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85 lines
3 KiB
Ruby
85 lines
3 KiB
Ruby
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require File.expand_path('../../../spec_helper', __FILE__)
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require 'bigdecimal'
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describe "BigDecimal#remainder" do
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before :each do
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@zero = BigDecimal("0")
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@one = BigDecimal("0")
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@mixed = BigDecimal("1.23456789")
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@pos_int = BigDecimal("2E5555")
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@neg_int = BigDecimal("-2E5555")
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@pos_frac = BigDecimal("2E-9999")
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@neg_frac = BigDecimal("-2E-9999")
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@nan = BigDecimal("NaN")
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@infinity = BigDecimal("Infinity")
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@infinity_minus = BigDecimal("-Infinity")
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@one_minus = BigDecimal("-1")
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@frac_1 = BigDecimal("1E-99999")
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@frac_2 = BigDecimal("0.9E-99999")
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end
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it "it equals modulo, if both values are of same sign" do
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BigDecimal('1234567890123456789012345679').remainder(BigDecimal('1')).should == @zero
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BigDecimal('123456789').remainder(BigDecimal('333333333333333333333333333E-50')).should == BigDecimal('0.12233333333333333333345679E-24')
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@mixed.remainder(@pos_frac).should == @mixed % @pos_frac
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@pos_int.remainder(@pos_frac).should == @pos_int % @pos_frac
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@neg_frac.remainder(@neg_int).should == @neg_frac % @neg_int
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@neg_int.remainder(@neg_frac).should == @neg_int % @neg_frac
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end
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it "means self-arg*(self/arg).truncate" do
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@mixed.remainder(@neg_frac).should == @mixed - @neg_frac * (@mixed / @neg_frac).truncate
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@pos_int.remainder(@neg_frac).should == @pos_int - @neg_frac * (@pos_int / @neg_frac).truncate
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@neg_frac.remainder(@pos_int).should == @neg_frac - @pos_int * (@neg_frac / @pos_int).truncate
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@neg_int.remainder(@pos_frac).should == @neg_int - @pos_frac * (@neg_int / @pos_frac).truncate
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end
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it "returns NaN used with zero" do
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@mixed.remainder(@zero).nan?.should == true
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@zero.remainder(@zero).nan?.should == true
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end
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it "returns zero if used on zero" do
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@zero.remainder(@mixed).should == @zero
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end
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it "returns NaN if NaN is involved" do
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@nan.remainder(@nan).nan?.should == true
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@nan.remainder(@one).nan?.should == true
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@one.remainder(@nan).nan?.should == true
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@infinity.remainder(@nan).nan?.should == true
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@nan.remainder(@infinity).nan?.should == true
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end
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it "returns NaN if Infinity is involved" do
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@infinity.remainder(@infinity).nan?.should == true
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@infinity.remainder(@one).nan?.should == true
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@infinity.remainder(@mixed).nan?.should == true
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@infinity.remainder(@one_minus).nan?.should == true
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@infinity.remainder(@frac_1).nan?.should == true
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@one.remainder(@infinity).nan?.should == true
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@infinity_minus.remainder(@infinity_minus).nan?.should == true
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@infinity_minus.remainder(@one).nan?.should == true
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@one.remainder(@infinity_minus).nan?.should == true
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@frac_2.remainder(@infinity_minus).nan?.should == true
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@infinity.remainder(@infinity_minus).nan?.should == true
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@infinity_minus.remainder(@infinity).nan?.should == true
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end
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it "coerces arguments to BigDecimal if possible" do
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@one.remainder(2).should == @one
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end
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it "raises TypeError if the argument cannot be coerced to BigDecimal" do
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lambda {
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@one.remainder('2')
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}.should raise_error(TypeError)
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end
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end
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