add search tests for IndexedSeq (#763)
add search tests for IndexedSeq (#763)

Add search tests for IndexedSeq

Co-authored-by: Jeniffer Limagraf <5294631aeaceb053f78de5728b2d05bbc59f3e84@epfl.ch>
non/spire,adampingel/spire,non/spire,adampingel/spire