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[  FAILED  ] 7 tests, listed below:
[  FAILED  ] MySqlConnectionTest.select
[  FAILED  ] MySqlConnectionTest.selectNullInteger
[  FAILED  ] MySqlConnectionTest.selectNullString
[  FAILED  ] MySqlConnectionTest.selectNullBlob
[  FAILED  ] MySqlConnectionTest.selectNullTimestamp
[  FAILED  ] MySqlConnectionTest.selectEmptyStringBlob
[  FAILED  ] MySqlConnectionTest.deleteByValue

All of them have the same output:

*** ERROR: unable to open database. The test
*** environment is broken and must be fixed before
*** the MySQL tests will run correctly.
*** The reason for the problem is described in the
*** accompanying exception output.
unknown file: Failure
C++ exception with description "unable to prepare MySQL statement <DELETE FROM mysql_connection_test WHERE int_value = ?>, reason: Percona-XtraDB-Cluster prohibits use of DML command on a table (keatest.mysql_connection_test) without an explicit primary key with pxc_strict_mode = ENFORCING or MASTER" thrown in the test fixture's constructor.

Let's see what this means for Percona and other MySQL distributions and if we can make these tests pass for them.