SCIM pagination startIndex handles string input

Adds tests and splits a method to simplify testing

ee/app/models/concerns/scim_paginatable.rb

@@ -5,10 +5,16 @@ module ScimPaginatable
 
   class_methods do
     def scim_paginate(start_index:, count:)
-      one_based_index = [start_index.presence || 1, 1].max
+      one_based_index = [start_index.to_i, 1].max
       zero_based_index = one_based_index - 1
 
-      offset(zero_based_index).limit(count)
+      scim_paginate_with_offset_and_limit(offset: zero_based_index, limit: count.to_i)
+    end
+
+    private
+
+    def scim_paginate_with_offset_and_limit(offset:, limit:)
+      offset(offset).limit(limit)
     end
   end
 end

ee/changelogs/unreleased/jej-fix-scim-pagination-integer-handling.yml

+---
+title: SCIM pagination startIndex handles string input
+merge_request: 19331
+author:
+type: fixed

ee/spec/lib/ee/api/helpers/scim_pagination_spec.rb

@@ -59,7 +59,7 @@ describe ::EE::API::Helpers::ScimPagination do
       end
 
       it 'uses a 1-based index' do
-        query = { startIndex: 1 }
+        query = { startIndex: '1' }
 
         result = pagination_class.new(query).scim_paginate(resource)
 

ee/spec/models/concerns/scim_paginatable_spec.rb

@@ -16,9 +16,21 @@ describe ScimPaginatable do
     end
 
     it 'translates a 1-based index to an offset of 0' do
-      expect(paginatable_class).to receive(:offset).with(0).and_return(double(limit: double))
+      expect(paginatable_class).to receive(:scim_paginate_with_offset_and_limit).with(offset: 0, limit: count)
 
-      paginatable_class.scim_paginate(start_index: start_index, count: count)
+      paginatable_class.scim_paginate(start_index: 1, count: count)
+    end
+
+    it 'handles string input' do
+      expect(paginatable_class).to receive(:scim_paginate_with_offset_and_limit).with(offset: start_index - 1, limit: count)
+
+      paginatable_class.scim_paginate(start_index: start_index.to_s, count: count.to_s)
+    end
+
+    it 'defaults to offset of 0' do
+      expect(paginatable_class).to receive(:scim_paginate_with_offset_and_limit).with(offset: 0, limit: count)
+
+      paginatable_class.scim_paginate(start_index: '', count: count)
     end
   end
 end