[backport 3.2] test: stabilize engine/errinj_ddl test #11096
Merged
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(This PR is a backport of #11093 to
release/3.2
to a future3.2.2
release.)The test relied on fibers finishing execution in particular order and setting/unsetting error injections in time. Of course it was flaky. In all the 3 flaky cases the fiber unsetting the injection could be executed before the fiber which sets the injection, and the rest of the test would run with that injection being set.
Fix this properly and remove the test from the fragile list.
Closes tarantool/tarantool-qa#20
NO_CHANGELOG=flaky test
NO_DOC=flaky test