Build: tests will be automatically started after you explicitly build your solution.
Save: tests will be automatically started after you explicitly save your solution. In this case, JetBrains Rider has to build the related projects on its own. To help you find the balance between the build time and the relevance of the coverage data, dotCover offers you three build options:
Only projects related to continuous testing sessions: JetBrains Rider will build only unit test projects and projects referenced by these unit test projects.
Projects related to continuous testing sessions and projects included in coverage analysis: JetBrains Rider will build projects that fall into the Only projects related to continuous testing sessions category and also projects with code that is not excluded from the coverage analysis.
All projects in solution: JetBrains Rider will always build the entire solution.