Guard reserved access with lock in tests

[pierDipi]

Fix data race in tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.91%. Comparing base (a228d2b) to head (c4206df).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8457   +/-   ##
=======================================
  Coverage   63.91%   63.91%           
=======================================
  Files         391      391           
  Lines       23543    23543           
=======================================
  Hits        15048    15048           
  Misses       7691     7691           
  Partials      804      804           

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, pierDipi

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[pierDipi]

/test unit-tests

[matzew]

/test unit-tests

[knative-prow]

@pierDipi: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
unit-tests_eventing_main	c4206df	link	true	/test unit-tests

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[matzew]

there seems to be a test issue