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NISA / API testing

API testing and integration reliability

Most user journeys rely on APIs: payments, identity, business data, partners. Testing them directly catches errors earlier and faster than through the interface, and secures every change.

Common challenges

  • An API change that breaks a consuming application.
  • Data errors discovered late through the interface.
  • Error cases and edge cases rarely tested.
  • API documentation that no longer matches actual behaviour.

When to call on NISA

  • When creating APIs or opening them to partners.
  • In architectures made of many services.
  • Before a migration or an API version change.
  • When UI tests become too slow.

Scope of the engagement

  • Functional testing of endpoints
  • Checks on formats, status codes and error cases
  • Contract testing between providers and consumers
  • Automated regression
  • Initial performance checks where needed

Engagement steps

  1. 01

    Inventory

    List APIs, their consumers and critical exchanges.

  2. 02

    Design

    Define nominal, edge and error test cases.

  3. 03

    Automation

    Set up collections or suites that run continuously.

  4. 04

    Follow-up

    Analyse results and adjust coverage as APIs evolve.

Possible deliverables

  • Map of tested APIs
  • Documented test cases
  • Automated API test suite
  • Execution reports

Frequently asked questions

Do we need API documentation to start?
It helps but is not required. Test cases can be built from observed exchanges and business rules.
Do API tests replace UI tests?
No, they complement them. They reduce the number of UI tests needed and catch errors earlier.
Can you test partner APIs?
Yes, within the environments and permissions made available.

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