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 63f0c835d..88ccc838c 100644
--- a/test_libs/pyspec/eth2spec/utils/ssz/test_ssz_impl.py
+++ b/test_libs/pyspec/eth2spec/utils/ssz/test_ssz_impl.py
@@ -85,6 +85,16 @@ test_data = [
      "c5c2", chunk("c5c2")),
     ("bitlist TFTFFFTTFTFFFFTT", Bitlist[16](1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1),
      "c5c201", h(chunk("c5c2"), chunk("10"))),
+    ("long bitvector", Bitvector[512](1 for i in range(512)),
+     "ff" * 64, h("ff" * 32, "ff" * 32)),
+    ("long bitlist", Bitlist[512](1),
+     "03", h(h(chunk("01"), chunk("")), chunk("01"))),
+    ("long bitlist", Bitlist[512](1 for i in range(512)),
+     "ff" * 64 + "01", h(h("ff" * 32, "ff" * 32), chunk("0002"))),
+    ("odd bitvector", Bitvector[513](1 for i in range(513)),
+     "ff" * 64 + "01", h(h("ff" * 32, "ff" * 32), h(chunk("01"), chunk("")))),
+    ("odd bitlist", Bitlist[513](1 for i in range(513)),
+     "ff" * 64 + "03", h(h(h("ff" * 32, "ff" * 32), h(chunk("01"), chunk(""))), chunk("0102"))),
     ("uint8 00", uint8(0x00), "00", chunk("00")),
     ("uint8 01", uint8(0x01), "01", chunk("01")),
     ("uint8 ab", uint8(0xab), "ab", chunk("ab")),