diff --git a/tests/codex/slots/prover/helpers.nim b/tests/codex/slots/prover/helpers.nim
new file mode 100644
index 00000000..128e21e5
--- /dev/null
+++ b/tests/codex/slots/prover/helpers.nim
@@ -0,0 +1,115 @@
+
+import std/json
+import std/sequtils
+
+import pkg/poseidon2
+import pkg/constantine/math/arithmetic
+import pkg/constantine/math/io/io_bigints
+
+import pkg/codex/merkletree
+import pkg/codex/slots/types
+
+type
+  Input* = object
+    cellData*: seq[seq[byte]]
+    merklePaths*: seq[seq[Poseidon2Hash]]
+    slotProof*: seq[Poseidon2Hash]
+    datasetRoot*: Poseidon2Hash
+    slotRoot*: Poseidon2Hash
+    entropy*: Poseidon2Hash
+    nCellsPerSlot*: int
+    nSlotsPerDataSet*: int
+    slotIndex*: int
+
+proc toInput*(inputJson: JsonNode): Input =
+  let
+    cellData =
+      inputJson["cellData"].mapIt(
+          it.mapIt(
+            block:
+              var
+                big: BigInt[256]
+                data = newSeq[byte](BigInt[256].bits div 8)
+              assert bool(big.fromDecimal( it.str ))
+              data.marshal(big, littleEndian)
+              data
+          ).concat # flatten out elements
+        )
+
+    merklePaths =
+        inputJson["merklePaths"].mapIt(
+          it.mapIt(
+            block:
+              var
+                big: BigInt[254]
+                hash: Poseidon2Hash
+              assert bool(big.fromDecimal( it.str ))
+              hash.fromBig( big )
+              hash
+          )
+        )
+
+    slotProof = inputJson["slotProof"].mapIt(
+      block:
+        var
+          big: BigInt[254]
+          hash: Poseidon2Hash
+        assert bool(big.fromDecimal( it.str ))
+        hash.fromBig( big )
+        hash
+      )
+
+    datasetRoot = block:
+      var
+        big: BigInt[254]
+        hash: Poseidon2Hash
+      assert bool(big.fromDecimal( inputJson["dataSetRoot"].str ))
+      hash.fromBig( big )
+      hash
+
+    slotRoot = block:
+      var
+        big: BigInt[254]
+        hash: Poseidon2Hash
+      assert bool(big.fromDecimal( inputJson["slotRoot"].str ))
+      hash.fromBig( big )
+      hash
+
+    entropy = block:
+      var
+        big: BigInt[254]
+        hash: Poseidon2Hash
+      assert bool(big.fromDecimal( inputJson["entropy"].str ))
+      hash.fromBig( big )
+      hash
+
+    nCellsPerSlot = inputJson["nCellsPerSlot"].getInt
+    nSlotsPerDataSet = inputJson["nSlotsPerDataSet"].getInt
+    slotIndex = inputJson["slotIndex"].getInt
+
+  Input(
+    cellData: cellData,
+    merklePaths: merklePaths,
+    slotProof: slotProof,
+    datasetRoot: datasetRoot,
+    slotRoot: slotRoot,
+    entropy: entropy,
+    nCellsPerSlot: nCellsPerSlot,
+    nSlotsPerDataSet: nSlotsPerDataSet,
+    slotIndex: slotIndex)
+
+proc toProofInput*[H](input: Input): ProofInput[H] =
+    ProofInput[H](
+      entropy: input.entropy,
+      slotIndex: input.slotIndex,
+      verifyRoot: input.datasetRoot,
+      verifyProof: input.slotProof,
+      slotRoot: input.slotRoot,
+      numCells: input.nCellsPerSlot,
+      numSlots: input.nSlotsPerDataSet,
+      samples: zip(input.cellData, input.merklePaths)
+        .mapIt(Sample[H](
+          data: it[0],
+          merkleProof: it[1]
+        ))
+    )
diff --git a/tests/codex/slots/prover/testcircomcompat.nim b/tests/codex/slots/prover/testcircomcompat.nim
index e0e5cd2d..9d470456 100644
--- a/tests/codex/slots/prover/testcircomcompat.nim
+++ b/tests/codex/slots/prover/testcircomcompat.nim
@@ -2,9 +2,11 @@
 import std/json
 import std/sequtils
 import std/sugar
+import std/options
 
 import pkg/chronos
-import pkg/asynctest
+import pkg/unittest2
+import pkg/poseidon2
 
 import pkg/codex/slots
 import pkg/codex/slots/types
@@ -14,95 +16,42 @@ import pkg/constantine/math/arithmetic
 import pkg/constantine/math/io/io_fields
 import pkg/constantine/math/io/io_bigints
 
+import ./helpers
+
 suite "Test Backend":
-  test "Should verify with known input":
+  let
+    r1cs = "tests/codex/slots/prover/fixtures/proof_main.r1cs"
+    wasm = "tests/codex/slots/prover/fixtures/proof_main.wasm"
+
+  var
+    circom: CircomCompat
+    proofInput: ProofInput[Poseidon2Hash]
+
+  setup:
     let
-      r1cs = "tests/codex/slots/prover/fixtures/proof_main.r1cs"
-      wasm = "tests/codex/slots/prover/fixtures/proof_main.wasm"
-      zkey = "tests/codex/slots/prover/fixtures/proof_main.zkey"
       inputData = readFile("tests/codex/slots/prover/fixtures/input.json")
       inputJson = parseJson(inputData)
-      samples = collect(newSeq):
-        for i in 0..<5:
-          let
-            cellData = inputJson["cellData"][i].mapIt(
-              block:
-                var
-                  big: BigInt[254]
-                  data = newSeq[byte](big.bits div 8)
-                check bool(big.fromDecimal( it.str ))
-                data.marshal(big, littleEndian)
-                data
-              ).concat
 
-            merklePaths = inputJson["merklePaths"][0].mapIt(
-              block:
-                var
-                  big: BigInt[254]
-                  hash: Poseidon2Hash
-                check bool(big.fromDecimal( it.str ))
-                hash.fromBig( big )
-                hash
-            )
+    proofInput = toProofInput[Poseidon2Hash](inputJson.toInput())
 
-          Sample[Poseidon2Hash](
-            data: cellData,
-            merkleProof: merklePaths)
+    # circom = CircomCompat.init(r1cs, wasm, zkey)
+    circom = CircomCompat.init(r1cs, wasm)
+
+  teardown:
+    circom.release()
+
+  test "Should verify with known input":
+    let
+      proof = circom.prove(proofInput).tryGet
+    check circom.verify(proof).tryGet
+
+    proof.release()
+
+  test "Should not verify with wrong input":
+    proofInput.slotIndex = 1 # change slot index
 
     let
-      slotProof = inputJson["slotProof"].mapIt(
-        block:
-          var
-            big: BigInt[254]
-            hash: Poseidon2Hash
-          check bool(big.fromDecimal( it.str ))
-          hash.fromBig( big )
-          hash
-        )
+      proof = circom.prove(proofInput).tryGet
+    check circom.verify(proof).tryGet == false
 
-      datasetRoot = block:
-        var
-          big: BigInt[254]
-          hash: Poseidon2Hash
-        check bool(big.fromDecimal( inputJson["dataSetRoot"].str ))
-        hash.fromBig( big )
-        hash
-
-      slotRoot = block:
-        var
-          big: BigInt[254]
-          hash: Poseidon2Hash
-        check bool(big.fromDecimal( inputJson["slotRoot"].str ))
-        hash.fromBig( big )
-        hash
-
-      entropy = block:
-        var
-          big: BigInt[254]
-          hash: Poseidon2Hash
-        check bool(big.fromDecimal( inputJson["entropy"].str ))
-        hash.fromBig( big )
-        hash
-
-      nCellsPerSlot = inputJson["nCellsPerSlot"].getInt
-      nSlotsPerDataSet = inputJson["nSlotsPerDataSet"].getInt
-      slotIndex = inputJson["slotIndex"].getInt
-
-      proofInput = ProofInput[Poseidon2Hash](
-        entropy: entropy,
-        slotIndex: slotIndex,
-        verifyRoot: datasetRoot,
-        verifyProof: slotProof,
-        numCells: nCellsPerSlot,
-        numSlots: nSlotsPerDataSet,
-        samples: samples)
-
-    var
-      backend = CircomCompat[Poseidon2Hash, Proof].new(r1cs, wasm)
-
-    let
-      proof: Proof = (await backend.prove(proofInput)).tryGet
-
-    check (await backend.verify(proof)).tryGet
-
-    backend.release()
+    proof.release()