Fix for BUG#20716: SHOW INSTANCES statement causes races in IM tests.

  
Fix for the bug in mysql-test-run.pl which prevents other tests succeed
after IM-test failure.
  
The idea of the fix of BUG#20716 is to:
  1. Check each SHOW INSTANCES statement, add necessary "sleep" instruction before;
  2. Move all environment checkings into the one file and include it everywhere.


mysql-test/mysql-test-run.pl:
  Fix bug in mysql-test-run.pl -- kill leftovers if some
  guarded mysqld-instance is still alive after IM shutdown.
mysql-test/r/im_daemon_life_cycle.result:
  Updated result file.
mysql-test/r/im_life_cycle.result:
  Updated result file.
mysql-test/r/im_options_set.result:
  Updated result file.
mysql-test/r/im_options_unset.result:
  Updated result file.
mysql-test/r/im_utils.result:
  Updated result file.
mysql-test/t/im_daemon_life_cycle.imtest:
  Include im_check_env.inc for the checking of environment.
mysql-test/t/im_life_cycle.imtest:
  Include im_check_env.inc for the checking of environment.
mysql-test/t/im_options_set.imtest:
  Include im_check_env.inc for the checking of environment.
mysql-test/t/im_options_unset.imtest:
  Include im_check_env.inc for the checking of environment.
mysql-test/t/im_utils.imtest:
  Include im_check_env.inc for the checking of environment.
mysql-test/include/im_check_env.inc:
  A new file to be included in each IM-test.
  The statements in the file ensure that starting
  conditions (environment) are as expected.

1 files changed, 27 insertions, 0 deletions

diff --git a/mysql-test/include/im_check_env.inc b/mysql-test/include/im_check_env.inc
new file mode 100644
index 00000000000..169edbac6b3
--- /dev/null
+++ b/mysql-test/include/im_check_env.inc
@@ -0,0 +1,27 @@
+# This file is intended to be used in each IM-test. It contains stamements,
+# that ensure that starting conditions (environment) for the IM-test are as
+# expected.
+
+# Wait for mysqld1 (guarded instance) to start.
+
+--exec $MYSQL_TEST_DIR/t/wait_for_process.sh $IM_MYSQLD1_PATH_PID 30 started
+
+# Check the running instances.
+
+--connect (mysql1_con,localhost,root,,mysql,$IM_MYSQLD1_PORT,$IM_MYSQLD1_SOCK)
+
+--connection mysql1_con
+
+SHOW VARIABLES LIKE 'server_id';
+
+--connection default
+
+# Let IM detect that mysqld1 is online. This delay should be longer than
+# monitoring interval.
+
+--sleep 2
+
+# Check that IM understands that mysqld1 is online, while mysqld2 is
+# offline.
+
+SHOW INSTANCES;