We are excited to introduce the test coverage trends chart, a new way to visually track the overall test coverage of a repository over time. For repositories with test coverage enabled, this chart will now appear on the trends tab in addition to the GPA and Churn vs. Quality charts.
Data is plotted on a weekly basis, with each data point corresponding to the most recent coverage payload received for the repository’s default branch within that week. The coverage value is also given a rating (A, B, C, D, or F) that reflects the degree of test coverage, with each rating appearing as a different color band.
Data is available beginning the week of 3/26/2017.