Feature/add inbox specs (#192)

* Add base Inbox association and validation specs

* `#facebook?``

* `#add_member` and `#remove_member`

* cleanup

* Rubocop

* Rubocop but again

really this time

spec/models/inbox_spec.rb

@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Inbox do
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:account_id) }
+  end
+
+  describe 'associations' do
+    it { is_expected.to belong_to(:account) }
+
+    it { is_expected.to belong_to(:channel) }
+
+    it { is_expected.to have_many(:contact_inboxes).dependent(:destroy) }
+
+    it { is_expected.to have_many(:contacts).through(:contact_inboxes) }
+
+    it { is_expected.to have_many(:inbox_members).dependent(:destroy) }
+
+    it { is_expected.to have_many(:members).through(:inbox_members).source(:user) }
+
+    it { is_expected.to have_many(:conversations).dependent(:destroy) }
+
+    it { is_expected.to have_many(:messages).through(:conversations) }
+  end
+
+  describe '#add_member' do
+    let(:inbox) { FactoryBot.create(:inbox) }
+    let(:user) { FactoryBot.create(:user) }
+
+    it do
+      expect(inbox.inbox_members.size).to eq(0)
+
+      inbox.add_member(user.id)
+      expect(inbox.reload.inbox_members.size).to eq(1)
+    end
+  end
+
+  describe '#remove_member' do
+    let(:inbox) { FactoryBot.create(:inbox) }
+    let(:user) { FactoryBot.create(:user) }
+
+    before { inbox.add_member(user.id) }
+
+    it do
+      expect(inbox.inbox_members.size).to eq(1)
+
+      inbox.remove_member(user.id)
+      expect(inbox.reload.inbox_members.size).to eq(0)
+    end
+  end
+
+  describe '#facebook?' do
+    let(:inbox) do
+      FactoryBot.build(:inbox, channel: channel_val)
+    end
+
+    context 'when the channel type is Channel::FacebookPage' do
+      let(:channel_val) { Channel::FacebookPage.new }
+
+      it do
+        expect(inbox.facebook?).to eq(true)
+      end
+    end
+
+    context 'when the channel type is not Channel::FacebookPage' do
+      let(:channel_val) { Channel::WebWidget.new }
+
+      it { expect(inbox.facebook?).to eq(false) }
+    end
+  end
+end