How do I show code coverage in Swift Packages?

Question

On my M1 mac, using Xcode 13.3, I created a package and displayed the code coverage bar (Editor menu –> Code Coverage).

After running tests, there is no indication of code coverage at all in the source code.

How do I get code coverage when testing a package?

Answer 1

The problem is that you didn't turn on Code Coverage for the library's scheme. Turn it on:

See the checkbox at the bottom: Code Coverage? Check that checkbox.

Now run the package test and coverage will be gathered. The best way to see it, in my experience, is actually in the report navigator:

Edit: In more modern Xcode (14.3 and later) it's simpler. Tests default to using test plans, so just turn on code coverage in the test plan:

Answer 2

As of (at least) Xcode 14, the former answer is no longer correct. For a Swift Package you need to enable this on the test plan.

Steps:

1. Show Test Navigator (CMD + 6)
2. Select the title, in the example: TestPlanExample and select "Edit Test Plan"

3. Select the tab "Configuration" and scroll down to "Code Coverage"
4. Enable Code Coverage and either select "All targets" or select which targets you wish you generate code coverage for.
5. Save the testplan