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require File.dirname(__FILE__) + '/../../spec_helper'
require 'bigdecimal'
describe "BigDecimal#<" do
before(:each) do
@zero = BigDecimal("0")
@zero_pos = BigDecimal("+0")
@zero_neg = BigDecimal("-0")
@mixed = BigDecimal("1.23456789")
@pos_int = BigDecimal("2E5555")
@neg_int = BigDecimal("-2E5555")
@pos_frac = BigDecimal("2E-9999")
@neg_frac = BigDecimal("-2E-9999")
@int_mock = mock('123')
class << @int_mock
def coerce(other)
return [other, BigDecimal('123')]
end
def < (other)
BigDecimal('123') < other
end
end
@values = [@mixed, @pos_int, @neg_int, @pos_frac, @neg_frac,
-2**32, -2**31, -2**30, -2**16, -2**8, -100, -10, -1,
@zero , 1, 2, 10, 2**8, 2**16, 2**32, @int_mock, @zero_pos, @zero_neg]
@infinity = BigDecimal("Infinity")
@infinity_neg = BigDecimal("-Infinity")
@nan = BigDecimal("NaN")
end
it "returns true if a < b" do
one = BigDecimal("1")
two = BigDecimal("2")
frac_1 = BigDecimal("1E-99999")
frac_2 = BigDecimal("0.9E-99999")
(@zero < one).should == true
(two < @zero).should == false
(frac_2 < frac_1).should == true
(@neg_int < @pos_int).should == true
(@pos_int < @neg_int).should == false
(@neg_int < @pos_frac).should == true
(@pos_frac < @neg_int).should == false
(@zero < @zero_pos).should == false
(@zero < @zero_neg).should == false
(@zero_neg < @zero_pos).should == false
(@zero_pos < @zero_neg).should == false
end
it "properly handles infinity values" do
@values.each { |val|
(val < @infinity).should == true
(@infinity < val).should == false
(val < @infinity_neg).should == false
(@infinity_neg < val).should == true
}
(@infinity < @infinity).should == false
(@infinity_neg < @infinity_neg).should == false
(@infinity < @infinity_neg).should == false
(@infinity_neg < @infinity).should == true
end
it "properly handles NaN values" do
@values += [@infinity, @infinity_neg, @nan]
@values << nil
@values << Object.new
@values.each { |val|
(@nan < val).should == nil
}
lambda { 10 < @nan }.should raise_error(ArgumentError)
(10.5 < @nan).should == false
(@infinity < @nan).should == nil
(@infinity_neg < @nan).should == nil
(@zero < @nan).should == nil
end
it "returns nil if the argument is nil" do
(@zero < nil).should == nil
(@infinity < nil).should == nil
(@infinity_neg < nil).should == nil
(@mixed < nil).should == nil
(@pos_int < nil).should == nil
(@neg_frac < nil).should == nil
end
end
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