require_relative '../lib/inline_svg' describe InlineSvg::WebpackAssetFinder do context "when the file is not found" do it "returns nil" do stub_const('Rails', double('Rails').as_null_object) stub_const('Webpacker', double('Webpacker').as_null_object) expect(::Webpacker.manifest).to receive(:lookup).with('some-file').and_return(nil) expect(described_class.find_asset('some-file').pathname).to be_nil end end end