test: add tests to check log filtering works

spec/services/filter_service_spec.rb

@@ -2,6 +2,7 @@ require "rails_helper"
 
 describe FilterService do
   describe "filter_by_search" do
+    context "when filtering organisations" do
       before do
         FactoryBot.create_list(:organisation, 5)
         FactoryBot.create(:organisation, name: "Acme LTD")
@@ -25,4 +26,57 @@ describe FilterService do
         end
       end
     end
+
+    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")
+        end
+
+        let(:lettings_log_list) { LettingsLog.all }
+
+        context "when given a postcode" do
+          let(:search_term) { "SW1 1AA" }
+
+          it "filters the collection on search term" do
+            expect(described_class.filter_by_search(lettings_log_list, search_term).count).to eq(1)
+          end
+        end
+
+        context "when not given a search term" do
+          let(:search_term) { nil }
+
+          it "does not filter the given collection" do
+            expect(described_class.filter_by_search(lettings_log_list, search_term).count).to eq(6)
+          end
+        end
+      end
+
+      context "when filtering sales logs" do
+        before do
+          FactoryBot.create_list(:sales_log, 5)
+          FactoryBot.create(:sales_log, purchid: "2")
+        end
+
+        let(:sales_log_list) { SalesLog.all }
+
+        context "when given a purchid" do
+          let(:search_term) { "2" }
+
+          it "filters the collection on search term" do
+            expect(described_class.filter_by_search(sales_log_list, search_term).count).to eq(1)
+          end
+        end
+
+        context "when not given a search term" do
+          let(:search_term) { nil }
+
+          it "does not filter the given collection" do
+            expect(described_class.filter_by_search(sales_log_list, search_term).count).to eq(6)
+          end
+        end
+      end
+    end
+  end
 end