[PATCH v1 2/6] tests/qtest/migration-test: Only wait for serial output where migration succeeds

["Alex Bennée" <alex.bennee@linaro.org>]

From: Thomas Huth <thuth@redhat.com>

Waiting for the serial output can take a couple of seconds - and since
we're doing a lot of migration tests, this time easily sums up to
multiple minutes. But if a test is supposed to fail, it does not make
much sense to wait for the source to be in the right state first, so
we can skip the waiting here. This way we can speed up all tests where
the migration is supposed to fail. In the gitlab-CI gprov-gcov test,
each of the migration-tests now run two minutes faster!

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220819053802.296584-2-thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/qtest/migration-test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 520a5f917c..7be321b62d 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -1307,7 +1307,9 @@ static void test_precopy_common(MigrateCommon *args)
     }
 
     /* Wait for the first serial output from the source */
-    wait_for_serial("src_serial");
+    if (args->result == MIG_TEST_SUCCEED) {
+        wait_for_serial("src_serial");
+    }
 
     if (!args->connect_uri) {
         g_autofree char *local_connect_uri =
-- 
2.30.2