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82 lines
3 KiB
Ruby
82 lines
3 KiB
Ruby
describe :complex_divide, shared: true do
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describe "with Complex" do
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it "divides according to the usual rule for complex numbers" do
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a = Complex((1 * 10) - (2 * 20), (1 * 20) + (2 * 10))
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b = Complex(1, 2)
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a.send(@method, b).should == Complex(10, 20)
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c = Complex((1.5 * 100.2) - (2.1 * -30.3), (1.5 * -30.3) + (2.1 * 100.2))
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d = Complex(1.5, 2.1)
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# remember the floating-point arithmetic
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c.send(@method, d).should be_close(Complex(100.2, -30.3), TOLERANCE)
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end
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end
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describe "with Fixnum" do
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it "divides both parts of the Complex number" do
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Complex(20, 40).send(@method, 2).should == Complex(10, 20)
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Complex(30, 30).send(@method, 10).should == Complex(3, 3)
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end
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it "raises a ZeroDivisionError when given zero" do
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-> { Complex(20, 40).send(@method, 0) }.should raise_error(ZeroDivisionError)
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end
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it "produces Rational parts" do
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Complex(5, 9).send(@method, 2).should eql(Complex(Rational(5,2), Rational(9,2)))
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end
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end
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describe "with Bignum" do
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it "divides both parts of the Complex number" do
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Complex(20, 40).send(@method, 2).should == Complex(10, 20)
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Complex(15, 16).send(@method, 2.0).should be_close(Complex(7.5, 8), TOLERANCE)
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end
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end
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describe "with Float" do
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it "divides both parts of the Complex number" do
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Complex(3, 9).send(@method, 1.5).should == Complex(2, 6)
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Complex(15, 16).send(@method, 2.0).should be_close(Complex(7.5, 8), TOLERANCE)
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end
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it "returns Complex(Infinity, Infinity) when given zero" do
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Complex(20, 40).send(@method, 0.0).real.infinite?.should == 1
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Complex(20, 40).send(@method, 0.0).imag.infinite?.should == 1
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Complex(-20, 40).send(@method, 0.0).real.infinite?.should == -1
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Complex(-20, 40).send(@method, 0.0).imag.infinite?.should == 1
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end
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end
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describe "with Object" do
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it "tries to coerce self into other" do
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value = Complex(3, 9)
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obj = mock("Object")
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obj.should_receive(:coerce).with(value).and_return([4, 2])
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value.send(@method, obj).should == 2
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end
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end
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describe "with a Numeric which responds to #real? with true" do
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it "returns Complex(real.quo(other), imag.quo(other))" do
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other = mock_numeric('other')
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real = mock_numeric('real')
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imag = mock_numeric('imag')
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other.should_receive(:real?).and_return(true)
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real.should_receive(:quo).with(other).and_return(1)
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imag.should_receive(:quo).with(other).and_return(2)
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Complex(real, imag).send(@method, other).should == Complex(1, 2)
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end
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end
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describe "with a Numeric which responds to #real? with false" do
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it "coerces the passed argument to Complex and divides the resulting elements" do
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complex = Complex(3, 0)
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other = mock_numeric('other')
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other.should_receive(:real?).any_number_of_times.and_return(false)
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other.should_receive(:coerce).with(complex).and_return([5, 2])
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complex.send(@method, other).should eql(Rational(5, 2))
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end
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end
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end
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