Chore: Routine Bugfixes and enhancements (#979)

- Fix slack scopes
- Docs for authentication
Fixes: #704 , #973

spec/lib/integrations/slack/send_on_slack_service_spec.rb

@@ -0,0 +1,31 @@
+require 'rails_helper'
+
+describe Integrations::Slack::SendOnSlackService do
+  let(:account) { create(:account) }
+  let!(:inbox) { create(:inbox, account: account) }
+  let!(:contact) { create(:contact) }
+
+  let!(:hook) { create(:integrations_hook, account: account) }
+  let!(:conversation) { create(:conversation, account: account, inbox: inbox, contact: contact) }
+  let!(:message) { create(:message, account: account, inbox: inbox, conversation: conversation) }
+
+  describe '#perform' do
+    it 'sent message to slack' do
+      builder = described_class.new(message: message, hook: hook)
+      stub_request(:post, 'https://slack.com/api/chat.postMessage')
+        .to_return(status: 200, body: '', headers: {})
+      slack_client = double
+      expect(builder).to receive(:slack_client).and_return(slack_client)
+
+      expect(slack_client).to receive(:chat_postMessage).with(
+        channel: hook.reference_id,
+        text: message.content,
+        username: "Contact: #{contact.name}",
+        thread_ts: conversation.identifier,
+        icon_url: anything
+      )
+
+      builder.perform
+    end
+  end
+end