Ensure unique values in fabricators (#29515)

spec/fabrication/fabricators_spec.rb

@@ -6,9 +6,9 @@ Fabrication.manager.load_definitions if Fabrication.manager.empty?
 
 Fabrication.manager.schematics.map(&:first).each do |factory_name|
   describe "The #{factory_name} factory" do
-    it 'is valid' do
-      factory = Fabricate(factory_name)
-      expect(factory).to be_valid
+    it 'is able to create valid records' do
+      records = Fabricate.times(2, factory_name) # Create multiple of each to uncover uniqueness issues
+      expect(records).to all(be_valid)
     end
   end
 end