Add test that `iterator.seek()` upholds snapshot guarantee

Level / abstract-level

Abstract class for a lexicographically sorted key-value database.

MIT License

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Add test that `iterator.seek()` upholds snapshot guarantee #9

Closed vweevers closed 2 years ago

vweevers commented 2 years ago

I found a bug in memdown / memory-level: its iterator._seek() reads from the current (aka latest) state of the database, rather than the state from when the iterator was created.

This should be covered by a test in the abstract test suite.