Unit tests failing

Hello.

I have run the SuiteCRM unit tests and I am getting a large number of failures in the core modules. For example:

SugarBeanTest » Save 1.94s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_SESSION".
Failed asserting that true is false.

SugarEmailAddressTest » Populate addresses 1.82s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Add address 1.75s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Split email address 1.71s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Clean address 1.73s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Get email guid 1.94s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Add update email address 1.96s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Get primary address 1.93s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Get reply to address 1.91s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Get addresses by guid 1.69s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false.

SugarEmailAddressTest » Get email address widget edit view 1.79s
Incorrect state hash (in PHPUnitTest): Hash doesn't match at key "globals::_REQUEST".
Failed asserting that true is false. 

Could someone tell me if this is expected behaviour, or is there something wrong with my SuiteCRM installation?

Thanks,

Carl