rsqrt.rb
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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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