after_user_spec.rb

RSpec.describe User do
  context "with correct parameters" do
    subject { build(:user) }
    it { is_expected.to be_valid }
  end

  describe "User has properties" do
    subject { build(:user) }

    it { is_expected.to respond_to :screen_name }
    it { is_expected.to respond_to :name }
    it { is_expected.to respond_to :password_digest }
    it { is_expected.to respond_to :password }
    it { is_expected.to respond_to :password_confirmation }
  end

  describe '.screen_name' do
    let(:user) { build(:user) }
    subject { user }

    context "with blank" do
      before { user.screen_name = " " }

      it { is_expected.not_to be_valid }
    end

    context "with 15 characters" do
      before { user.screen_name = "c" * 15 }

      it { is_expected.to be_valid }
    end

    context "with exceeds 15 characters" do
      before { user.screen_name = "c" * 16 }

      it { is_expected.not_to be_valid }
    end

    context "when exist same screen_name user" do
      before {
        user_with_same_screen_name = user.dup
        user_with_same_screen_name.save
      }

      it { is_expected.not_to be_valid }
    end

    context "with exist same UPCASE screen_name user" do
      before {
        user_with_same_screen_name = user.dup
        user_with_same_screen_name.screen_name = user.screen_name.upcase
        user_with_same_screen_name.save
      }

      it { is_expected.not_to be_valid }
    end
  end

  context "when name is not present" do
    subject { build(:user, name: "") }

    it { is_expected.not_to be_valid }
  end

  describe '.password' do
    context "with blank" do
      let(:user) { build(:user, password: " ") }
      subject { user }

      it { is_expected.not_to be_valid }
    end
  end

  describe '.password_confirmation' do
    let(:user) { build(:user) }
    subject { user }

    context "with wrong password_confirmation" do
      before { user.password_confirmation = "mismatch password" }

      it { is_expected.not_to be_valid }
    end
  end
end