Added config to optionally disable deleting digitals on variant deletion

spec/models/variant_spec.rb

@@ -11,19 +11,26 @@ describe Spree::Variant do
     let(:digital) { @digital }
 
     it "should destroy associated digitals by default" do
+      # default is false
+      Spree::DigitalConfiguration[:keep_digitals] = false
+
       Spree::Digital.count.should == 1
       variant.digitals.present?.should be_true
-      variant.destroy
+      variant.deleted_at = Time.now
+      variant.deleted?.should be_true
+      variant.save!
       expect { digital.reload.present? }.to raise_error
       Spree::Digital.count.should == 0
     end
 
     it "should conditionally keep associated digitals" do
       Spree::DigitalConfiguration[:keep_digitals] = true
-      
+
       Spree::Digital.count.should == 1
-      variant.digitals.present?.should be_false
-      variant.destroy
+      variant.digitals.present?.should be_true
+      variant.deleted_at = Time.now
+      variant.save!
+      variant.deleted?.should be_true
       expect { digital.reload.present? }.to_not raise_error
       Spree::Digital.count.should == 1
     end