[lldb-dev] LLDB tests

[Steve Trotter via lldb-dev]

Hi all,

I'm fairly new to LLVM and LLDB, I became interested in this project about
3 months back and I'm hoping to be able to contribute to improving LLDB in
time. I've been trying to get to grips with the code and have been looking
into the tests as a rough guide to how things work, however I have some
questions about the test suites in LLDB.

It seems to me that we essentially have tests ran by the LIT runner from
LLVM core and tests ran by an LLDB specific python script `dotest.py`. I
notice that on the test page for LLDB they refer to the `dotest.py` tests
ran by a `ninja --check-lldb` but not the latter. I also notice in an email
titled "lldb-server tests" from Paval Labath on 15th May 2017 suggests that
the plan long term is to be to move purely to using LIT style testing. Is
this correct or have I misunderstood? I did have a look in buildbot to see
what tests are being used and I can only find the `dotest.py` style tests,
however it's possible I've misunderstood something here, the
"lldb-x86_64-ubuntu-14.04-cmake" is not easy to make sense of I'm afraid.

Also there seems only to be one test for lldb-server in the LIT suite at
present. Is there a reason for this at present, possibly along the lines of
we're still waiting for the ability to run tests remotely using LIT as per
this email thread? I couldn't find an obvious answer as to whether a design
was agreed upon for this and/or the work completed, maybe it's an ongoing
question still.

Finally, I do see failures myself in both of these tests from the latest
build. I do tend to limit it to compiling only for X86 target and I suspect
this may be related, or possibly just something odd with my build system
anyway. Obviously in an ideal world these tests should always pass but does
anyone else have similar problems? I assume they tend to pass for the core
developers as it seems to be fairly LLVM centric to ensure passing tests
for new bits of work. I can send the outputs of the failing tests if it's
thought useful.

Many thanks for your time,

Steve
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