clearMocks throws error on large test suite

After creating over 30 tests with 3 transactions each, I started getting a Parent database is not open error. I have clearMocks flag enabled. When I disable it, error doesn’t appear but my tests are no longer valid.

I have an 8 core linux machine and I tried to reduce concurrency to 1 and still got the same error.

See this log:

events.js:287
      throw er; // Unhandled 'error' event
      ^
Error [OpenError]: Parent database is not open
    at .../project/node_modules/levelup/lib/levelup.js:119:23
    at .../project/node_modules/abstract-leveldown/abstract-leveldown.js:38:14
    at .../project/node_modules/deferred-leveldown/deferred-leveldown.js:31:21
    at .../project/node_modules/encoding-down/node_modules/abstract-leveldown/abstract-leveldown.js:38:14
    at .../project/node_modules/subleveldown/node_modules/abstract-leveldown/abstract-leveldown.js:38:14
    at onopen (.../project/node_modules/subleveldown/leveldown.js:141:35)
    at processTicksAndRejections (internal/process/task_queues.js:79:11)
    at runNextTicks (internal/process/task_queues.js:66:3)
    at processImmediate (internal/timers.js:429:9)
    at process.topLevelDomainCallback (domain.js:137:15)
Emitted 'error' event on LevelUP instance at:
    at .../project/node_modules/levelup/lib/levelup.js:60:19
    at .../project/node_modules/levelup/lib/levelup.js:119:14
    at .../project/node_modules/abstract-leveldown/abstract-leveldown.js:38:14
    [... lines matching original stack trace ...]
    at processImmediate (internal/timers.js:429:9)

I tried to reproduce with minimal code but it is hard.

[napsta32]

Last time it worked with my 80 tests test suite. Now that I started using test.each (and some other changes) it stops working at 39 tests (it is working fine with 38 tests).

I will try to simplify more my test code.

[corollari]

Yep, the package definitely needs better error messages.