Test Coverage Expansion Initiative

The Problem

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

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

• 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.