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require File.expand_path('../../../spec_helper', __FILE__)
require 'bigdecimal'
describe "BigDecimal#remainder" do
before(:each) do
@zero = BigDecimal("0")
@one = BigDecimal("0")
@mixed = BigDecimal("1.23456789")
@pos_int = BigDecimal("2E5555")
@neg_int = BigDecimal("-2E5555")
@pos_frac = BigDecimal("2E-9999")
@neg_frac = BigDecimal("-2E-9999")
@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")
end
it "it equals modulo, if both values are of same sign" do
BigDecimal('1234567890123456789012345679').remainder(BigDecimal('1')).should == @zero
BigDecimal('123456789').remainder(BigDecimal('333333333333333333333333333E-50')).should == BigDecimal('0.12233333333333333333345679E-24')
@mixed.remainder(@pos_frac).should == @mixed % @pos_frac
@pos_int.remainder(@pos_frac).should == @pos_int % @pos_frac
@neg_frac.remainder(@neg_int).should == @neg_frac % @neg_int
@neg_int.remainder(@neg_frac).should == @neg_int % @neg_frac
end
it "means self-arg*(self/arg).truncate" do
@mixed.remainder(@neg_frac).should == @mixed - @neg_frac * (@mixed / @neg_frac).truncate
@pos_int.remainder(@neg_frac).should == @pos_int - @neg_frac * (@pos_int / @neg_frac).truncate
@neg_frac.remainder(@pos_int).should == @neg_frac - @pos_int * (@neg_frac / @pos_int).truncate
@neg_int.remainder(@pos_frac).should == @neg_int - @pos_frac * (@neg_int / @pos_frac).truncate
end
it "returns NaN used with zero" do
@mixed.remainder(@zero).nan?.should == true
@zero.remainder(@zero).nan?.should == true
end
it "returns zero if used on zero" do
@zero.remainder(@mixed).should == @zero
end
it "returns NaN if NaN is involved" do
@nan.remainder(@nan).nan?.should == true
@nan.remainder(@one).nan?.should == true
@one.remainder(@nan).nan?.should == true
@infinity.remainder(@nan).nan?.should == true
@nan.remainder(@infinity).nan?.should == true
end
it "returns NaN if Infinity is involved" do
@infinity.remainder(@infinity).nan?.should == true
@infinity.remainder(@one).nan?.should == true
@infinity.remainder(@mixed).nan?.should == true
@infinity.remainder(@one_minus).nan?.should == true
@infinity.remainder(@frac_1).nan?.should == true
@one.remainder(@infinity).nan?.should == true
@infinity_minus.remainder(@infinity_minus).nan?.should == true
@infinity_minus.remainder(@one).nan?.should == true
@one.remainder(@infinity_minus).nan?.should == true
@frac_2.remainder(@infinity_minus).nan?.should == true
@infinity.remainder(@infinity_minus).nan?.should == true
@infinity_minus.remainder(@infinity).nan?.should == true
end
it "coerces arguments to BigDecimal if possible" do
@one.remainder(2).should == @one
end
it "raises TypeError if the argument cannot be coerced to BigDecimal" do
lambda {
@one.remainder('2')
}.should raise_error(TypeError)
end
end
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