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30 lines
1 KiB
Ruby
30 lines
1 KiB
Ruby
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require File.expand_path('../../../spec_helper', __FILE__)
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describe "Bignum#**" do
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before :each do
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@bignum = bignum_value(47)
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end
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it "returns self raised to other power" do
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(@bignum ** 4).should == 7237005577332262361485077344629993318496048279512298547155833600056910050625
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(@bignum ** 1.2).should be_close(57262152889751597425762.57804, TOLERANCE)
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end
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it "raises a TypeError when given a non-Integer" do
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lambda { @bignum ** mock('10') }.should raise_error
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lambda { @bignum ** "10" }.should raise_error
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lambda { @bignum ** :symbol }.should raise_error
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end
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it "switch to a Float when the values is too big" do
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flt = (@bignum ** @bignum)
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flt.should be_kind_of(Float)
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flt.infinite?.should == 1
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end
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it "returns a complex number when negative and raised to a fractional power" do
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((-@bignum) ** (1.0/3)) .should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
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((-@bignum) ** Rational(1,3)).should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
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end
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end
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