diff --git a/src/createRollupPrepareDeploymentParamsConfig.unit.test.ts b/src/createRollupPrepareDeploymentParamsConfig.unit.test.ts
index cc8081fc..7b88d045 100644
--- a/src/createRollupPrepareDeploymentParamsConfig.unit.test.ts
+++ b/src/createRollupPrepareDeploymentParamsConfig.unit.test.ts
@@ -1,5 +1,5 @@
 import { it, expect } from 'vitest';
-import { createPublicClient, http } from 'viem';
+import { Address, createPublicClient, http } from 'viem';
 
 import { arbitrumOne, arbitrumSepolia } from './chains';
 import { prepareChainConfig } from './prepareChainConfig';
@@ -8,6 +8,32 @@ import { createRollupPrepareDeploymentParamsConfig } from './createRollupPrepare
 const chainId = 69_420n;
 const vitalik: `0x${string}` = '0xd8da6bf26964af9d7eed9e03e53415d37aa96045';
 
+function getOverrides({ owner, chainId }: { owner: Address; chainId: bigint }) {
+  return {
+    owner,
+    chainId,
+    chainConfig: prepareChainConfig({
+      chainId: Number(chainId),
+      arbitrum: {
+        InitialChainOwner: owner,
+        InitialArbOSVersion: 30,
+        DataAvailabilityCommittee: true,
+      },
+    }),
+    confirmPeriodBlocks: 4200n,
+    extraChallengeTimeBlocks: 5n,
+    loserStakeEscrow: '0x0000000000000000000000000000000000000001',
+    sequencerInboxMaxTimeVariation: {
+      delayBlocks: 200n,
+      delaySeconds: 5n,
+      futureBlocks: 100n,
+      futureSeconds: 1n,
+    },
+    stakeToken: '0x0000000000000000000000000000000000000002',
+    wasmModuleRoot: '0xWasmModuleRoot',
+  } as const;
+}
+
 it('creates config for a chain on top of arbitrum one with defaults', () => {
   const arbitrumOneClient = createPublicClient({
     chain: arbitrumOne,
@@ -29,29 +55,10 @@ it('creates config for a chain on top of arbitrum one with overrides', () => {
   });
 
   expect(
-    createRollupPrepareDeploymentParamsConfig(arbitrumOneClient, {
-      owner: vitalik,
-      chainId,
-      chainConfig: prepareChainConfig({
-        chainId: 69_420,
-        arbitrum: {
-          InitialChainOwner: vitalik,
-          InitialArbOSVersion: 30,
-          DataAvailabilityCommittee: true,
-        },
-      }),
-      confirmPeriodBlocks: 4200n,
-      extraChallengeTimeBlocks: 5n,
-      loserStakeEscrow: '0x0000000000000000000000000000000000000001',
-      sequencerInboxMaxTimeVariation: {
-        delayBlocks: 200n,
-        delaySeconds: 5n,
-        futureBlocks: 100n,
-        futureSeconds: 1n,
-      },
-      stakeToken: '0x0000000000000000000000000000000000000002',
-      wasmModuleRoot: '0xWasmModuleRoot',
-    }),
+    createRollupPrepareDeploymentParamsConfig(
+      arbitrumOneClient,
+      getOverrides({ owner: vitalik, chainId }),
+    ),
   ).toMatchSnapshot();
 });
 
@@ -76,28 +83,9 @@ it('creates config for a chain on top of arbitrum sepolia with overrides', () =>
   });
 
   expect(
-    createRollupPrepareDeploymentParamsConfig(arbitrumSepoliaClient, {
-      owner: vitalik,
-      chainId,
-      chainConfig: prepareChainConfig({
-        chainId: 69_420,
-        arbitrum: {
-          InitialChainOwner: vitalik,
-          InitialArbOSVersion: 30,
-          DataAvailabilityCommittee: true,
-        },
-      }),
-      confirmPeriodBlocks: 4200n,
-      extraChallengeTimeBlocks: 5n,
-      loserStakeEscrow: '0x0000000000000000000000000000000000000001',
-      sequencerInboxMaxTimeVariation: {
-        delayBlocks: 200n,
-        delaySeconds: 5n,
-        futureBlocks: 100n,
-        futureSeconds: 1n,
-      },
-      stakeToken: '0x0000000000000000000000000000000000000002',
-      wasmModuleRoot: '0xWasmModuleRoot',
-    }),
+    createRollupPrepareDeploymentParamsConfig(
+      arbitrumSepoliaClient,
+      getOverrides({ owner: vitalik, chainId }),
+    ),
   ).toMatchSnapshot();
 });