Add failing feature spec for stock location bug

Before we fix this bug, we should reproduce it in a feature spec.

Co-authored-by: An Stewart <[email protected]>
Co-authored-by: Adam Mueller <[email protected]>
(cherry picked from commit 2409038)

backend/spec/features/admin/stock_items_spec.rb

@@ -6,8 +6,10 @@
   stub_authorization!
 
   let(:admin_user)   { create(:admin_user) }
-  let!(:variant_1) { create(:variant) }
-  let!(:variant_2) { create(:variant) }
+  let!(:variant_1) { create(:variant, product: product1) }
+  let!(:variant_2) { create(:variant, product: product2) }
+  let(:product1) { create(:product, name: 'Ruby Shirt') }
+  let(:product2) { create(:product, name: 'Solidus Shirt') }
   let!(:stock_location) { create(:stock_location_without_variant_propagation) }
 
   scenario 'User can add a new stock locations to any variant' do
@@ -19,4 +21,12 @@
     end
     expect(page).to have_content("Created successfully")
   end
+
+  scenario 'searching by variant' do
+    visit spree.admin_stock_items_path
+    fill_in 'SKU or Option Value', with: 'Ruby'
+    click_on 'Filter Results'
+    expect(page).to have_content "Ruby Shirt"
+    expect(page).to_not have_content "Solidus Shirt"
+  end
 end