add test; fix styles

app/services/credit_notes/generate_service.rb

@@ -27,8 +27,7 @@ def call
     def generate_pdf(credit_note)
       I18n.locale = credit_note.customer.preferred_document_locale
 
-      pdf_service = Utils::PdfGenerator.new(template: , context: credit_note)
-      pdf_result = pdf_service.call
+      pdf_result = Utils::PdfGenerator.call(template: , context: credit_note)
 
       credit_note.file.attach(
         io: pdf_result.io,

app/views/templates/credit_notes/credit_note.slim

@@ -6,7 +6,7 @@ html
     meta name='viewport' content='width=device-width, initial-scale=1.0'
     title Credit note
   body
-     = SlimHelper.render('templates/credit_notes/_styles', self)
+    == SlimHelper.render('templates/credit_notes/_styles', self)
 
     .wrapper
       .mb-24

app/views/templates/credit_notes/self_billed.slim

@@ -6,7 +6,7 @@ html
     meta name='viewport' content='width=device-width, initial-scale=1.0'
     title Self billing credit note
   body
-    = SlimHelper.render('templates/credit_notes/_styles', self)
+    == SlimHelper.render('templates/credit_notes/_styles', self)
 
     .wrapper
       .mb-24

spec/services/credit_notes/generate_service_spec.rb

@@ -11,7 +11,6 @@
   let(:credit_note) { create(:credit_note, invoice:, customer:) }
   let(:fee) { create(:fee, invoice:) }
   let(:credit_note_item) { create(:credit_note_item, credit_note:, fee:) }
-  let(:pdf_generator) { instance_double(Utils::PdfGenerator) }
   let(:context) { nil }
 
   let(:pdf_content) do
@@ -25,9 +24,7 @@
   before do
     credit_note_item
 
-    allow(Utils::PdfGenerator).to receive(:new)
-      .and_return(pdf_generator)
-    allow(pdf_generator).to receive(:call)
+    allow(Utils::PdfGenerator).to receive(:call)
       .and_return(pdf_response)
   end
 
@@ -38,6 +35,23 @@
       expect(result.credit_note.file).to be_present
     end
 
+    it 'uses credit_note template' do
+      credit_note_generate_service.call
+
+      expect(Utils::PdfGenerator).to have_received(:call).with(template: 'credit_notes/credit_note', context: credit_note)
+    end
+
+    context "when credit note is for self billed invoice" do
+      let(:invoice) { create(:invoice, :self_billed, customer:, organization:) }
+      let(:credit_note) { create(:credit_note, invoice:, customer:) }
+
+      it 'uses self billed template' do
+        credit_note_generate_service.call
+
+        expect(Utils::PdfGenerator).to have_received(:call).with(template: 'credit_notes/self_billed', context: credit_note)
+      end
+    end
+
     context 'with preferred locale' do
       before { customer.update!(document_locale: 'fr') }