mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
e87fb88be8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64831 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
49 lines
1.8 KiB
Ruby
49 lines
1.8 KiB
Ruby
require_relative '../../spec_helper'
|
|
|
|
describe "Complex#*" do
|
|
describe "with Complex" do
|
|
it "multiplies according to the usual rule for complex numbers: (a + bi) * (c + di) = ac - bd + (ad + bc)i" do
|
|
(Complex(1, 2) * Complex(10, 20)).should == Complex((1 * 10) - (2 * 20), (1 * 20) + (2 * 10))
|
|
(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))
|
|
end
|
|
end
|
|
|
|
describe "with Integer" do
|
|
it "multiplies both parts of self by the given Integer" do
|
|
(Complex(3, 2) * 50).should == Complex(150, 100)
|
|
(Complex(-3, 2) * 50.5).should == Complex(-151.5, 101)
|
|
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 "with a Numeric which responds to #real? with true" do
|
|
it "multiples both parts of self by other" do
|
|
other = mock_numeric('other')
|
|
real = mock_numeric('real')
|
|
imag = mock_numeric('imag')
|
|
other.should_receive(:real?).and_return(true)
|
|
real.should_receive(:*).with(other).and_return(1)
|
|
imag.should_receive(:*).with(other).and_return(2)
|
|
(Complex(real, imag) * other).should == Complex(1, 2)
|
|
end
|
|
|
|
describe "with a Numeric which responds to #real? with false" do
|
|
it "coerces the passed argument to Complex and multiplies the resulting elements" do
|
|
complex = Complex(3, 0)
|
|
other = mock_numeric('other')
|
|
other.should_receive(:real?).any_number_of_times.and_return(false)
|
|
other.should_receive(:coerce).with(complex).and_return([5, 2])
|
|
(complex * other).should == 10
|
|
end
|
|
end
|
|
end
|
|
end
|