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describe :complex_arg, shared: true do
it "returns the argument -- i.e., the angle from (1, 0) in the complex plane" do
two_pi = 2 * Math::PI
(Complex(1, 0).send(@method) % two_pi).should be_close(0, TOLERANCE)
(Complex(0, 2).send(@method) % two_pi).should be_close(Math::PI * 0.5, TOLERANCE)
(Complex(-100, 0).send(@method) % two_pi).should be_close(Math::PI, TOLERANCE)
(Complex(0, -75.3).send(@method) % two_pi).should be_close(Math::PI * 1.5, TOLERANCE)
end
end
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