Schema testing in GraphQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is schema testing in GraphQL?

Schema testing in GraphQL is the process of verifying that the GraphQL schema is correctly defined, including types, queries, mutations, and their relationships, to ensure the API behaves as expected.

beginner

Why is schema testing important in GraphQL?

Schema testing helps catch errors early, ensures the API contract is consistent, and prevents breaking changes that could affect clients relying on the GraphQL API.

intermediate

Name two common tools used for GraphQL schema testing.

Two common tools for GraphQL schema testing are Apollo Server's built-in testing utilities and GraphQL Inspector.

intermediate

What does a schema validation test typically check?

It checks that all types, fields, and resolvers exist as defined, that required fields are present, and that the schema follows the expected structure without errors.

advanced

How can schema testing help during API version upgrades?

Schema testing can detect breaking changes or missing fields early, allowing developers to fix issues before clients are affected, ensuring smooth API version upgrades.

What is the main goal of GraphQL schema testing?

A To test the database performance

B To verify the schema matches the API design and works correctly

C To check the frontend UI layout

D To optimize network speed

Schema testing focuses on verifying the GraphQL schema's correctness and structure.

Which of these is NOT typically tested in GraphQL schema testing?

A User interface colors

B Resolver functions

C Field types and names

D Required fields presence

User interface colors are unrelated to GraphQL schema testing.

Which tool can be used to detect breaking changes in a GraphQL schema?

A Postman

B Jest UI

C Chrome DevTools

D GraphQL Inspector

GraphQL Inspector helps detect schema changes and breaking changes.

Schema testing helps prevent which of the following?

A Slow internet connection

B Incorrect CSS styles

C Breaking changes that affect clients

D Database backups

Schema testing prevents breaking changes that could disrupt client applications.

What does a schema validation test NOT check?

A That the API returns correct data values

B That the schema has no syntax errors

C That all fields exist as defined

D That required fields are present

Schema validation tests the schema structure, not the actual data returned.

Explain what schema testing is and why it is important in GraphQL.

Think about how schema testing helps developers and clients.

Describe common checks performed during GraphQL schema testing.

Focus on what parts of the schema are verified.