Filter on the subset of logs in tests (#1430)

spec/services/filter_service_spec.rb

@@ -29,13 +29,12 @@ describe FilterService do
 
     context "when filtering logs" do
       context "when filtering lettings logs" do
-        before do
-          FactoryBot.create_list(:lettings_log, 5)
-          FactoryBot.create(:lettings_log, postcode_full: "SW1 1AA")
+        let(:lettings_log_list) do
+          logs = FactoryBot.create_list(:lettings_log, 5)
+          searched_log = FactoryBot.create(:lettings_log, postcode_full: "SW1 1AA")
+          LettingsLog.where(id: [searched_log.id] + logs.map(&:id))
         end
 
-        let(:lettings_log_list) { LettingsLog.all }
-
         context "when given a postcode" do
           let(:search_term) { "SW1 1AA" }
 
@@ -54,13 +53,12 @@ describe FilterService do
       end
 
       context "when filtering sales logs" do
-        before do
-          FactoryBot.create_list(:sales_log, 5)
-          FactoryBot.create(:sales_log, purchid: "2")
+        let(:sales_log_list) do
+          logs = FactoryBot.create_list(:sales_log, 5)
+          searched_log = FactoryBot.create(:sales_log, purchid: "2")
+          SalesLog.where(id: [searched_log.id] + logs.map(&:id))
         end
 
-        let(:sales_log_list) { SalesLog.all }
-
         context "when given a purchid" do
           let(:search_term) { "2" }