public void PartitionIf_WithEmptyEnumerableAndNullProvider_Throws() => Throws <ArgumentNullException>( () => ENMRBL_EMPTY.PartitionIf(null).ToList());
public void PartitionIf_WithEmptyEnumerable_ExpectsSameEnumerable() => Utilities.AssertManySequencesEqual( ENMRBL_EMPTY.PartitionIf(AlwaysSamePartition), ENMRBL_EMPTY);