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Apply suggestion to spec/support/shared_examples/requests/api/graphql/mutations/snippets_shared_examples.rb

app/graphql/mutations/snippets/base.rb

@@ -15,6 +15,8 @@ module Mutations
       end
 
       def authorized_resource?(snippet)
+        return false if snippet.nil?
+
         Ability.allowed?(context[:current_user], ability_for(snippet), snippet)
       end
 

changelogs/unreleased/sk-fix-500-on-snippet-graphql-mutations.yml

+---
+title: Fix 500 error for non-existing snippet on graphql mutations
+merge_request: 30632
+author: Sashi Kumar
+type: fixed

spec/requests/api/graphql/mutations/snippets/destroy_spec.rb

@@ -6,9 +6,10 @@ describe 'Destroying a Snippet' do
   include GraphqlHelpers
 
   let(:current_user) { snippet.author }
+  let(:snippet_gid) { snippet.to_global_id.to_s }
   let(:mutation) do
     variables = {
-      id: snippet.to_global_id.to_s
+      id: snippet_gid
     }
 
     graphql_mutation(:destroy_snippet, variables)
@@ -49,9 +50,11 @@ describe 'Destroying a Snippet' do
   end
 
   describe 'PersonalSnippet' do
-    it_behaves_like 'graphql delete actions' do
     let_it_be(:snippet) { create(:personal_snippet) }
-    end
+
+    it_behaves_like 'graphql delete actions'
+
+    it_behaves_like 'when the snippet is not found'
   end
 
   describe 'ProjectSnippet' do
@@ -85,5 +88,7 @@ describe 'Destroying a Snippet' do
         end
       end
     end
+
+    it_behaves_like 'when the snippet is not found'
   end
 end

spec/requests/api/graphql/mutations/snippets/mark_as_spam_spec.rb

@@ -10,9 +10,11 @@ describe 'Mark snippet as spam', :do_not_mock_admin_mode do
   let_it_be(:snippet) { create(:personal_snippet) }
   let_it_be(:user_agent_detail) { create(:user_agent_detail, subject: snippet) }
   let(:current_user) { snippet.author }
+
+  let(:snippet_gid) { snippet.to_global_id.to_s }
   let(:mutation) do
     variables = {
-      id: snippet.to_global_id.to_s
+      id: snippet_gid
     }
 
     graphql_mutation(:mark_as_spam_snippet, variables)
@@ -30,6 +32,8 @@ describe 'Mark snippet as spam', :do_not_mock_admin_mode do
     end
   end
 
+  it_behaves_like 'when the snippet is not found'
+
   context 'when the user does not have permission' do
     let(:current_user) { other_user }
 

spec/requests/api/graphql/mutations/snippets/update_spec.rb

@@ -15,9 +15,10 @@ describe 'Updating a Snippet' do
   let(:updated_file_name) { 'Updated file_name' }
   let(:current_user) { snippet.author }
 
+  let(:snippet_gid) { GitlabSchema.id_from_object(snippet).to_s }
   let(:mutation) do
     variables = {
-      id: GitlabSchema.id_from_object(snippet).to_s,
+      id: snippet_gid,
       content: updated_content,
       description: updated_description,
       visibility_level: 'public',
@@ -90,7 +91,6 @@ describe 'Updating a Snippet' do
   end
 
   describe 'PersonalSnippet' do
-    it_behaves_like 'graphql update actions' do
     let(:snippet) do
       create(:personal_snippet,
              :private,
@@ -99,7 +99,10 @@ describe 'Updating a Snippet' do
              content: original_content,
              description: original_description)
     end
-    end
+
+    it_behaves_like 'graphql update actions'
+
+    it_behaves_like 'when the snippet is not found'
   end
 
   describe 'ProjectSnippet' do
@@ -142,5 +145,7 @@ describe 'Updating a Snippet' do
         end
       end
     end
+
+    it_behaves_like 'when the snippet is not found'
   end
 end

spec/support/shared_examples/requests/api/graphql/mutations/snippets_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'when the snippet is not found' do
+  let(:snippet_gid) do
+    "gid://gitlab/#{snippet.class.name}/#{non_existing_record_id}"
+  end
+
+  it_behaves_like 'a mutation that returns top-level errors',
+                  errors: [Gitlab::Graphql::Authorize::AuthorizeResource::RESOURCE_ACCESS_ERROR]
+end