test: unflake StatementTimeoutTest #3692
Merged
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The following changes should reduce the flakiness of this test:
Spanner
instances after each test to prevent requests from previous tests to leak into the next test.waitForDdlRequestOnServer
implementation so it ignoresConcurrentModificationException
. These could happen, as the list of requests is not thread-safe (and can also not easily be modified, as it is part of the gapic-generated code).Fixes #3690
Fixes #3683
Fixes #3368