diff options
Diffstat (limited to 'spec/rubyspec/library/bigdecimal/add_spec.rb')
| -rw-r--r-- | spec/rubyspec/library/bigdecimal/add_spec.rb | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/spec/rubyspec/library/bigdecimal/add_spec.rb b/spec/rubyspec/library/bigdecimal/add_spec.rb new file mode 100644 index 0000000000..6136c9dccb --- /dev/null +++ b/spec/rubyspec/library/bigdecimal/add_spec.rb @@ -0,0 +1,179 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +require 'bigdecimal' + +describe "BigDecimal#add" do + + before :each do + @one = BigDecimal("1") + @zero = BigDecimal("0") + @two = BigDecimal("2") + @three = BigDecimal("3") + @ten = BigDecimal("10") + @eleven = BigDecimal("11") + @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") + @frac_3 = BigDecimal("12345E10") + @frac_4 = BigDecimal("98765E10") + @dot_ones = BigDecimal("0.1111111111") + end + + it "returns a + b with given precision" do + # documentation states, that precision ist optional, but it ain't, + @two.add(@one, 1).should == @three + @one .add(@two, 1).should == @three + @one.add(@one_minus, 1).should == @zero + @ten.add(@one, 2).should == @eleven + @zero.add(@one, 1).should == @one + @frac_2.add(@frac_1, 10000).should == BigDecimal("1.9E-99999") + @frac_1.add(@frac_1, 10000).should == BigDecimal("2E-99999") + @frac_3.add(@frac_4, 0).should == BigDecimal("0.11111E16") + @frac_3.add(@frac_4, 1).should == BigDecimal("0.1E16") + @frac_3.add(@frac_4, 2).should == BigDecimal("0.11E16") + @frac_3.add(@frac_4, 3).should == BigDecimal("0.111E16") + @frac_3.add(@frac_4, 4).should == BigDecimal("0.1111E16") + @frac_3.add(@frac_4, 5).should == BigDecimal("0.11111E16") + @frac_3.add(@frac_4, 6).should == BigDecimal("0.11111E16") + end + + it "returns a + [Fixnum value] with given precision" do + (1..10).each {|precision| + @dot_ones.add(0, precision).should == BigDecimal("0." + "1" * precision) + } + BigDecimal("0.88").add(0, 1).should == BigDecimal("0.9") + end + + it "returns a + [Bignum value] with given precision" do + bignum = 10000000000000000000 + (1..20).each {|precision| + @dot_ones.add(bignum, precision).should == BigDecimal("0.1E20") + } + (21..30).each {|precision| + @dot_ones.add(bignum, precision).should == BigDecimal( + "0.10000000000000000000" + "1" * (precision - 20) + "E20") + } + end + +# TODO: +# http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/17374 +# +# This doesn't work on MRI and looks like a bug to me: +# one can use BigDecimal + Float, but not Bigdecimal.add(Float) +# +# it "returns a + [Float value] with given precision" do +# (1..10).each {|precision| +# @dot_ones.add(0.0, precision).should == BigDecimal("0." + "1" * precision) +# } +# +# BigDecimal("0.88").add(0.0, 1).should == BigDecimal("0.9") +# end + + it "favors the precision specified in the second argument over the global limit" do + BigDecimalSpecs.with_limit(1) do + BigDecimal('0.888').add(@zero, 3).should == BigDecimal('0.888') + end + + BigDecimalSpecs.with_limit(2) do + BigDecimal('0.888').add(@zero, 1).should == BigDecimal('0.9') + end + end + + it "uses the current rounding mode if rounding is needed" do + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_UP) do + BigDecimal('0.111').add(@zero, 1).should == BigDecimal('0.2') + BigDecimal('-0.111').add(@zero, 1).should == BigDecimal('-0.2') + end + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_DOWN) do + BigDecimal('0.999').add(@zero, 1).should == BigDecimal('0.9') + BigDecimal('-0.999').add(@zero, 1).should == BigDecimal('-0.9') + end + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_HALF_UP) do + BigDecimal('0.85').add(@zero, 1).should == BigDecimal('0.9') + BigDecimal('-0.85').add(@zero, 1).should == BigDecimal('-0.9') + end + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_HALF_DOWN) do + BigDecimal('0.85').add(@zero, 1).should == BigDecimal('0.8') + BigDecimal('-0.85').add(@zero, 1).should == BigDecimal('-0.8') + end + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_HALF_EVEN) do + BigDecimal('0.75').add(@zero, 1).should == BigDecimal('0.8') + BigDecimal('0.85').add(@zero, 1).should == BigDecimal('0.8') + BigDecimal('-0.75').add(@zero, 1).should == BigDecimal('-0.8') + BigDecimal('-0.85').add(@zero, 1).should == BigDecimal('-0.8') + end + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_CEILING) do + BigDecimal('0.85').add(@zero, 1).should == BigDecimal('0.9') + BigDecimal('-0.85').add(@zero, 1).should == BigDecimal('-0.8') + end + BigDecimalSpecs.with_rounding(BigDecimal::ROUND_FLOOR) do + BigDecimal('0.85').add(@zero, 1).should == BigDecimal('0.8') + BigDecimal('-0.85').add(@zero, 1).should == BigDecimal('-0.9') + end + end + + it "uses the default ROUND_HALF_UP rounding if it wasn't explicitly changed" do + BigDecimal('0.85').add(@zero, 1).should == BigDecimal('0.9') + BigDecimal('-0.85').add(@zero, 1).should == BigDecimal('-0.9') + end + + it "returns NaN if NaN is involved" do + @one.add(@nan, 10000).nan?.should == true + @nan.add(@one, 1).nan?.should == true + end + + it "returns Infinity or -Infinity if these are involved" do + @zero.add(@infinity, 1).should == @infinity + @frac_2.add(@infinity, 1).should == @infinity + @one_minus.add(@infinity, 1).should == @infinity + @two.add(@infinity, 1).should == @infinity + + @zero.add(@infinity_minus, 1).should == @infinity_minus + @frac_2.add(@infinity_minus, 1).should == @infinity_minus + @one_minus.add(@infinity_minus, 1).should == @infinity_minus + @two.add(@infinity_minus, 1).should == @infinity_minus + + @infinity.add(@zero, 1).should == @infinity + @infinity.add(@frac_2, 1).should == @infinity + @infinity.add(@one_minus, 1).should == @infinity + @infinity.add(@two, 1).should == @infinity + + @infinity_minus.add(@zero, 1).should == @infinity_minus + @infinity_minus.add(@frac_2, 1).should == @infinity_minus + @infinity_minus.add(@one_minus, 1).should == @infinity_minus + @infinity_minus.add(@two, 1).should == @infinity_minus + + @infinity.add(@infinity, 10000).should == @infinity + @infinity_minus.add(@infinity_minus, 10000).should == @infinity_minus + end + + it "returns NaN if Infinity + (- Infinity)" do + @infinity.add(@infinity_minus, 10000).nan?.should == true + @infinity_minus.add(@infinity, 10000).nan?.should == true + end + + it "raises TypeError when adds nil" do + lambda { + @one.add(nil, 10) + }.should raise_error(TypeError) + lambda { + @one.add(nil, 0) + }.should raise_error(TypeError) + end + + it "raises TypeError when precision parameter is nil" do + lambda { + @one.add(@one, nil) + }.should raise_error(TypeError) + end + + it "raises ArgumentError when precision parameter is negative" do + lambda { + @one.add(@one, -10) + }.should raise_error(ArgumentError) + end +end |