[Feature] Email collect message hooks (#331)

- Add email collect hook on creating conversation
- Merge contact if it already exist

spec/models/message_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Message, type: :model do
+  context 'with validations' do
+    it { is_expected.to validate_presence_of(:inbox_id) }
+    it { is_expected.to validate_presence_of(:conversation_id) }
+    it { is_expected.to validate_presence_of(:account_id) }
+  end
+
+  context 'when message is created' do
+    let(:message) { build(:message) }
+
+    it 'triggers ::MessageTemplates::HookExecutionService' do
+      hook_execution_service = double
+      allow(::MessageTemplates::HookExecutionService).to receive(:new).and_return(hook_execution_service)
+      allow(hook_execution_service).to receive(:perform).and_return(true)
+
+      message.save!
+
+      expect(::MessageTemplates::HookExecutionService).to have_received(:new).with(message: message)
+      expect(hook_execution_service).to have_received(:perform)
+    end
+  end
+end