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require File.expand_path('../../../spec_helper', __FILE__)
require 'bigdecimal'
describe "BigDecimal#<=>" do
before :each do
@zero = BigDecimal("0")
@zero_pos = BigDecimal("+0")
@zero_neg = BigDecimal("-0")
@mixed = BigDecimal("1.23456789")
@mixed_big = BigDecimal("1.23456789E100")
@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 0 if a == b" do
(@pos_int <=> @pos_int).should == 0
(@neg_int <=> @neg_int).should == 0
(@pos_frac <=> @pos_frac).should == 0
(@neg_frac <=> @neg_frac).should == 0
(@zero <=> @zero).should == 0
(@infinity <=> @infinity).should == 0
(@infinity_neg <=> @infinity_neg).should == 0
end
it "returns 1 if a > b" do
(@pos_int <=> @neg_int).should == 1
(@pos_frac <=> @neg_frac).should == 1
(@pos_frac <=> @zero).should == 1
@values.each { |val|
(@infinity <=> val).should == 1
}
end
it "returns -1 if a < b" do
(@zero <=> @pos_frac).should == -1
(@neg_int <=> @pos_frac).should == -1
(@pos_frac <=> @pos_int).should == -1
@values.each { |val|
(@infinity_neg <=> val).should == -1
}
end
it "returns nil if NaN is involved" do
@values += [@infinity, @infinity_neg, @nan]
@values << nil
@values << Object.new
@values.each { |val|
(@nan <=> val).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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