as @karlnapf says it's really no need to put these tests into a separate file.
The idea is that for each component/class in shogun there's a unit test set (i.e. several different tests) in the file called `<classname>_unittest.cc`. see the developer manual:
http://shogun-toolbox.org/doc/en/latest/developer.html

so i suggest to merge the 2 files for `LibLinear` unit tests, moreover keep the same unit test naming. Namely when you define a unit test in a file it should be:
`TEST(<Class name that is being tested>, <some meaningful test name for the test scenario>)`

So for example `TEST(LibLinearSimSetTest,train_L2R_L2LOSS_SVC)` or `TEST(LibLinearTest,train_L2R_LR)`
are not following this idea since we know that it's a test, i.e. you do not need to have the `Test` suffix in `LibLinearTest` or `LibLinearSimSetTest`. It should be simply `LibLinear`.
so all `LibLinear` test should be something like:
`TEST(LibLinear, <some meaningful test name for the test scenario>)`

and if for example they are both doing training, you can do then:
```
TEST(LibLinear, simple_set_train_L2R_L2LOSS_SVC)
TEST(LibLinear, train_L2R_LR)
```