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require_relative '../../spec_helper'
describe "Kernel.Complex()" do
describe "when passed [Complex, Complex]" do
it "returns a new Complex number based on the two given numbers" do
Complex(Complex(3, 4), Complex(5, 6)).should == Complex(3 - 6, 4 + 5)
Complex(Complex(1.5, 2), Complex(-5, 6.3)).should == Complex(1.5 - 6.3, 2 - 5)
end
end
describe "when passed [Complex]" do
it "returns the passed Complex number" do
Complex(Complex(1, 2)).should == Complex(1, 2)
Complex(Complex(-3.4, bignum_value)).should == Complex(-3.4, bignum_value)
end
end
describe "when passed [Integer, Integer]" do
it "returns a new Complex number" do
Complex(1, 2).should be_an_instance_of(Complex)
Complex(1, 2).real.should == 1
Complex(1, 2).imag.should == 2
Complex(-3, -5).should be_an_instance_of(Complex)
Complex(-3, -5).real.should == -3
Complex(-3, -5).imag.should == -5
Complex(3.5, -4.5).should be_an_instance_of(Complex)
Complex(3.5, -4.5).real.should == 3.5
Complex(3.5, -4.5).imag.should == -4.5
Complex(bignum_value, 30).should be_an_instance_of(Complex)
Complex(bignum_value, 30).real.should == bignum_value
Complex(bignum_value, 30).imag.should == 30
end
end
describe "when passed [Integer/Float]" do
it "returns a new Complex number with 0 as the imaginary component" do
# Guard against the Mathn library
guard -> { !defined?(Math.rsqrt) } do
Complex(1).should be_an_instance_of(Complex)
Complex(1).imag.should == 0
Complex(1).real.should == 1
Complex(-3).should be_an_instance_of(Complex)
Complex(-3).imag.should == 0
Complex(-3).real.should == -3
Complex(-4.5).should be_an_instance_of(Complex)
Complex(-4.5).imag.should == 0
Complex(-4.5).real.should == -4.5
Complex(bignum_value).should be_an_instance_of(Complex)
Complex(bignum_value).imag.should == 0
Complex(bignum_value).real.should == bignum_value
end
end
end
describe "when passed a String" do
it "needs to be reviewed for spec completeness"
end
describe "when passed an Object which responds to #to_c" do
it "returns the passed argument" do
obj = Object.new; def obj.to_c; 1i end
Complex(obj).should == Complex(0, 1)
end
end
describe "when passed a Numeric which responds to #real? with false" do
it "returns the passed argument" do
n = mock_numeric("unreal")
n.should_receive(:real?).any_number_of_times.and_return(false)
Complex(n).should equal(n)
end
end
describe "when passed a Numeric which responds to #real? with true" do
it "returns a Complex with the passed argument as the real component and 0 as the imaginary component" do
n = mock_numeric("real")
n.should_receive(:real?).any_number_of_times.and_return(true)
result = Complex(n)
result.real.should equal(n)
result.imag.should equal(0)
end
end
describe "when passed Numerics n1 and n2 and at least one responds to #real? with false" do
[[false, false], [false, true], [true, false]].each do |r1, r2|
it "returns n1 + n2 * Complex(0, 1)" do
n1 = mock_numeric("n1")
n2 = mock_numeric("n2")
n3 = mock_numeric("n3")
n4 = mock_numeric("n4")
n1.should_receive(:real?).any_number_of_times.and_return(r1)
n2.should_receive(:real?).any_number_of_times.and_return(r2)
n2.should_receive(:*).with(Complex(0, 1)).and_return(n3)
n1.should_receive(:+).with(n3).and_return(n4)
Complex(n1, n2).should equal(n4)
end
end
end
describe "when passed two Numerics and both respond to #real? with true" do
it "returns a Complex with the passed arguments as real and imaginary components respectively" do
n1 = mock_numeric("n1")
n2 = mock_numeric("n2")
n1.should_receive(:real?).any_number_of_times.and_return(true)
n2.should_receive(:real?).any_number_of_times.and_return(true)
result = Complex(n1, n2)
result.real.should equal(n1)
result.imag.should equal(n2)
end
end
describe "when passed a single non-Numeric" do
it "coerces the passed argument using #to_c" do
n = mock("n")
c = Complex(0, 0)
n.should_receive(:to_c).and_return(c)
Complex(n).should equal(c)
end
end
describe "when passed a non-Numeric second argument" do
it "raises TypeError" do
lambda { Complex(:sym, :sym) }.should raise_error(TypeError)
lambda { Complex(0, :sym) }.should raise_error(TypeError)
end
end
describe "when passed nil" do
it "raises TypeError" do
lambda { Complex(nil) }.should raise_error(TypeError, "can't convert nil into Complex")
lambda { Complex(0, nil) }.should raise_error(TypeError, "can't convert nil into Complex")
lambda { Complex(nil, 0) }.should raise_error(TypeError, "can't convert nil into Complex")
end
end
end
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