Common signs: backend changes break the frontend or mobile app. Usual causes: no automated endpoint tests. What we do: write functional, negative and contract tests and run them in CI. What you get: an API test suite that catches breaking changes.
Our API test suite setup adds automated tests that call your endpoints directly and check the responses, status codes and errors, so a backend change can't silently break your frontend, mobile app or partner integrations. A Codersarts engineer writes the tests and runs them in your CI pipeline. Fixed price from $199 with 1-day delivery.
API Test Suite at a Glance
Item | Details |
|---|---|
Starting price | $199 for up to 15 endpoints |
Delivery | 1 day for 15 endpoints, 3 days for 50 |
Tools | Postman with Newman, pytest, Jest with Supertest, REST Assured |
Test types | Functional, negative, contract and authorization checks |
CI | GitHub Actions, GitLab CI or your pipeline |
What you get | A test suite that catches breaking changes |
Revisions | One revision round included |
What Is an API Test Suite?
An API test suite is a set of automated tests that send requests to your endpoints and check the responses: the data, status codes, schemas and error messages. It runs in seconds, doesn't depend on the user interface, and catches most backend bugs before they reach users.
Signs You Need API Tests
Backend changes break the web or mobile app
Partners report errors after your releases
Your API returns 500 errors in production
Your API documentation and behavior don't match
You test endpoints by hand in Postman
Why APIs Break
No tests
Changes go out without checks.
Undocumented changes
Fields are renamed or removed without warning.
Poor error handling
Invalid input causes crashes instead of clear errors.
Manual testing only
Postman collections exist but aren't run automatically.
Quick Checks You Can Try First
Export your Postman collection and run it with Newman.
Add a test for one invalid request to your most important endpoint.
Compare your OpenAPI file with real responses.
Run tests on every pull request.
If the problem remains, our engineers take it from there.
How We Build Your API Tests
Inventory. We list endpoints and who uses them.
Prioritize. We start with the most critical and most changed.
Write tests. We add functional, negative and contract checks.
Test data. We set up repeatable test data.
Automate. We run tests in CI with clear reports.
Hand over. We document how to add tests for new endpoints.
What You Get
Automated tests for your critical endpoints
Negative and edge-case checks
Schema or contract validation
Tests running in CI
A guide for adding new tests
Example result (illustrative)
A mobile app kept breaking when the backend team renamed fields. We added contract tests against the OpenAPI spec for 22 endpoints. The next breaking rename failed the build before it was merged.
What Is Included and Not Included
Included | Not included |
|---|---|
Up to 15 endpoints in the standard package | Very large APIs (priced by size) |
Functional, negative and contract tests | Security penetration testing (separate service) |
CI setup | Load testing (separate task) |
One revision round | Ongoing test maintenance |
Pricing for an API Test Suite
Package | Best for | Starting at | Delivery |
|---|---|---|---|
Starter suite | Up to 15 endpoints | $199 | 1 day |
Full suite | Up to 50 endpoints with contract tests | $599 | 3 days |
Large API | More endpoints or several services | Custom quote | Agreed with you |
You get a fixed quote after we review your setup. You approve the scope before any payment.
Who This Is For
Teams with web and mobile apps sharing one API
SaaS products with public or partner APIs
Backend teams without automated tests
Apps moving to microservices
What We Need From You
Repository access and API documentation, if any
A test environment and test credentials
The most important endpoints
Your CI platform
Code and data privacy
We sign an NDA on request, work with the least access needed, and never keep copies of your data after delivery. You own all code, configuration and notes.
Key Terms Explained
Endpoint: a URL your API responds to
Contract test: a check that responses match the agreed schema
Negative test: a test that sends invalid input on purpose
Newman: the command-line runner for Postman collections
Common Mistakes We Avoid
Checking only status codes
Testing against shared, changing data
Running tests by hand
Skipping error cases
Need More Than One Task?
Need a wider API testing strategy? See API Testing. Or use Prepaid Developer Hours to cover several tasks from one prepaid balance.
Related Tasks
CI Test Pipeline Setup to run all tests on every change
Add Unit Tests to Your Code for backend logic
Load Test Your App for API performance
Frequently Asked Questions
Which tool should we use?
Usually whatever fits your stack: pytest for Python, Jest with Supertest for Node.js, or Postman with Newman for any API.
Do you test GraphQL?
Yes, including queries, mutations, errors and schema changes.
Can tests use our OpenAPI spec?
Yes. We validate responses against it and can generate starter tests from it.
Will this test API security?
It includes basic authorization checks. Full security testing is a separate service.
Catch Breaking API Changes Automatically
Share your API and its main consumers, and a Codersarts engineer will build tests that run on every change.