[crac] RFR: 8377177: [CRaC] Clarify engine use in the testsuite [v2]

[Radim Vansa]

> If possible, test should use simengine.
> If the test is specific to engine behaviour, it should use CracBuilder.engine(...) explicitly.
> If the test can cover more generic behaviour of real engines, either use the default or accept the engine as test arg.

Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:

  Assert number of CracTest arguments

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Changes:
  - all: https://git.openjdk.org/crac/pull/291/files
  - new: https://git.openjdk.org/crac/pull/291/files/5d372439..9f7bb258

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=291&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=291&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/291.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/291/head:pull/291

PR: https://git.openjdk.org/crac/pull/291