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81 lines
2.6 KiB
Ruby
81 lines
2.6 KiB
Ruby
require_relative '../../spec_helper'
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require 'bigdecimal'
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describe "BigDecimal#to_s" do
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before :each do
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@bigdec_str = "3.14159265358979323846264338327950288419716939937"
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@bigneg_str = "-3.1415926535897932384626433832795028841971693993"
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@bigdec = BigDecimal(@bigdec_str)
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@bigneg = BigDecimal(@bigneg_str)
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end
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it "return type is of class String" do
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@bigdec.to_s.kind_of?(String).should == true
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@bigneg.to_s.kind_of?(String).should == true
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end
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it "the default format looks like 0.xxxxenn" do
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@bigdec.to_s.should =~ /^0\.[0-9]*e[0-9]*$/
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end
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it "does not add an exponent for zero values" do
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BigDecimal("0").to_s.should == "0.0"
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BigDecimal("+0").to_s.should == "0.0"
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BigDecimal("-0").to_s.should == "-0.0"
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end
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it "takes an optional argument" do
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-> {@bigdec.to_s("F")}.should_not raise_error()
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end
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it "starts with + if + is supplied and value is positive" do
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@bigdec.to_s("+").should =~ /^\+.*/
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@bigneg.to_s("+").should_not =~ /^\+.*/
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end
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it "inserts a space every n chars, if integer n is supplied" do
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re =\
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/\A0\.314 159 265 358 979 323 846 264 338 327 950 288 419 716 939 937E1\z/i
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@bigdec.to_s(3).should =~ re
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str1 = '-123.45678 90123 45678 9'
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BigDecimal("-123.45678901234567890").to_s('5F').should == str1
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BigDecimal('1000010').to_s('5F').should == "10000 10.0"
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# trailing zeroes removed
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BigDecimal("1.00000000000").to_s('1F').should == "1.0"
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# 0 is treated as no spaces
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BigDecimal("1.2345").to_s('0F').should == "1.2345"
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end
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it "can return a leading space for values > 0" do
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@bigdec.to_s(" F").should =~ /\ .*/
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@bigneg.to_s(" F").should_not =~ /\ .*/
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end
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it "removes trailing spaces in floating point notation" do
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BigDecimal('-123.45678901234567890').to_s('F').should == "-123.4567890123456789"
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BigDecimal('1.2500').to_s('F').should == "1.25"
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BigDecimal('0000.00000').to_s('F').should == "0.0"
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BigDecimal('-00.000010000').to_s('F').should == "-0.00001"
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BigDecimal("5.00000E-2").to_s("F").should == "0.05"
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BigDecimal("500000").to_s("F").should == "500000.0"
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BigDecimal("5E2").to_s("F").should == "500.0"
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BigDecimal("-5E100").to_s("F").should == "-5" + "0" * 100 + ".0"
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end
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it "can use engineering notation" do
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@bigdec.to_s("E").should =~ /^0\.[0-9]*E[0-9]*$/i
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end
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it "can use conventional floating point notation" do
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%w[f F].each do |format_char|
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@bigdec.to_s(format_char).should == @bigdec_str
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@bigneg.to_s(format_char).should == @bigneg_str
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str2 = "+123.45678901 23456789"
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BigDecimal('123.45678901234567890').to_s("+8#{format_char}").should == str2
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end
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end
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end
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