Add book model testing

Author: PivtoranisV

spec/factories/books.rb

@@ -0,0 +1,8 @@
+FactoryBot.define do
+  factory :book do
+    title { Faker::Book.title }
+    author { Faker::Book.author }
+    description { Faker::Lorem.paragraph }
+    association :recommender, factory: :user
+  end
+end

spec/models/book_spec.rb

@@ -0,0 +1,35 @@
+require 'rails_helper'
+
+describe Book, type: :model do
+  let(:book) { create(:book) }
+
+  it 'is expected to have a valid factory' do
+    expect(book.valid?).to eq true
+  end
+
+  context 'Associations' do
+    it { should belong_to(:recommender).class_name('User') }
+  end
+
+  context 'Validations' do
+    it { should validate_presence_of(:recommender) }
+    it { should validate_presence_of(:title) }
+    it { should validate_presence_of(:author) }
+    it { should validate_presence_of(:description) }
+
+    it 'is invalid without a title' do
+      book.title = nil
+      expect(book.valid?).to eq false
+    end
+
+    it 'is invalid without a recommender' do
+      book.recommender = nil
+      expect(book.valid?).to eq false
+    end
+
+    it "is not valid with a empty title" do
+      book.title = ''
+      expect(book).to_not be_valid
+    end
+  end
+end