Rubocop fixes (#3058)

app/helpers/articles_helper.rb

@@ -52,5 +52,4 @@ module ArticlesHelper
     host.gsub!("medium.com", "Medium") if host.include?("medium.com")
     host.start_with?("www.") ? host[4..-1] : host
   end
-
 end

app/liquid_tags/medium_tag.rb

@@ -33,4 +33,4 @@ class MediumTag < LiquidTagBase
   end
 end
 
-Liquid::Template.register_tag("medium", MediumTag)
+Liquid::Template.register_tag("medium", MediumTag)

app/models/chat_channel_membership.rb

@@ -62,7 +62,7 @@ class ChatChannelMembership < ApplicationRecord
 
   def channel_color
     if chat_channel.channel_type == "direct"
-      other_user&.decorate.darker_color
+      other_user&.decorate&.darker_color
     else
       "#111111"
     end

spec/models/article_spec.rb

@@ -311,13 +311,12 @@ RSpec.describe Article, type: :model do
     expect(article.has_frontmatter?).to eq(true)
   end
 
-  it "determines that an article has frontmatter" do
+  it "determines that an article doesn't have frontmatter" do
     body = "Hey hey Ho Ho"
     article.body_markdown = body
     expect(article.has_frontmatter?).to eq(false)
   end
 
-
   it "returns stripped canonical url" do
     article.canonical_url = " http://google.com "
     expect(article.decorate.processed_canonical_url).to eq("http://google.com")

spec/system/articles/user_visits_articles_by_tag_spec.rb

@@ -53,7 +53,7 @@ RSpec.describe "User visits articles by tag", type: :system do
     end
 
     context "when more articles" do
-      before do
+      it "visits ok" do
         create_list(:article, 3, tags: "javascript", user: author, published_at: Time.current)
         visit "/t/javascript"
       end

spec/system/homepage/user_visits_homepage_articles_spec.rb

@@ -4,7 +4,6 @@ RSpec.describe "User visits a homepage", type: :system do
   let!(:article) { create(:article, reactions_count: 12, featured: true) }
   let!(:article2) { create(:article, reactions_count: 20, featured: true) }
   let!(:bad_article) { create(:article, reactions_count: 0) }
-  let!(:user) { create(:user) }
   let!(:timestamp) { "2019-03-04T10:00:00Z" }
 
   context "when no options specified" do

spec/system/organization/user_views_an_organization_spec.rb

@@ -36,7 +36,7 @@ RSpec.describe "Organization index", type: :system do
     end
 
     context "when more articles" do
-      before do
+      it "visits ok" do
         create_list(:article, 3, organization: organization)
         visit "/#{organization.slug}"
       end