[fixup!] Fix variant processor

Ref. #22 (comment)

lib/solidus_importer/processors/variant.rb

@@ -15,14 +15,14 @@ def call(context)
       private
 
       def prepare_variant
+        return product.master if master_variant?
+
         @prepare_variant ||= Spree::Variant.find_or_initialize_by(sku: sku) do |variant|
           variant.product = product
         end
       end
 
       def process_variant
-        return product.master if master_variant?
-
         prepare_variant.tap do |variant|
           # Apply the row attributes
           variant.weight = @data['Variant Weight'] unless @data['Variant Weight'].nil?

spec/lib/solidus_importer/processors/variant_spec.rb

@@ -23,7 +23,7 @@
         { data: data, product: product }
       end
       let(:data) { build(:solidus_importer_row_variant, :with_import).data }
-      let(:product) { build_stubbed(:product, slug: data['Handle']) }
+      let(:product) { create(:product, slug: data['Handle']) }
 
       before do
         allow(product).to receive(:touch)
@@ -38,6 +38,7 @@
         it 'creates a new variant' do
           expect { described_method }.to change { Spree::Variant.count }.by(1)
           expect(described_method).to eq(result)
+          expect(result[:variant].weight).to eq 20.0
         end
       end
 
@@ -49,6 +50,7 @@
         it 'updates master variant' do
           expect { described_method }.not_to(change { Spree::Variant.count })
           expect(described_method).to eq(result)
+          expect(result[:variant].weight).to eq 20.0
         end
       end
 
@@ -60,6 +62,7 @@
         it 'updates master variant' do
           expect { described_method }.not_to(change { Spree::Variant.count })
           expect(described_method).to eq(result)
+          expect(result[:variant].weight).to eq 20.0
         end
       end