Spot Coverage Gaps Using the Gutter
Let the IDE help you spot coverage gaps in your testing.
GoLand offers a builtin feature to allow you to run the tests in your project and display the coverage in a tool window as a summary for a package (folder) and file, and for each file, next to each line in the file.
Launch the test with Coverage support and then use the Coverage tool window to navigate to your packages/files and see their coverage.