Integration tests with test server in GraphQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of integration tests with a test server in GraphQL?

Integration tests with a test server check if different parts of the GraphQL API work together correctly, including the server, schema, and database, by running real queries and mutations.

beginner

Why do we use a separate test server instead of the production server for integration tests?

A separate test server prevents interference with real data and users, allowing safe testing of queries and mutations without affecting the live system.

intermediate

Which component is essential to start before running integration tests on a GraphQL API?

The test server must be started with the full GraphQL schema and connected to a test database or mock data source to simulate real interactions.

intermediate

How can you verify the output of a GraphQL query in an integration test?

By sending the query to the test server and checking the returned JSON response matches the expected data structure and values.

intermediate

What is a common tool or library used to run integration tests against a GraphQL test server?

Tools like Jest combined with Apollo Server Testing utilities or supertest can be used to send queries and mutations to the test server and assert results.

What does an integration test with a GraphQL test server primarily check?

A If the database schema is normalized

B If the frontend UI looks good

C If the GraphQL API components work together correctly

D If the server hardware is fast enough

Integration tests focus on how different parts of the API work together, not UI or hardware.

Why should integration tests use a test database instead of the production database?

A To avoid corrupting real data

B Because test databases are faster

C To save disk space

D Because production databases do not support GraphQL

Using a test database protects real data from accidental changes during testing.

Which of the following is needed to run integration tests on a GraphQL API?

A A web browser

B Only the frontend code

C A text editor

D A running test server with schema and data

Integration tests require a test server running the GraphQL schema and connected to data.

How do you check if a GraphQL query returns the correct data in an integration test?

A Verify the query syntax only

B Compare the JSON response to expected results

C Check the server CPU usage

D Look at the server logs

The test compares the actual response data to what is expected to confirm correctness.

Which tool is commonly used to write integration tests for GraphQL servers?

A Jest

B Photoshop

C Excel

D Docker Compose

Jest is a popular testing framework used for writing integration tests in JavaScript/GraphQL projects.

Explain the steps to set up and run an integration test with a GraphQL test server.

Think about what you need before running queries and how to verify results.

Why is it important to isolate integration tests from the production environment?

Consider risks of running tests on live systems.