describe 'self.inherited' do
  before do
    class Foo
      def self.inherited klass; end
    end

    Foo.stub(:inherited)

    class Bar < Foo; end
  end

  it 'should call self.inherited' do
    # this fails if it doesn't run first
    expect(Foo).to have_received(:inherited).with Bar
  end

  it 'should do something else' do
    expect(true).to eq true
  end
end

describe 'self.inherited once' do
  before do
    class Foo
      def self.inherited klass; end
    end

    Foo.stub(:inherited)

    class Bar < Foo; end
  end

  it 'should call self.inherited' do
    @tested ||= false
    unless @tested
      expect(Foo).to have_receive(:inherited).with Bar
      @tested = true
    end
  end

  it 'should do something else' do
    expect(true).to eq true
  end
end

describe 'self.inherited' do

  before do
    class Foo
      def self.inherited klass; end
    end
    # For testing other properties of subclasses
    class Baz < Foo; end
  end

  it 'should call self.inherited' do
    Foo.stub(:inherited)
    class Bar < Foo; end
    expect(Foo).to have_received(:inherited).with Bar
  end

  it 'should do something else' do
    expect(true).to eq true
  end
end