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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
27 lines
806 B
Ruby
27 lines
806 B
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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describe "Math.cbrt" do
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it "returns a float" do
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Math.cbrt(1).should be_an_instance_of(Float)
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end
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it "returns the cubic root of the argument" do
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Math.cbrt(1).should == 1.0
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Math.cbrt(8.0).should == 2.0
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Math.cbrt(-8.0).should == -2.0
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Math.cbrt(3).should be_close(1.44224957030741, TOLERANCE)
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end
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it "raises a TypeError if the argument cannot be coerced with Float()" do
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lambda { Math.cbrt("foobar") }.should raise_error(TypeError)
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end
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it "raises a TypeError if the argument is nil" do
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lambda { Math.cbrt(nil) }.should raise_error(TypeError)
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end
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it "accepts any argument that can be coerced with Float()" do
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Math.cbrt(MathSpecs::Float.new).should be_close(1.0, TOLERANCE)
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end
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end
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