Mathieu Cesbron 60f7cb37f2 backtester/engine: Fix TestStart race (#2024) ...

* Fix TestStart race

TestStart does 3 tests
test1 = Start() with no error
test2 = Start() on an already started struct
test3 = Start() on nil

Previously, test1 and test2 were on the same struct. Depending on
the go scheduler, we could have test2 fail because the field "started"
could go from 1 to 0 just after the atomic compare and swap.
So we would Start() a second time on the same struct but the field "started"
would already be back to 0.

* Divide TestStart in 3 tests

* Resolve comments

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Co-authored-by: mathieu cesbron <mathieucesbron@mathieus-MacBook-Pro.local>

2025-09-05 17:26:30 +10:00

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