diff --git a/test_libs/pyspec/eth2spec/utils/ssz/test_ssz_impl.py b/test_libs/pyspec/eth2spec/utils/ssz/test_ssz_impl.py
index 88ccc838c..637d9c5c4 100644
--- a/test_libs/pyspec/eth2spec/utils/ssz/test_ssz_impl.py
+++ b/test_libs/pyspec/eth2spec/utils/ssz/test_ssz_impl.py
@@ -79,6 +79,12 @@ test_data = [
     ("bit T", bit(True), "01", chunk("01")),
     ("boolean F", boolean(False), "00", chunk("00")),
     ("boolean T", boolean(True), "01", chunk("01")),
+    ("bitvector TTFTFTFF", Bitvector[8](1, 1, 0, 1, 0, 1, 0, 0), "2b", chunk("2b")),
+    ("bitlist TTFTFTFF", Bitlist[8](1, 1, 0, 1, 0, 1, 0, 0), "2b01", h(chunk("2b"), chunk("08"))),
+    ("bitvector FTFT", Bitvector[4](0, 1, 0, 1), "0a", chunk("0a")),
+    ("bitlist FTFT", Bitlist[4](0, 1, 0, 1), "1a", h(chunk("0a"), chunk("04"))),
+    ("bitvector FTF", Bitvector[3](0, 1, 0), "02", chunk("02")),
+    ("bitlist FTF", Bitlist[3](0, 1, 0), "0a", h(chunk("02"), chunk("03"))),
     ("bitvector TFTFFFTTFT", Bitvector[10](1, 0, 1, 0, 0, 0, 1, 1, 0, 1), "c502", chunk("c502")),
     ("bitlist TFTFFFTTFT", Bitlist[16](1, 0, 1, 0, 0, 0, 1, 1, 0, 1), "c506", h(chunk("c502"), chunk("0A"))),
     ("bitvector TFTFFFTTFTFFFFTT", Bitvector[16](1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1),