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name : rsqrt.rb

 require 'mathn'
require_relative '../fixtures/classes'

describe :mathn_math_rsqrt, shared: true do
  it "returns the square root for Rational numbers" do
    @object.send(:rsqrt, Rational(9, 25)).should == Rational(3, 5)
    @object.send(:rsqrt, 16/64).should == Rational(1, 2)
  end

  it "returns the square root for positive numbers" do
    @object.send(:rsqrt, 1).should == 1
    @object.send(:rsqrt, 4.0).should == 2.0
    @object.send(:rsqrt, 12.34).should == Math.sqrt!(12.34)
  end

  it "raises an Math::DomainError if the argument is a negative number" do
    -> { @object.send(:rsqrt, -1) }.should raise_error(Math::DomainError)
    -> { @object.send(:rsqrt, -4.0) }.should raise_error(Math::DomainError)
    -> { @object.send(:rsqrt, -16/64) }.should raise_error(Math::DomainError)
  end
end

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