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Run with Coverage runs a run configuration under its runtime’s coverage tool, then reads the report and shows it in three places:
  • Editor gutter: a stripe per line. Green is covered, yellow is partly covered (not every branch or block ran), red is not covered. Hover a stripe for the hit count and branch count.
  • Project view: a percentage of covered lines next to each file and folder.
  • Coverage tool window: a tree of folders and files with Line, % and Branch, % columns. Click a column header to sort; open a file from the tree.

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Run with coverage

1

Pick a configuration

Select a test or program configuration in the run widget, or put the caret in a test or main function.
2

Start the run

Use Run › Run with Coverage, or choose Run ’…’ with Coverage from the gutter run icon menu or the run widget’s More Actions menu. Run Context Configuration with Coverage (in Find Action…, ⌘⇧A / Ctrl+Shift+A) covers the test or program at the caret.
3

Read the results

When the run finishes, the Coverage tool window opens and a notification shows the share of covered lines.
If the coverage tool is missing, a notification names it and offers Install, which runs the install command in the Run tool window. Configurations the IDE does not know how to cover get a notification that explains why.

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Supported runtimes

Not supported:
  • Plain java applications: run a Maven or Gradle test configuration with coverage instead.
  • go run: Go coverage is collected by go test.
  • Deno tasks.
The IDE does not add anything to your project files. For Gradle it passes a temporary init script; for Ruby projects without their own SimpleCov setup it preloads SimpleCov through the environment. Installing a missing tool (for example bundle add simplecov --group test or uv add --dev coverage) does change the project, so the IDE only runs it when you click Install.

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Import a report from CI

Import a Coverage Report… (in Find Action…, or the link in the empty Coverage tool window) shows a report collected elsewhere. The format is detected from the content:
  • lcov tracefile (lcov.info)
  • Go cover profile
  • JaCoCo XML report
  • SimpleCov .resultset.json
File paths recorded on another machine are mapped into the project by their longest matching suffix.

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Manage suites

Each coverage run or imported report is a suite. The last five runs stay available as tabs in the Coverage tool window header. Manage Coverage Reports… (⌘⌥F6 / Ctrl+Alt+F6) opens the Coverage Reports dialog: choose a suite and click Show Selected, Delete a suite, or Import… more reports. Imported reports are remembered per project. To remove the highlighting, use Run › Hide Coverage or the button in the Coverage tool window. Show Coverage brings the selected suite back. Editor stripes follow your edits until the next run.