Add a test to make sure that negative effective values are filtered
Add a test to make sure that negative effective values are filtered

Summary:
This is a partial backport of Core PR10637 : https://github.com/bitcoin/bitcoin/pull/10637/commits/73b5bf2cb40720bb4e4436ea63b5badf3d89ceb9

Depends on D3301

Test Plan:
  make check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D3304

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