ruby--ruby/spec/ruby/core/complex/coerce_spec.rb

require_relative '../../spec_helper'

describe "Complex#coerce" do
  before :each do
    @one = Complex(1)
  end

  it "returns an array containing other and self as Complex when other is an Integer" do
    result = @one.coerce(2)
    result.should == [2, 1]
    result.first.should be_kind_of(Complex)
    result.last.should be_kind_of(Complex)
  end

  it "returns an array containing other and self as Complex when other is a Float" do
    result = @one.coerce(20.5)
    result.should == [20.5, 1]
    result.first.should be_kind_of(Complex)
    result.last.should be_kind_of(Complex)
  end

  it "returns an array containing other and self as Complex when other is a Bignum" do
    result = @one.coerce(4294967296)
    result.should == [4294967296, 1]
    result.first.should be_kind_of(Complex)
    result.last.should be_kind_of(Complex)
  end

  it "returns an array containing other and self as Complex when other is a Rational" do
    result = @one.coerce(Rational(5,6))
    result.should == [Rational(5,6), 1]
    result.first.should be_kind_of(Complex)
    result.last.should be_kind_of(Complex)
  end

  it "returns an array containing other and self when other is a Complex" do
    other = Complex(2)
    result = @one.coerce(other)
    result.should == [other, @one]
    result.first.should equal(other)
    result.last.should equal(@one)
  end

  it "returns an array containing other as Complex and self when other is a Numeric which responds to #real? with true" do
    other = mock_numeric('other')
    other.should_receive(:real?).any_number_of_times.and_return(true)
    result = @one.coerce(other)
    result.should == [other, @one]
    result.first.should eql(Complex(other))
    result.last.should equal(@one)
  end

  it "raises TypeError when other is a Numeric which responds to #real? with false" do
    other = mock_numeric('other')
    other.should_receive(:real?).any_number_of_times.and_return(false)
    lambda { @one.coerce(other) }.should raise_error(TypeError)
  end

  it "raises a TypeError when other is a String" do
    lambda { @one.coerce("20") }.should raise_error(TypeError)
  end

  it "raises a TypeError when other is nil" do
    lambda { @one.coerce(nil) }.should raise_error(TypeError)
  end

  it "raises a TypeError when other is false" do
    lambda { @one.coerce(false) }.should raise_error(TypeError)
  end
end