Hi Jonah,
thank you for the response. I was very unclear - I was thinking of (binary) plugins residing in p2 repositories. Yes, I know the CDT repository (which is also cloned as part of CDT Oomph project) contains the source code of those plugins. I was just wondering whether they are available already packaged. Maybe the CDT test packages are not of usual concern for developers developing on top of CDT (but not modifying CDT itself), but the packages also contain test-oriented API useful for developers extending CDT (such as Codan's CheckerTestCase).
I usually clone also CDT sources because I learn about it by inspecting it. But sometimes I can't import the sources along my projects and therefore I miss the test plugins.
Also, when I made my CDT-based projects Tycho-enabled so I could put them in CI, all plugins except the org.eclipse.cdt.codan.core.tests and org.eclipse.cdt.core.tests are downloaded and resolved.
I just thought that the core API concepts regarding testing (as mentioned Codan's CheckerTestCase) are part of the CDT SDK feature. But it seems they are not or I am doing something incorrectly.
I hope this detailed explanation will more useful for sketching my issue.
Regards,
Ivan