GraphQL - HelpMeTest

GraphQL

Testing GraphQL Persisted Queries and Automatic Persisted Queries (APQ)

GraphQL persisted queries reduce payload size and improve security by replacing full query strings with short hash identifiers. But they introduce new failure modes — hash mismatches, cache invalidation bugs, and APQ negotiation failures — that require dedicated testing strategies. This guide covers everything you need to test persisted queries and APQ

GraphQL

Testing GraphQL Error Handling: Partial Responses, Null Propagation & Error Extensions

GraphQL error handling is fundamentally different from REST. A 200 response can contain errors. A query can partially succeed — returning some data while failing on other fields. Null propagation can silently wipe out entire subtrees. If you're only testing the happy path, you're missing half the

Database Testing

Nhost Testing Guide: Testing Hasura + Auth + Storage

Nhost is an open-source Firebase alternative that combines PostgreSQL, Hasura GraphQL Engine, Auth (JWT-based), Storage, and serverless functions into a single deployable platform. It's popular with teams who want typed GraphQL APIs auto-generated from their database schema without writing resolvers. Testing Nhost applications involves several distinct concerns: GraphQL

GraphQL

Testing Type-Safe GraphQL: Pothos (TypeScript) and Strawberry (Python)

Code-first GraphQL frameworks like Pothos (TypeScript) and Strawberry (Python) generate schemas from type-annotated code, which fundamentally changes the testing approach. Your types become the schema, so testing the types tests the schema. This post covers testing strategies specific to code-first GraphQL — plugin testing, type resolution, auth guards, Relay pagination, and

Hasura

Testing Hasura GraphQL: Permissions, Relationships, and Computed Fields

Hasura generates a GraphQL API directly from your PostgreSQL schema, which means your tests must cover things that don't exist in hand-written APIs: role-based permission rules, relationship traversal, computed fields backed by SQL functions, and event triggers. This post shows a complete pytest-based testing strategy for Hasura with

GraphQL

GraphQL API Testing Guide: Unit, Integration, and E2E Testing with the Right Tools

GraphQL APIs require a layered testing strategy that covers resolvers in isolation, schema stitching, and full client-to-server flows. This guide walks through unit testing individual resolvers with Jest, integration testing with Apollo Server's executeOperation, end-to-end testing with real clients, mocking with MSW, and testing subscriptions — with tool recommendations

GraphQL

GraphQL Schema Contract Testing: Preventing Breaking Changes with Inspector

GraphQL schemas evolve, and every change carries the risk of breaking clients. Contract testing catches breaking changes before deployment by comparing schema versions and validating that client queries still work against the new schema. This post covers what counts as a breaking change, how to use GraphQL Inspector for schema

Apollo Server

Testing Apollo Server: Resolvers, DataSources, and Subscriptions with Jest

Apollo Server v4 introduced a cleaner testing API centered on executeOperation, which lets you run full GraphQL operations without spinning up an HTTP server. This post covers testing resolvers, DataSources, authentication via context, subscriptions with graphql-ws, and how to use snapshot testing effectively for GraphQL responses — all with Jest. Key

Testing

Apollo Client Testing: Mocking Queries, Mutations, and Cache

Apollo Client is the most widely used GraphQL client for React, and testing it properly means going beyond shallow component tests. You need to verify that your components handle loading states, successful data responses, error states, and cache interactions correctly. Apollo provides MockedProvider for exactly this purpose — this guide shows

Testing

urql GraphQL Client Testing: Mock Exchanges, Offline Support, and Subscriptions

urql is a lightweight, extensible GraphQL client for React that uses an exchange-based architecture. Unlike Apollo's MockedProvider, urql testing uses mock exchanges to intercept operations. This guide covers everything from basic query mocking to offline support testing and subscriptions. Understanding urql's Exchange Architecture urql processes GraphQL

Testing

Relay Modern Testing: MockPayloadGenerator, relay-test-utils, and Fragment Testing

Relay Modern is Facebook's production GraphQL client, built for performance and type safety. Its testing approach is unlike Apollo or urql — Relay provides relay-test-utils with MockEnvironment and MockPayloadGenerator that work at the Relay runtime level. This guide covers the full Relay testing toolkit. Why Relay Testing is Different

Testing

GraphQL Client Mocking Strategies: MSW, graphql-tools Mock Schema, and Beyond

When testing GraphQL client code, you have multiple layers where you can inject mocks: at the network level (MSW), at the schema level (graphql-tools), at the client level (Apollo MockedProvider, urql exchanges), or at the component level. Each approach has tradeoffs. This guide compares them and shows when to use