feat: Add assert_err
and assert_warn
#20100
Open
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This PR adds the
assert_eq
andassert_warn
methods onLazyFrame
andDataFrame
. These methods take a set of (possibly named) properties and verify during execution that these properties hold for all values. If a property does not hold, it will throw an error or a warning, respectively.These methods are currently unstable, but I think they can be marked as stable relatively quickly.