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

[Juan Quintela <quintela@redhat.com>]

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.

Later, Juan.


>
> Thanks,
>
>> +
>> +    cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
>> +                          "'arguments': { '%s': %s } }",
>> +                          parameter, value);
>> +    rsp = qtest_qmp(who, cmd);
>> +    g_free(cmd);
>> +    g_assert(qdict_haskey(rsp, "return"));
>> +    QDECREF(rsp);
>> +    migrate_check_parameter(who, parameter, value);
>> +}
>> +
>>  static void migrate_set_capability(QTestState *who, const char *capability,
>>                                     const char *value)
>>  {
>> @@ -530,8 +554,8 @@ static void test_migrate(void)
>>       * quickly, but that it doesn't complete precopy even on a slow
>>       * machine, so also set the downtime.
>>       */
>> -    migrate_set_speed(from, "100000000");
>> -    migrate_set_downtime(from, 0.001);
>> +    migrate_set_parameter(from, "max-bandwidth", "100000000");
>> +    migrate_set_parameter(from, "downtime-limit", "1");
>>  
>>      /* Wait for the first serial output from the source */
>>      wait_for_serial("src_serial");
>> -- 
>> 2.14.3
>>