Add bugfix and test for LCSH from TCO-90

app/models/detector/lcsh.rb

@@ -28,7 +28,8 @@ def self.record(term)
       results.identifiers.each_key do
         Detection.find_or_create_by(
           term:,
-          detector: Detector.where(name: 'LCSH').first
+          detector: Detector.where(name: 'LCSH').first,
+          detector_version: ENV.fetch('DETECTOR_VERSION', 'unset')
         )
       end
 

test/models/detector/lcsh_test.rb

@@ -49,5 +49,24 @@ class LcshTest < ActiveSupport::TestCase
 
       assert_equal(detection_count, Detection.count)
     end
+
+    test 'record respects changes to the DETECTOR_VERSION value' do
+      # Create a relevant detection
+      Detector::Lcsh.record(terms('lcsh'))
+
+      detection_count = Detection.count
+
+      # Calling the record method again doesn't do anything, but does not error.
+      Detector::Lcsh.record(terms('lcsh'))
+
+      assert_equal(detection_count, Detection.count)
+
+      # Calling the record method after DETECTOR_VERSION is incremented results in a new Detection
+      ClimateControl.modify DETECTOR_VERSION: 'updated' do
+        Detector::Lcsh.record(terms('lcsh'))
+
+        assert_equal detection_count + 1, Detection.count
+      end
+    end
   end
 end