Testing

Test Coverage Expansion Initiative

Expanded unit test coverage across enterprise apps...

TestingCoverageAngular
~3000Increased coverage accross tests
1000+Tests Added
~250Spec Files Changed
169Spec Files Created

The Problem

Both applications VINELink and VINEWatch had areas of low test coverage, increasing the risk of regressions during development and releases.

Quick Summary

TL;DR

  • Problem: Low and uneven test coverage increased regression risk across critical application areas
  • Solution: Expanded and improved unit tests incrementally across high-risk components and weak coverage areas
  • Impact: Added 1,000+ tests, strengthened release confidence, and improved reliability across enterprise applications

Technical Leadership

  • Identified critical gaps in test coverage across key components and features, and proposed a strategic initiative to expand unit testing efforts.
  • Created a structured plan to incrementally add meaningful tests while maintaining development velocity and avoiding disruption to ongoing feature delivery.
  • Reduced tech debt by adding tests to areas of the codebase that were previously empty or had minimal coverage, improving overall reliability and reducing regression risk across releases.
  • Added tests in the process of feature development especially when developing new functionality or modifying existing code, ensuring that new and changed code was adequately covered by tests.
  • Pushed back on pull requests that neglected to add unit tests for new or changed code, advocating for a culture of testing and quality across the engineering team.

What I Did

Graphic shows the impact of the test coverage expansion to 63% of codebase coveraged by unit tests.
Graphic shows the impact of the test coverage expansion to 63% of codebase coveraged by unit tests
  • Using shallow stubs and mocks, I added over 1,000 new unit tests, and improved coverage across more than 2000 existing test cases, focusing on critical components and features with previously low coverage.
  • I prioritized areas of the codebase thate were empty or had minimal coverage, ensuring that new tests provided meaningful validation of functionality and edge cases.
  • The initiative included both adding new tests and improving existing ones to enhance reliability and reduce regression risk across releases.
  • The work was done incrementally to maintain development velocity and avoid disruption to ongoing feature delivery.
  • Fixed 70+ failing unit tests in the process of upgrading from Angular 15 to 18, and added new tests to cover gaps exposed during the upgrade process.
  • Fixed 260+ failing unit tests in the process of upgrading from Angular 18 to 21, and added new tests to cover gaps exposed during the upgrade process.

Outcome

  • In VINEWatch I added 556 new unit tests in Karma / Jasmine spec files, and 63 new unit tests in Vitest spec files.
  • In VINEWatch, 166 spec files changed, and 86 spec files added.
  • In VINELink, I added 293 new unit tests in Karma / Jasmine spec files, and 79 new unit tests in Vitest spec files.
  • In VINELink, 83 spec files changed, and 69 spec files added.
  • The expanded test coverage significantly reduced regression risk across releases and improved confidence in ongoing development.