5512")
some_number.send(:-@).should == some_number_neg
(-BigDecimal("-5.5")).should == BigDecimal("5.5")
another_number = BigDecimal("-8.551551551551551551")
another_number_pos = BigDecimal("8.551551551551551551")
another_number.send(:-@).should == another_number_pos
@values.each do |val|
(val.send(:-@).send(:-@)).should == val
end
end
it "properly handles special values" do
@infinity.send(:-@).should == @infinity_minus
@infinity_minus.send(:-@).should == @infinity
@infinity.send(:-@).infinite?.should == -1
@infinity_minus.send(:-@).infinite?.should == 1
@zero.send(:-@).should == @zero
@zero.send(:-@).sign.should == -1
@zero_pos.send(:-@).should == @zero
@zero_pos.send(:-@).sign.should == -1
@zero_neg.send(:-@).should == @zero
@zero_neg.send(:-@).sign.should == 1
@nan.send(:-@).nan?.should == true
end
end
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