refactor `app/helpers/projects_helper.rb:21:3`

.rubocop.yml

@@ -643,7 +643,7 @@ Metrics/ClassLength:
 # of test cases needed to validate a method.
 Metrics/CyclomaticComplexity:
   Enabled: true
-  Max: 15
+  Max: 14
 
 # Limit lines to 80 characters.
 Metrics/LineLength:

app/helpers/projects_helper.rb

@@ -17,7 +17,7 @@ module ProjectsHelper
   def link_to_member_avatar(author, opts = {})
     default_opts = { avatar: true, name: true, size: 16, author_class: 'author', title: ":name" }
     opts = default_opts.merge(opts)
-    image_tag(avatar_icon(author, opts[:size]), width: opts[:size], class: "avatar avatar-inline #{"s#{opts[:size]}" if opts[:size]}", alt: '') if opts[:avatar]
+    image_tag(avatar_icon(author, opts[:size]), width: opts[:size], class: ['avatar', 'avatar-inline', "#{"s#{opts[:size]}" if opts[:size]}", opts[:avatar_class]].reject(&:blank?), alt: '') if opts[:avatar]
   end
 
   def link_to_member(project, author, opts = {}, &block)
@@ -29,7 +29,7 @@ module ProjectsHelper
     author_html = ""
 
     # Build avatar image tag
-    author_html << image_tag(avatar_icon(author, opts[:size]), width: opts[:size], class: "avatar avatar-inline #{"s#{opts[:size]}" if opts[:size]} #{opts[:avatar_class] if opts[:avatar_class]}", alt: '') if opts[:avatar]
+    author_html << link_to_member_avatar(author, opts) if opts[:avatar]
 
     # Build name span tag
     if opts[:by_username]

spec/helpers/projects_helper_spec.rb

@@ -191,7 +191,15 @@ describe ProjectsHelper do
     end
   end
 
-  describe 'link_to_member' do
+  describe '#link_to_member_avatar' do
+    let(:user) { create(:user) }
+
+    it 'returns image tag for member avatar' do
+      expect(helper.link_to_member_avatar(user)).to eq("<img width=\"16\" class=\"avatar avatar-inline s16  lazy\" alt=\"\" data-src=\"http://www.gravatar.com/avatar/a763e4acc6bc22cbabeae2638cfd4db4?s=32&amp;d=identicon\" src=\"data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" />")
+    end
+  end
+
+  describe '#link_to_member' do
     let(:group)   { create(:group) }
     let(:project) { create(:project, group: group) }
     let(:user)    { create(:user) }