Add A/B/n test for interventions

lib/user_group_separator.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class UserGroupSeparator
+  # Different user groups for the Java21 course based on the user_id
+  # 0: show_tips_intervention && no_b
+  # 1: show_break_intervention && no_b
+  # 2: show_rfc_intervention && no_b
+  # 3: show_tips_intervention && show_b
+  # 4: show_break_intervention && show_b
+  # 5: show_rfc_intervention && show_b
+
+  # separates user into 33% tips interventions, 33% break intervention, 33% rfc intervention
+  def self.get_intervention_group(user_id)
+    user_group = user_id % 6 # => 0, 1, 2, 3, 4, 5
+    case user_group
+      when 0, 3
+        :show_tips_intervention
+      when 1, 4
+        :show_break_intervention
+      else # 2, 5
+        :show_rfc_intervention
+    end
+  end
+
+  # separates user into 50% with Community Solution, 50% without Community Solution
+  def self.get_community_solution_group(user_id)
+    user_group = user_id % 6 # => 0, 1, 2, 3, 4, 5
+    case user_group
+      when 0, 1, 2
+        :show_community_solution
+      else # 3, 4, 5
+        :no_community_solution
+    end
+  end
+end