Re: [Qemu-devel] [PATCH v3 2/6] tests: migration test deprecated commands

[Peter Xu <peterx@redhat.com>]

On Tue, Dec 26, 2017 at 08:51:10PM +0100, Juan Quintela wrote:
> Peter Xu <peterx@redhat.com> wrote:
> > On Fri, Dec 01, 2017 at 01:58:09PM +0100, Juan Quintela wrote:
> >> We now test the deprecated commands everytime that we test the new
> >> commands.  This makes unnecesary to add tests for deprecated commands.
> >> 
> >> Signed-off-by: Juan Quintela <quintela@redhat.com>
> >> ---
> >>  tests/migration-test.c | 32 ++++++++++++++++++++++++++++----
> >>  1 file changed, 28 insertions(+), 4 deletions(-)
> >> 
> >> diff --git a/tests/migration-test.c b/tests/migration-test.c
> >> index 799e24ebc6..51f49c74e9 100644
> >> --- a/tests/migration-test.c
> >> +++ b/tests/migration-test.c
> >> @@ -369,7 +369,7 @@ static void migrate_check_parameter(QTestState *who, const char *parameter,
> >>      QDECREF(rsp);
> >>  }
> >>  
> >> -static void migrate_set_downtime(QTestState *who, const double value)
> >> +static void deprecated_set_downtime(QTestState *who, const double value)
> >>  {
> >>      QDict *rsp;
> >>      gchar *cmd;
> >> @@ -388,7 +388,7 @@ static void migrate_set_downtime(QTestState *who, const double value)
> >>      g_free(expected);
> >>  }
> >>  
> >> -static void migrate_set_speed(QTestState *who, const char *value)
> >> +static void deprecated_set_speed(QTestState *who, const char *value)
> >>  {
> >>      QDict *rsp;
> >>      gchar *cmd;
> >> @@ -402,6 +402,30 @@ static void migrate_set_speed(QTestState *who, const char *value)
> >>      migrate_check_parameter(who, "max-bandwidth", value);
> >>  }
> >>  
> >> +static void migrate_set_parameter(QTestState *who, const char *parameter,
> >> +                                  const char *value)
> >> +{
> >> +    QDict *rsp;
> >> +    gchar *cmd;
> >> +
> >> +    if (strcmp(parameter, "downtime-limit") == 0) {
> >> +        deprecated_set_downtime(who, 0.12345);
> >> +    }
> >> +
> >> +    if (strcmp(parameter, "max-bandwidth") == 0) {
> >> +        deprecated_set_speed(who, "12345");
> >> +    }
> >
> > I'm fine with current approach, but I would really prefer to put them
> > all into a standalone test, by just calling them one by one with some
> > specific numbers and that's all.
> 
> That means another test (at least), and we have, also at least three
> deprecated comands:
> - migrate_set_speed
> - migrate_set_downtime
> - migrate_set_cache_size
> 
> And each test makes things slower.  So I *thought* it would we wiser to
> just check _always_ use the deprecated an the not deprecated one.
> 
> > (luckily we only have two deprecated commands and limited tests,
> >  otherwise extra commands will be M*N, say "number of deprecated
> >  command" * "number of test mirations")
> 
> Each test takes time, so adding tests make everything much slower.
> Notice that setting a new setting is fast.
> 
> This was the way that I understood Dave he wanted.

Do you mean every test is slow, or just migration tests?  Here I mean
to only test setting the parameters without doing real migration tests
(then query to make sure the settings were taking effect).  I assume
that should be fast too?  Thanks,

-- 
Peter Xu