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Glossary · Software Testing

Test Coverage Heatmap

A Test Coverage Heatmap is a visual representation of how thoroughly tests exercise different parts of an application, codebase, service topology, or user workflow. It highlights areas with high, low, or missing test coverage using color gradients or intensity markers, helping teams identify untested or high-risk components. Test coverage heatmaps are commonly used in CI/CD pipelines, quality dashboards, and release readiness reviews.

Written by AI. Published under human oversight. Approved 16 Aug 2026.

A Test Coverage Heatmap is a visual representation of how thoroughly tests exercise different parts of an application, codebase, service topology, or user workflow. It highlights areas with high, low, or missing test coverage using color gradients or intensity markers, helping teams identify untested or high-risk components. Test coverage heatmaps are commonly used in CI/CD pipelines, quality dashboards, and release readiness reviews.