Return empty results rather than raising errors

spec/graphql/resolvers/snippets/blobs_resolver_spec.rb

@@ -16,16 +16,18 @@ RSpec.describe Resolvers::Snippets::BlobsResolver do
     context 'when user is not authorized' do
       let(:other_user) { create(:user) }
 
-      it 'raises an error' do
-        expect do
-          resolve_blobs(snippet, user: other_user)
-        end.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+      it 'redacts the field' do
+        expect(resolve_blobs(snippet, user: other_user)).to be_nil
       end
     end
 
     context 'when using no filter' do
       it 'returns all snippet blobs' do
-        expect(resolve_blobs(snippet).map(&:path)).to contain_exactly(*snippet.list_files)
+        result = resolve_blobs(snippet, args: {})
+
+        expect(result).to match_array(snippet.list_files.map do |file|
+          have_attributes(path: file)
+        end)
       end
     end
 
@@ -34,7 +36,13 @@ RSpec.describe Resolvers::Snippets::BlobsResolver do
         it 'returns an array of files' do
           path = 'CHANGELOG'
 
-          expect(resolve_blobs(snippet, args: { paths: path }).first.path).to eq(path)
+          expect(resolve_blobs(snippet, paths: [path])).to contain_exactly(have_attributes(path: path))
+        end
+      end
+
+      context 'the argument does not match anything' do
+        it 'returns an empty result' do
+          expect(resolve_blobs(snippet, paths: ['does not exist'])).to be_empty
         end
       end
 
@@ -42,13 +50,15 @@ RSpec.describe Resolvers::Snippets::BlobsResolver do
         it 'returns an array of files' do
           paths = ['CHANGELOG', 'README.md']
 
-          expect(resolve_blobs(snippet, args: { paths: paths }).map(&:path)).to contain_exactly(*paths)
+          expect(resolve_blobs(snippet, paths: paths)).to match_array(paths.map do |file|
+            have_attributes(path: file)
+          end)
         end
       end
     end
   end
 
-  def resolve_blobs(snippet, user: current_user, args: {})
+  def resolve_blobs(snippet, user: current_user, paths: [], args: { paths: paths })
     resolve(described_class, args: args, ctx: { current_user: user }, obj: snippet)
   end
 end