Windows : create a minimalistic MTR test for mysql_install_db.exe

only --datadir option is tested in this test.
Other options (notably --password and --service) would need another,
more comprehensive test.

mysql-test/main/mysql_install_db_win.result

+# Kill the server
+Running bootstrap
+Removing default user
+Creating my.ini file
+Creation of the database was successful
+my.ini
+SELECT @@datadir;
+@@datadir
+DATADIR/
+# Kill the server

mysql-test/main/mysql_install_db_win.test

+--source include/windows.inc
+
+# Create database  in tmp directory using mysql_install_db.exe, 
+# and start server from this directory.
+let $ddir= $MYSQLTEST_VARDIR/tmp/ddir;
+exec $MYSQL_INSTALL_DB_EXE --datadir=$ddir;
+
+--source include/kill_mysqld.inc
+let $restart_parameters=--datadir=$ddir --loose-innodb;
+--source include/start_mysqld.inc
+
+# Smoke test - check that we're actually using datadir
+# we've created (i.e restart_parameters worked)
+--replace_result  $ddir DATADIR
+SELECT @@datadir;
+
+# restart in the original datadir again
+--source include/kill_mysqld.inc
+rmdir $ddir;
+let $restart_parameters=;
+--source include/start_mysqld.inc
+

mysql-test/mysql-test-run.pl

@@ -2292,6 +2292,10 @@ sub environment_setup {
   $ENV{'EXE_MYSQL'}=                $exe_mysql;
   $ENV{'MYSQL_PLUGIN'}=             $exe_mysql_plugin;
   $ENV{'MYSQL_EMBEDDED'}=           $exe_mysql_embedded;
+  if(IS_WINDOWS)
+  {
+     $ENV{'MYSQL_INSTALL_DB_EXE'}=  mtr_exe_exists("$bindir/sql$opt_vs_config/mysql_install_db");
+  }
 
   my $client_config_exe=
     mtr_exe_maybe_exists(

sql/mysql_install_db.cc

@@ -198,7 +198,7 @@ int main(int argc, char **argv)
     die("database creation failed");
   }
 
-  printf("Creation of the database was successful");
+  printf("Creation of the database was successful\n");
   return 0;
 }