Add internal YARD doc for public interface

Aid developer in future work with this mega class.

app/services/audit_event_service.rb

 # frozen_string_literal: true
 
 class AuditEventService
+  # Instantiates a new service
+  #
+  # @param author [User] the user who authors the change
+  # @param entity [Object] an instance of either Project/Group/User type. This
+  #   param is also used to determine at which level the audit events are
+  #   shown.
+  #   - Project: events are visible at Project level
+  #   - Group: events are visible at Group level
+  #   - User: events are visible at Instance level
+  # @param details [Hash] details to be added to audit event
+  #
+  # @return [AuditEventService]
   def initialize(author, entity, details = {})
-    @author, @entity, @details = author, entity, details
+    @author = author
+    @entity = entity
+    @details = details
   end
 
+  # Builds the @details attribute for authentication
+  #
+  # This uses the @author as the target object being changed
+  #
+  # @return [AuditEventService]
   def for_authentication
     @details = {
       with: @details[:with],
@@ -16,11 +35,15 @@ class AuditEventService
     self
   end
 
+  # Writes event to a file and creates an event record in DB
+  #
+  # @return [SecurityEvent] persited if saves and non-persisted if fails
   def security_event
     log_security_event_to_file
     log_security_event_to_database
   end
 
+  # Writes event to a file
   def log_security_event_to_file
     file_logger.info(base_payload.merge(formatted_details))
   end

ee/app/services/ee/audit_event_service.rb

@@ -4,6 +4,11 @@ module EE
   module AuditEventService
     extend ::Gitlab::Utils::Override
     # rubocop:disable Gitlab/ModuleWithInstanceVariables
+
+    # Builds the @details attribute for member
+    #
+    # @param member [Member] the member whom is changed
+    # @return [AuditEventService]
     def for_member(member)
       action = @details[:action]
       old_access_level = @details[:old_access_level]
@@ -56,6 +61,14 @@ module EE
       self
     end
 
+    # Builds the @details attribute for project group link
+    #
+    # This expects [String] :action of :destroy, :create, :update to be
+    #   specified in @details attribute
+    #
+    # @param group_link [ProjectGroupLink] the project group link being changed
+    #
+    # @return [AuditEventService]
     def for_project_group_link(group_link)
       @details = custom_project_link_group_attributes(group_link)
                  .merge(author_name: @author.name,
@@ -66,6 +79,9 @@ module EE
       self
     end
 
+    # Builds the @details attribute for a failed login
+    #
+    # @return [AuditEventService]
     def for_failed_login
       ip = @details[:ip_address]
       auth = @details[:with] || 'STANDARD'
@@ -80,6 +96,9 @@ module EE
       self
     end
 
+    # Builds the @details attribute for changes
+    #
+    # @return [AuditEventService]
     def for_changes
       @details =
         {
@@ -91,9 +110,11 @@ module EE
           target_type: @entity.class.name,
           target_details: @details[:target_details] || @entity.name
         }
+
       self
     end
 
+    # Write event to file and create an event record in DB
     def security_event
       prepare_security_event
 
@@ -106,6 +127,10 @@ module EE
       end
     end
 
+    # Creates an event record in DB
+    #
+    # @return [nil] if audit events is not enabled
+    # @return [SecurityEvent] if record is persisted
     def unauth_security_event
       return unless audit_events_enabled?
 
@@ -120,14 +145,33 @@ module EE
       )
     end
 
+    # Builds the @details attribute for user
+    #
+    # This uses the [User] @entity as the target object being changed
+    #
+    # @param full_path [String] required if it is different from the User model
+    #   in @entity. This is for backward compatability and this parameter will
+    #   be dropped after all of these incorrect usages are removed.
+    #
+    # @return [AuditEventService]
     def for_user(full_path = @entity.full_path)
       for_custom_model('user', full_path)
     end
 
+    # Builds the @details attribute for project
+    #
+    # This uses the [Project] @entity as the target object being changed
+    #
+    # @return [AuditEventService]
     def for_project
       for_custom_model('project', @entity.full_path)
     end
 
+    # Builds the @details attribute for group
+    #
+    # This uses the [Group] @entity as the target object being changed
+    #
+    # @return [AuditEventService]
     def for_group
       for_custom_model('group', @entity.full_path)
     end

ee/spec/services/ee/audit_events/protected_branch_audit_event_service_spec.rb

@@ -68,30 +68,4 @@ describe EE::AuditEvents::ProtectedBranchAuditEventService do
       end
     end
   end
-
-  describe '#enabled?' do
-    let(:service) { described_class.new(author, protected_branch, :any) }
-
-    subject { service.enabled? }
-
-    context 'when not licensed' do
-      before do
-        stub_licensed_features(audit_events: false,
-                               extended_audit_events: false,
-                               admin_audit_log: false)
-      end
-
-      it { is_expected.to be(false) }
-    end
-
-    context 'when licensed' do
-      before do
-        stub_licensed_features(audit_events: true,
-                               extended_audit_events: false,
-                               admin_audit_log: false)
-      end
-
-      it { is_expected.to be(true) }
-    end
-  end
 end