Work · Case study
In a hospital system, the test suite is part of the clinical safety case.
01 / Challenge
A provider network needed one system for patient records, appointments, billing, pharmacy and internal workflows, replacing legacy tools that were partly manual and did not talk to each other across departments. The release process had no testing enforcement, which in a clinical setting means production defects arrive in workflows that patient care depends on.
02 / Approach
Quality was made a gate rather than a habit. Unit test coverage thresholds must be met before a pull request can be approved, integration tests cover the flows where a defect is most expensive — admission, discharge, billing cycles, pharmacy updates — and SonarQube sits in the pipeline enforcing coverage, duplication, maintainability and security hotspot checks. A deployment that fails a threshold does not go out.
The cost of that discipline is velocity, and that was the real engineering problem. It was answered with reusable test utilities, service mocks and automated test environments, so writing the required tests for a new module is a short task rather than a reason to argue for an exemption.
The system itself is modular by department — patient management, appointment scheduling, billing, pharmacy, inventory and reporting — with deployment pipelines carrying environment validation and rollback.
03 / Outcome
departmental modules
quality gates blocking release
Unit and integration coverage stayed high across core modules through continued feature delivery, and production defects fell materially once the automated gates were enforcing rather than advising. Release stability and deployment confidence improved for the same reason: a build that reaches production has already proved the things a clinical system cannot afford to get wrong.