Add Post model

spec/factories/posts.rb

@@ -0,0 +1,9 @@
+FactoryBot.define do
+  factory :post do
+    title { "Post Title" }
+    description { "Post Description" }
+    board
+    user
+    post_status
+  end
+end

spec/models/post_spec.rb

@@ -0,0 +1,55 @@
+require 'rails_helper'
+
+RSpec.describe Post, type: :model do
+  let(:post) { FactoryBot.build(:post) }
+
+  it 'should be valid' do
+    expect(post).to be_valid
+  end
+
+  it 'has a non-null and non-empty title' do
+    nil_post = FactoryBot.build(:post, title: nil)
+    empty_post = FactoryBot.build(:post, title: "")
+
+    expect(nil_post).to be_invalid
+    expect(empty_post).to be_invalid
+  end
+
+  it 'has a title between 4 and 64 characters' do
+    too_short_post = FactoryBot.build(:post, title: "a" * 3)
+    short_post = FactoryBot.build(:post, title: "a" * 4)
+    long_post = FactoryBot.build(:post, title: "a" * 64)
+    too_long_post = FactoryBot.build(:post, title: "a" * 65)
+
+    expect(too_short_post).to be_invalid
+    expect(short_post).to be_valid
+    expect(long_post).to be_valid
+    expect(too_long_post).to be_invalid
+  end
+
+  it 'has a description that can be nil or empty' do
+    nil_description_post = FactoryBot.build(:post, description: nil)
+    empty_description_post = FactoryBot.build(:post, description: "")
+
+    expect(nil_description_post).to be_valid
+    expect(empty_description_post).to be_valid
+  end
+
+  it 'has a reference to a post status that can be nil' do
+    no_status_post = FactoryBot.build(:post, post_status_id: nil)
+    
+    expect(no_status_post).to be_valid
+  end
+
+  it 'has a reference to a user than cannot be nil' do
+    no_user_post = FactoryBot.build(:post, user_id: nil)
+
+    expect(no_user_post).to be_invalid
+  end
+
+  it 'has a reference to a board than cannot be nil' do
+    no_board_post = FactoryBot.build(:post, board_id: nil)
+
+    expect(no_board_post).to be_invalid
+  end
+end