feat: add inference for 24/25 and test

app/models/derived_variables/lettings_log_variables.rb

@@ -91,8 +91,9 @@ module DerivedVariables::LettingsLogVariables
         self.prevten = 30 if owning_organisation&.provider_type == "LA"
       end
     end
-    if form.start_year_after_2024? && is_bedsit?
-      self.beds = 1
+    if form.start_year_after_2024?
+      self.beds = 1 if is_bedsit?
+      self.preg_occ = 2 if preg_occ.nil? && hhmemb.present? && (all_male_household? || no_women_or_non_binary_between_11_and_60?)
     end
 
     child_under_16_constraints!

app/models/lettings_log.rb

@@ -664,6 +664,21 @@ class LettingsLog < Log
     LettingsLog.where.not(duplicate_set_id: nil).where(duplicate_set_id:).where.not(id:)
   end
 
+  def all_male_household?
+    (1..hhmemb).all? do |n|
+      public_send("sex#{n}") == "M"
+    end
+  end
+
+  def no_women_or_non_binary_between_11_and_60?
+    (1..hhmemb).none? do |n|
+      sex = public_send("sex#{n}")
+      age = public_send("age#{n}")
+
+      %w[F X].include?(sex) && age.present? && age.between?(11, 60)
+    end
+  end
+
 private
 
   def reset_invalid_unresolved_log_fields!

spec/models/lettings_log_spec.rb

@@ -2367,6 +2367,57 @@ RSpec.describe LettingsLog do
         expect { lettings_log.update!(nationality_all_group: nil, declaration: 1) }.not_to change(lettings_log, :nationality_all)
       end
     end
+
+    context "when inferring pregnancy" do
+      around do |example|
+        Timecop.freeze(now) do
+          Singleton.__init__(FormHandler)
+          example.run
+        end
+      end
+
+      context "when before 2024/25" do
+        let(:now) { Time.zone.local(2024, 1, 1) }
+        let!(:lettings_log) { create(:lettings_log, :setup_completed, startdate: now, preg_occ: nil, declaration: 1, hhmemb: 3) }
+
+        it "does not infer pregnancy for all male households" do
+          lettings_log.update!(sex1: "M", sex2: "M", sex3: "M")
+          expect(lettings_log.preg_occ).to be_nil
+        end
+
+        it "does not infer pregnancy when no woman or non-binary person in the household is 11 to 60" do
+          lettings_log.update!(sex1: "F", sex2: "X", sex3: "M", age1: 61, age2: 10, age3: 55)
+          expect(lettings_log.preg_occ).to be_nil
+        end
+      end
+
+      context "when in 2024/25" do
+        let(:now) { Time.zone.local(2024, 5, 1) }
+        let!(:lettings_log) { create(:lettings_log, :setup_completed, startdate: now, preg_occ: nil, declaration: 1, hhmemb: 3) }
+
+        it "infers no pregnancy for all male households" do
+          lettings_log.update!(sex1: "M", sex2: "M", sex3: "M")
+          expect(lettings_log.preg_occ).to eq(2)
+        end
+
+        it "infers no pregnancy when no woman or non-binary person in the household is 11 to 60" do
+          lettings_log.update!(sex1: "F", sex2: "X", sex3: "M", age1: 61, age2: 10, age3: 55)
+          expect(lettings_log.preg_occ).to eq(2)
+        end
+
+        it "does not override user entered data when household is all male" do
+          lettings_log.update!(preg_occ: 1)
+          lettings_log.update!(sex1: "M", sex2: "M", sex3: "M")
+          expect(lettings_log.preg_occ).to eq(1)
+        end
+
+        it "does not override user entered data when no woman or non-binary person in the household is 11 to 60" do
+          lettings_log.update!(preg_occ: 1)
+          lettings_log.update!(sex1: "F", sex2: "X", sex3: "M", age1: 61, age2: 10, age3: 55)
+          expect(lettings_log.preg_occ).to eq(1)
+        end
+      end
+    end
   end
 
   describe "optional fields" do