Issue #87 Add some SlackNotificationService tests and gral Rubocop warnings cleanup

app/services/pull_request.rb

@@ -4,7 +4,7 @@ class PullRequest
               :url, :body, :language, :repo_name
 
   def initialize(params)
-    @info = params.dig(:pull_request)
+    @info = params.fetch(:pull_request, {})
     @username = @info.dig(:user, :login)
     @avatar_url = @info.dig(:user, :avatar_url)
     @webhook_label = params.dig(:github_webhook, :label, :name)

app/services/slack_notification_service.rb

@@ -24,8 +24,10 @@ class SlackNotificationService
   attr_reader :action, :extra_params, :slack_bot, :pr
 
   def initialize(params)
-    @action = params[:github_webhook][:action]
-    @extra_params = params
+    @action = params.dig(:github_webhook, :action)
+    raise(ArgumentError, 'No action param set') unless @action
+
+    @extra_params = params || {}
     @slack_bot = SlackBot.new(channel: channel(params))
     @pr = PullRequest.new(params)
   end
@@ -56,7 +58,7 @@ def filter_on_hold_labeled_action
 
   def channel(params)
     lang = LANGUAGES[params.dig(:repository, :language)&.to_sym]
-    repository_info = params.dig(:repository)
+    repository_info = params[:repository]
     channel = "##{build_channel(lang, repository_info)}"
 
     if search_channel(channel)
@@ -68,7 +70,7 @@ def channel(params)
 
   def search_channel(channel)
     Slack::Web::Client.new.conversations_info(channel: channel)
-  rescue Exception => e
+  rescue StandardError => e
     Rails.logger.error("Error #{e.inspect} for channel #{channel}")
     nil
   end
@@ -110,11 +112,11 @@ def filter_merged_action
     slack_bot.add_merge_emoji matches
   end
 
-  def js_channels(pr, lang)
-    return unless pr[:name]
+  def js_channels(pull_request, _lang)
+    return unless pull_request[:name]
 
-    repo_name = pr[:name].downcase
-    topics = pr[:topics].present? ? pr[:topics] : []
+    repo_name = pull_request[:name].downcase
+    topics = pull_request[:topics].present? ? pull_request[:topics] : []
 
     js_repo_name(repo_name, topics)
   end

spec/requests/api/v1/github_webhook/filter_spec.rb

@@ -278,7 +278,7 @@ def expect_not_notification
 end
 
 def mock_channel_response(return_value)
-  allow_any_instance_of(SlackNotificationService).to receive(:search_channel)
-  .and_return(return_value)
+  allow_any_instance_of(SlackNotificationService)
+    .to receive(:search_channel)
+    .and_return(return_value)
 end
-

spec/services/slack_notification_service_spec.rb

@@ -0,0 +1,74 @@
+require 'rails_helper'
+
+describe SlackNotificationService do
+  describe 'initialization' do
+    subject { described_class.new({}) }
+
+    it 'raise an error if no action is set in params' do
+      expect { subject }.to raise_error(ArgumentError)
+    end
+  end
+
+  describe '#send_notification' do
+    subject { described_class.new(params).send_notification }
+
+    let(:username) { Faker::Internet.username }
+    let!(:user) do
+      User.create(github_name: username, blacklisted: false)
+    end
+
+    context 'with valid params' do
+      let(:random_action) { described_class::ACTION_METHODS.keys.sample }
+      let(:channel_name) { described_class::DEFAULT_CHANNEL }
+      let(:some_language) { 'Node' }
+      let(:params) do
+        {
+          github_webhook: {
+            action: random_action,
+            label: { name: Faker::Internet.slug(words: '_') }
+          },
+          channel: channel_name,
+          pull_request: {
+            user: { login: username },
+            body: Faker::Lorem.sentence
+          },
+          repository: {
+            name: Faker::Internet.slug,
+            language: some_language
+          }
+        }
+      end
+
+      before do
+        stub_request(:post, 'https://slack.com/api/conversations.list')
+          .to_return(status: 200, body: '', headers: {})
+
+        stub_request(:post, 'https://slack.com/api/chat.postMessage')
+          .with(
+            body: {
+              'channel': channel_name,
+              'text': '  :nodejs:',
+              'username': username
+            }
+          ).to_return(status: 200, body: '', headers: {})
+      end
+
+      it 'sends the message' do
+        expect_any_instance_of(described_class)
+          .to receive(:send)
+          .with(described_class::ACTION_METHODS[random_action])
+          .and_call_original
+        subject
+      end
+
+      context 'with a PR from a blacklisted user' do
+        let!(:user) { User.create(github_name: username, blacklisted: true) }
+
+        it 'does NOT send the message' do
+          expect_any_instance_of(described_class).not_to receive(:send)
+          subject
+        end
+      end
+    end
+  end
+end