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require File.expand_path('../../../spec_helper', __FILE__)
describe :complex_minus, shared: true do
describe "with Complex" do
it "subtracts both the real and imaginary components" do
(Complex(1, 2) - Complex(10, 20)).should == Complex(1 - 10, 2 - 20)
(Complex(1.5, 2.1) - Complex(100.2, -30.3)).should == Complex(1.5 - 100.2, 2.1 - (-30.3))
end
end
describe "with Integer" do
it "subtracts the real number from the real component of self" do
(Complex(1, 2) - 50).should == Complex(-49, 2)
(Complex(1, 2) - 50.5).should == Complex(-49.5, 2)
end
end
describe "with Object" do
it "tries to coerce self into other" do
value = Complex(3, 9)
obj = mock("Object")
obj.should_receive(:coerce).with(value).and_return([2, 5])
(value - obj).should == 2 - 5
end
end
describe "passed Numeric which responds to #real? with true" do
it "coerces the passed argument to the type of the real part and subtracts the resulting elements" do
n = mock_numeric('n')
n.should_receive(:real?).and_return(true)
n.should_receive(:coerce).with(1).and_return([1, 4])
(Complex(1, 2) - n).should == Complex(-3, 2)
end
end
describe "passed Numeric which responds to #real? with false" do
it "coerces the passed argument to Complex and subtracts the resulting elements" do
n = mock_numeric('n')
n.should_receive(:real?).and_return(false)
n.should_receive(:coerce).with(Complex(1, 2)).and_return([Complex(1, 2), Complex(3, 4)])
(Complex(1, 2) - n).should == Complex(-2, -2)
end
end
end
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