Running Gin on one of its dependencies

[sandybrownlee]

If Gin is run of one of it’s dependencies (e.g. commons libraries) a linkage error occurs if a different version off the same library is used. This is to be expected as two classes with the same name are loaded to the CacheClassLoader. In this case InternalTestRunner simply should not be run: we need to confirm that it's okay with ExternalTestRunner, and then add a note on that to the README.

[GiovaniGuizzo]

It is somewhat OK with ExternalTestRunner. However, in some cases it still fails. Namely, when the test cases perform any kind of operation over JUnit classes (e.g. commons-lang tests for AnnotationUtils are executed over the @Test annotation).

I also experienced some issues when test cases use reflection, although I don't know exactly why.

[justynapt]

Encountered the same thing today (with guava dependency and com.google.truth project). -j options don't resolve this.

[justynapt]

for now: let's put in documentation that strange things might happen in this case, could be eventually respolved using ExternalTestRunnar later