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require File.dirname(__FILE__) + '/../../spec_helper'
require 'bigdecimal'
describe "BigDecimal#infinite?" do
it "returns 1 if self is Infinity" do
# documentation says returns true.
BigDecimal("Infinity").infinite?.should == 1
end
it "returns -1 if self is -Infinity" do
# This is how MRI behaves.
BigDecimal("-Infinity").infinite?.should == -1
end
it "returns not true otherwise" do
# If nil or false is not really specified in documentation.
e2_plus = BigDecimal("2E40001")
e3_minus = BigDecimal("3E-20001")
really_small_zero = BigDecimal("0E-200000000")
really_big_zero = BigDecimal("0E200000000000")
e3_minus.infinite?.should == nil
e2_plus.infinite?.should == nil
really_small_zero.infinite?.should == nil
really_big_zero.infinite?.should == nil
BigDecimal("0.000000000000000000000000").infinite?.should == nil
end
it "returns not true if self is NaN" do
# NaN is a special value which is neither finite nor infinite.
nan = BigDecimal("NaN")
nan.infinite?.should == nil
end
end
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