user_spec.rb

require 'spec_helper'

describe User do

  before { @user = User.new(name: "Example User", email: "user@example.com", password: "foobar", password_confirmation: "foobar") }

  subject { @user }

  it { should respond_to(:name) }
  it { should respond_to(:email) }
  it { should respond_to(:password_digest) }
  it { should respond_to(:password) }
  it { should respond_to(:password_confirmation) }
  it { should respond_to(:authenticate) }
  
  it { should be_valid }

  describe "when a name is not present" do
    before { @user.name = " " }
    it { should_not be_valid }
  end

  describe "when an email is not present" do
    before { @user.email = " " }
    it { should_not be_valid }
  end

  describe "when names are too long" do
    before { @user.name = "a" * 51 }
    it { should_not be_valid }
  end

  describe "when email format is invalid" do
    it "should be invalid" do
      
      addresses = %w[
        user@foo,com
        user_at_foo.org
        example.user@foo.
        foo@bar_baz.com
        foo@bar+baz.com
      ]
      
      addresses.each do |invalid_email|
        @user.email = invalid_email
        expect(@user).not_to be_valid
      end
    end
  end

  describe "when email format is valid" do
    it "should be valid" do
      addresses = %w[
        user@foo.COM
        A_US-ER@f.b.org
        frst.lst@foo.jp
        a+b@baz.cn
      ]

      addresses.each do |valid_email|
        @user.email = valid_email
        expect(@user).to be_valid
      end
    end
  end

  describe "when an email address is already taken" do

    before do
      user_with_same_email = @user.dup
      user_with_same_email.email = @user.email.upcase
      user_with_same_email.save
    end

    it { should_not be_valid }
  end

  describe "when password is not present" do
    before do
      @user = User.new(name: "Example User", email: "user@example.com", password: " ", password_confirmation: " ")
    end
    it { should_not be_valid }
  end

  describe "when the password doesn't match confirmation" do
    before { @user.password_confirmation = "mismatch" }
  end

  describe "when the password confirmation is nil" do
    before do
      @user = User.new(name: "Rambo", email: "john@firstblood.com", password: "foobar", password_confirmation: nil)
    end

    it { should_not be_valid }
  end

  describe "with a password that is too short" do
    before { @user.password = @user.password_confirmation = "a" * 5 }
    it { should be_invalid }
  end

  describe "return value of authenticate method" do
    before { @user.save }
    let(:found_user) { User.find_by(email: @user.email) }

    describe "with a valid password" do
      it { should eq found_user.authenticate(@user.password) }
    end

    describe "with an invalid password" do
      let(:user_for_invalid_password) { found_user.authenticate('invalid') }

      it { should_not eq user_for_invalid_password }
      specify { expect(user_for_invalid_password).to be_false }
    end
  end
end