social_auth_service_spec.rb

    let(:inst_client) { double(user: inst_user) }

    let(:inst_user) do
      # instance_double(Instagram::Client, id:           instagram_id,
      double(id:           instagram_id,
                                 access_token: access_token,
                                 username:     name,
                                 full_name:    'John Doe',
                                 picture:      picture)
    end

    before do
      user.update(instagram_id: instagram_id)
      # allow(Instagram::Client).to receive(:user).and_return(inst_user)
    end

    context 'when user found by Instagram id' do
      it 'returns user object' do
        allow(Instagram).to receive(:client).and_return(inst_user)
        # double(Instagram::Client, client: inst_client)
        # allow(Instagram::Client).to receive(:user).and_return(inst_user)
        # byebug
        expect(subject).to eq(user)
      end
    end