require 'spec_helper'

describe Dydx::Algebra::Operator::Parts::Inverse do
  it { expect(inverse(x, :+).to_s).to eq('( - x )') }
  it { expect(inverse(x, :*).to_s).to eq('( 1 / x )') }

  it { expect(inverse(x, :+)).to eq(inverse(x, :+)) }
  it { expect(inverse(x, :*)).to eq(inverse(x, :*)) }

  it { expect(x - x).to eq(0) }
  it { expect(x / x).to eq(1) }
  it { expect(inverse(x, :+) + x).to eq(0) }
  it { expect(inverse(x, :*) * x).to eq(1) }
end