libtest: add --exact to make filter matching exact

Filter matching is by substring by default. This makes it impossible
to run a single test if its name is a substring of some other test.
For example, its not possible to run just "mymod::test" with these
tests:

  mymod::test
  mymod::test1
  mymod::test_module::moretests

You could declare by convention that no test has a name that's a
substring of another test, but that's not really practical.

This PR adds the "--exact" flag, to make filter matching exactly
match the complete name.

0 files changed, 0 insertions, 0 deletions