Move test_lock_file test_helper to the v2 branch

Is your feature request related to a problem? Please describe.
Pull tests from the branch "initial_test_rework" on dmesvcs to the v2 branch

Link to any relevant bugs (e.g. "Relates to bug #xxx")

Describe the solution you'd like
Ensure that all the moved test cases passes in the new branch

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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