[Tests] Add more tests for expressions
[Tests] Add more tests for expressions

AlexeySa/rspamd,minaevmike/rspamd,minaevmike/rspamd,andrejzverev/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,minaevmike/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,minaevmike/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,minaevmike/rspamd,minaevmike/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,minaevmike/rspamd,andrejzverev/rspamd,minaevmike/rspamd,minaevmike/rspamd