# Specs shared by Kernel#Complex() and String#to_c()
describe :kernel_complex, shared: true do

  it "returns a Complex object" do
    @object.send(@method, '9').should be_an_instance_of(Complex)
  end

  it "understands integers" do
    @object.send(@method, '20').should == Complex(20)
  end

  it "understands negative integers" do
    @object.send(@method, '-3').should == Complex(-3)
  end

  it "understands fractions (numerator/denominator) for the real part" do
    @object.send(@method, '2/3').should == Complex(Rational(2, 3))
  end

  it "understands fractions (numerator/denominator) for the imaginary part" do
    @object.send(@method, '4+2/3i').should == Complex(4, Rational(2, 3))
  end

  it "understands negative fractions (-numerator/denominator) for the real part" do
    @object.send(@method, '-2/3').should == Complex(Rational(-2, 3))
  end

  it "understands negative fractions (-numerator/denominator) for the imaginary part" do
    @object.send(@method, '7-2/3i').should == Complex(7, Rational(-2, 3))
  end

  it "understands floats (a.b) for the real part" do
    @object.send(@method, '2.3').should == Complex(2.3)
  end

  it "understands floats (a.b) for the imaginary part" do
    @object.send(@method, '4+2.3i').should == Complex(4, 2.3)
  end

  it "understands negative floats (-a.b) for the real part" do
    @object.send(@method, '-2.33').should == Complex(-2.33)
  end

  it "understands negative floats (-a.b) for the imaginary part" do
    @object.send(@method, '7-28.771i').should == Complex(7, -28.771)
  end

  it "understands an integer followed by 'i' to mean that integer is the imaginary part" do
    @object.send(@method, '35i').should == Complex(0,35)
  end

  it "understands a negative integer followed by 'i' to mean that negative integer is the imaginary part" do
    @object.send(@method, '-29i').should == Complex(0,-29)
  end

  it "understands an 'i' by itself as denoting a complex number with an imaginary part of 1" do
    @object.send(@method, 'i').should == Complex(0,1)
  end

  it "understands a '-i' by itself as denoting a complex number with an imaginary part of -1" do
    @object.send(@method, '-i').should == Complex(0,-1)
  end

  it "understands 'a+bi' to mean a complex number with 'a' as the real part, 'b' as the imaginary" do
    @object.send(@method, '79+4i').should == Complex(79,4)
  end

  it "understands 'a-bi' to mean a complex number with 'a' as the real part, '-b' as the imaginary" do
    @object.send(@method, '79-4i').should == Complex(79,-4)
  end

  it "understands 'a+i' to mean a complex number with 'a' as the real part, 1i as the imaginary" do
    @object.send(@method, '79+i').should == Complex(79, 1)
  end

  it "understands 'a-i' to mean a complex number with 'a' as the real part, -1i as the imaginary" do
    @object.send(@method, '79-i').should == Complex(79, -1)
  end

  it "understands i, I, j, and J imaginary units" do
    @object.send(@method, '79+4i').should == Complex(79, 4)
    @object.send(@method, '79+4I').should == Complex(79, 4)
    @object.send(@method, '79+4j').should == Complex(79, 4)
    @object.send(@method, '79+4J').should == Complex(79, 4)
  end

  it "understands scientific notation for the real part" do
    @object.send(@method, '2e3+4i').should == Complex(2e3,4)
  end

  it "understands negative scientific notation for the real part" do
    @object.send(@method, '-2e3+4i').should == Complex(-2e3,4)
  end

  it "understands scientific notation for the imaginary part" do
    @object.send(@method, '4+2e3i').should == Complex(4, 2e3)
  end

  it "understands negative scientific notation for the imaginary part" do
    @object.send(@method, '4-2e3i').should == Complex(4, -2e3)
  end

  it "understands scientific notation for the real and imaginary part in the same String" do
    @object.send(@method, '2e3+2e4i').should == Complex(2e3,2e4)
  end

  it "understands negative scientific notation for the real and imaginary part in the same String" do
    @object.send(@method, '-2e3-2e4i').should == Complex(-2e3,-2e4)
  end

  it "understands scientific notation with e and E" do
    @object.send(@method, '2e3+2e4i').should == Complex(2e3, 2e4)
    @object.send(@method, '2E3+2E4i').should == Complex(2e3, 2e4)
  end

  it "understands 'm@a' to mean a complex number in polar form with 'm' as the modulus, 'a' as the argument" do
    @object.send(@method, '79@4').should == Complex.polar(79, 4)
    @object.send(@method, '-79@4').should == Complex.polar(-79, 4)
    @object.send(@method, '79@-4').should == Complex.polar(79, -4)
  end

  it "ignores leading whitespaces" do
    @object.send(@method, '  79+4i').should == Complex(79, 4)
  end

  it "ignores trailing whitespaces" do
    @object.send(@method, '79+4i  ').should == Complex(79, 4)
  end

  it "understands _" do
    @object.send(@method, '7_9+4_0i').should == Complex(79, 40)
  end
end