Integration Test

You might say

Test that submitting a registration form sends correct fields, the API saves them, and the page shows server errors.

An integration test verifies that multiple modules or dependencies cooperate correctly.A registration form sends a name to an API, the API writes a database, then returns success or error to the page. This finds mismatched field names, formats, and error handoff. A pure calculation function with fixed input remains a unit test.

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Unit Test API

Integration Test

How a form, API, and database save together

Trip bookingBK-2048

NameLinDeparture2026-08-08

NETWORKPOST /bookings

Waiting for page request…

bookings

iddatestatus

No new row yet

Looking at both the page request and stored result checks the connection between modules.

Integration tests look at handoffs

Handoffs create unique failures: A page can send startDate while a server expects start_date; each unit may work alone but fail together. Integration tests check requests, responses, and formats across neighboring modules.

Errors travel through the connection too: When the server rejects a registration, the page should show a useful reason. Checking only a successful write misses whether failure information reaches the right interface.

Quick checkChoose the best answer

Price unit tests pass, but the total is blank after form submission. What best follows integration-test thinking?

Check that the form fields, API response fields, and page fields agreeRewrite the already-passing price function firstTake one screenshot of the blank total and call testing done

You can say this to an AI Agent

Run an integration test for registration saving: check form request fields, API input and response fields, database write, and whether server errors appear on the form. Report one valid and one invalid-input result afterward.

Learn next

1Unit Test→2End-to-End Test→