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