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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
55 lines
1.7 KiB
Ruby
55 lines
1.7 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require 'bigdecimal'
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describe "BigDecimal#to_f" do
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before :each do
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@one = BigDecimal("1")
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@zero = BigDecimal("0")
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@zero_pos = BigDecimal("+0")
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@zero_neg = BigDecimal("-0")
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@two = BigDecimal("2")
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@three = BigDecimal("3")
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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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@vals = [@one, @zero, @two, @three, @frac_1, @frac_2]
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@spec_vals = [@zero_pos, @zero_neg, @nan, @infinity, @infinity_minus]
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end
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it "returns number of type float" do
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BigDecimal("3.14159").to_f.should be_kind_of(Float)
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@vals.each { |val| val.to_f.should be_kind_of(Float) }
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@spec_vals.each { |val| val.to_f.should be_kind_of(Float) }
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end
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it "rounds correctly to Float precision" do
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bigdec = BigDecimal("3.141592653589793238462643383279502884197169399375")
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bigdec.to_f.should be_close(3.14159265358979, TOLERANCE)
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@one.to_f.should == 1.0
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@two.to_f.should == 2.0
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@three.to_f.should be_close(3.0, TOLERANCE)
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@one_minus.to_f.should == -1.0
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# regression test for [ruby-talk:338957]
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BigDecimal("10.03").to_f.should == 10.03
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end
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it "properly handles special values" do
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@zero.to_f.should == 0
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@zero.to_f.to_s.should == "0.0"
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@nan.to_f.nan?.should == true
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@infinity.to_f.infinite?.should == 1
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@infinity_minus.to_f.infinite?.should == -1
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end
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it "remembers negative zero when converted to float" do
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@zero_neg.to_f.should == 0
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@zero_neg.to_f.to_s.should == "-0.0"
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end
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end
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