diff --git a/tests/evm/precompiles/test_ecRecover.py b/tests/evm/precompiles/test_ecRecover.py
index 8ed8d55bf..2f46f88c4 100644
--- a/tests/evm/precompiles/test_ecRecover.py
+++ b/tests/evm/precompiles/test_ecRecover.py
@@ -4,7 +4,6 @@
 from common import CallContext, rand_fq
 from eth_keys import keys  # type: ignore
 from eth_utils import keccak
-from itertools import product
 from zkevm_specs.evm_circuit import (
     Bytecode,
     CallContextFieldTag,
@@ -15,15 +14,13 @@
     Tables,
     verify_steps,
 )
+from zkevm_specs.evm_circuit.execution.precompiles.ecrecover import SECP256K1N
 from zkevm_specs.util import (
     Word,
     FQ,
 )
 from zkevm_specs.evm_circuit.table import SigTableRow
 
-# FIXME: import from ecRecover.py
-SECP256K1N = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141
-
 
 def gen_testing_data():
     # basic
@@ -32,49 +29,44 @@ def gen_testing_data():
     address = sk.public_key.to_canonical_address()
     msg_hash = keccak(bytes(msg, "utf-8"))
     sig = sk.sign_msg_hash(msg_hash)
+    v = sig.v
+    r = sig.r
+    s = sig.s
 
-    # sig_r is over upper bound
-    # sig2 = sig
-    # sig2.r = SECP256K1N
-
-    # # sig_r is over upper bound
-    # sig3 = sig
-    # sig3.r = 1
-
-    # sig_v is 29
-    # sig4 = sig
-    # sig4.v = 29
-
-    # print(f"** {sig} =?= {sig4}")
+    # successful case
+    normal = [CallContext(), msg_hash, v, r, s, address]
 
-    normal = [CallContext(), msg_hash, sig, address, True]
-    # zero_addr = [CallContext(), msg_hash, sig, 0, False]
-    # sig_r_over_ub = [CallContext(), msg_hash, sig2, 0, False]
-    # sig_r_zero = [CallContext(), msg_hash, sig3, 0, False]
-    # sig_v_29 = [CallContext(), msg_hash, sig4, 0, False]
+    # failure cases
+    zero_addr = [CallContext(), msg_hash, v, r, s, bytes(0)]
+    sig_r_over_ub = [CallContext(), msg_hash, v, SECP256K1N, s, bytes(0)]
+    sig_s_over_ub = [CallContext(), msg_hash, v, r, SECP256K1N, bytes(0)]
+    sig_r_one = [CallContext(), msg_hash, v, 1, s, bytes(0)]
+    sig_s_one = [CallContext(), msg_hash, v, r, 1, bytes(0)]
+    sig_v_29 = [CallContext(), msg_hash, v, SECP256K1N, s, bytes(0)]
 
-    return [normal]
-    # return [normal, zero_addr, sig_r_over_ub, sig_r_zero, sig_v_29]
+    return [normal, zero_addr, sig_r_over_ub, sig_s_over_ub, sig_r_one, sig_s_one, sig_v_29]
 
 
 TESTING_DATA = gen_testing_data()
 
 
 @pytest.mark.parametrize(
-    "caller_ctx, msg_hash, sig, address, success",
+    "caller_ctx, msg_hash, v, r, s, address",
     TESTING_DATA,
 )
 def test_ecRecover(
     caller_ctx: CallContext,
     msg_hash: bytes,
-    sig: keys.Signature,
+    v: int,
+    r: int,
+    s: int,
     address: bytes,
-    success: bool,
 ):
     call_id = 1
     callee_id = 2
     gas = Precompile.ECRECOVER.base_gas_cost()
 
+    success = True if len(address) != 0 else False
     call_data_offset = 0
     call_data_length = 0x80
     return_data_offset = 0
@@ -82,19 +74,20 @@ def test_ecRecover(
 
     aux_data = [
         Word(msg_hash),
-        Word(sig.v + 27),
-        Word(sig.r),
-        Word(sig.s),
+        Word(v + 27),
+        Word(r),
+        Word(s),
         FQ(int.from_bytes(address, "big")),
     ]
 
+    # assign sig_table
     sig_row: List[SigTableRow] = []
     sig_row.append(
         SigTableRow(
             Word(msg_hash),
-            FQ(sig.v),
-            Word(sig.r),
-            Word(sig.s),
+            FQ(v),
+            Word(r),
+            Word(s),
             FQ(int.from_bytes(address, "big")),
             FQ(success),
         )