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* Other ruby implementations use the spec/ruby directory. [Misc #13792] [ruby-core:82287] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
49 lines
1.8 KiB
Ruby
49 lines
1.8 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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describe :complex_multiply, shared: true do
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describe "with Complex" do
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it "multiplies according to the usual rule for complex numbers: (a + bi) * (c + di) = ac - bd + (ad + bc)i" do
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(Complex(1, 2) * Complex(10, 20)).should == Complex((1 * 10) - (2 * 20), (1 * 20) + (2 * 10))
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(Complex(1.5, 2.1) * Complex(100.2, -30.3)).should == Complex((1.5 * 100.2) - (2.1 * -30.3), (1.5 * -30.3) + (2.1 * 100.2))
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end
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end
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describe "with Integer" do
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it "multiplies both parts of self by the given Integer" do
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(Complex(3, 2) * 50).should == Complex(150, 100)
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(Complex(-3, 2) * 50.5).should == Complex(-151.5, 101)
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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([2, 5])
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(value * obj).should == 2 * 5
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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 "multiples both parts of self by 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(:*).with(other).and_return(1)
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imag.should_receive(:*).with(other).and_return(2)
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(Complex(real, imag) * other).should == Complex(1, 2)
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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 multiplies 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 * other).should == 10
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end
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end
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end
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end
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