Fill out missing tests

[0x-r4bbit]

There's a few test scenarios left to be covered by our unit test suite

• https://github.com/logos-co/staking/pull/69/files#diff-2561530a5f24910605d8693b034e64a26a98817f46fd17ae12004dab5c943bfdR477
• https://github.com/logos-co/staking/pull/69/files#diff-2561530a5f24910605d8693b034e64a26a98817f46fd17ae12004dab5c943bfdR653
• https://github.com/logos-co/staking/pull/69/files#diff-2561530a5f24910605d8693b034e64a26a98817f46fd17ae12004dab5c943bfdR654
• https://github.com/logos-co/staking/pull/69/files#diff-2561530a5f24910605d8693b034e64a26a98817f46fd17ae12004dab5c943bfdR656

[0x-r4bbit]

Closing this one as most of the empty blocks have been removed in the mp-estimate work