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39 lines
1.1 KiB
Ruby
39 lines
1.1 KiB
Ruby
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require File.expand_path('../../../spec_helper', __FILE__)
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require File.expand_path('../shared/power', __FILE__)
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require 'bigdecimal'
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describe "BigDecimal#**" do
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it_behaves_like(:bigdecimal_power, :**)
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end
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describe "BigDecimal#exponent" do
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it "returns an Integer" do
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BigDecimal("2E100000000").exponent.kind_of?(Integer).should == true
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BigDecimal("2E-999").exponent.kind_of?(Integer).should == true
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end
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it "is n if number can be represented as 0.xxx*10**n" do
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BigDecimal("2E1000").exponent.should == 1001
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BigDecimal("1234567E10").exponent.should == 17
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end
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# commenting this spec out after discussion with Defiler, since it seems to be an MRI bug, not a real feature
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=begin
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platform_is wordsize: 32 do
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# TODO: write specs for both 32 and 64 bit
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it "returns 0 if exponent can't be represented as Fixnum" do
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BigDecimal("2E1000000000000000").exponent.should == 0
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BigDecimal("-5E-999999999999999").exponent.should == 0
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end
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end
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=end
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it "returns 0 if self is 0" do
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BigDecimal("0").exponent.should == 0
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BigDecimal("+0").exponent.should == 0
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BigDecimal("-0").exponent.should == 0
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end
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end
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