diff --git a/packages/ledger-icp/src/index.canister.spec.ts b/packages/ledger-icp/src/index.canister.spec.ts
new file mode 100644
index 000000000..7db4b501c
--- /dev/null
+++ b/packages/ledger-icp/src/index.canister.spec.ts
@@ -0,0 +1,74 @@
+import { ActorSubclass } from "@dfinity/agent";
+import { mock } from "jest-mock-extended";
+import { _SERVICE as IndexService } from "../candid/index";
+import { IndexCanister } from "./index.canister";
+import { mockAccountIdentifier } from "./mocks/ledger.mock";
+
+describe("IndexCanister", () => {
+  describe("accountBalance", () => {
+    const balanceMock = 30_000_000n;
+
+    it("returns account balance with query call", async () => {
+      const service = mock<ActorSubclass<IndexService>>();
+      service.get_account_identifier_balance.mockResolvedValue(balanceMock);
+      const index = IndexCanister.create({
+        serviceOverride: service,
+      });
+
+      const balance = await index.accountBalance({
+        accountIdentifier: mockAccountIdentifier,
+        certified: false,
+      });
+      expect(balance).toEqual(balanceMock);
+      expect(service.get_account_identifier_balance).toBeCalled();
+    });
+
+    it("returns account balance with update call", async () => {
+      const service = mock<ActorSubclass<IndexService>>();
+      service.get_account_identifier_balance.mockResolvedValue(balanceMock);
+      const index = IndexCanister.create({
+        certifiedServiceOverride: service,
+      });
+
+      const balance = await index.accountBalance({
+        accountIdentifier: mockAccountIdentifier,
+        certified: true,
+      });
+      expect(balance).toEqual(balanceMock);
+      expect(service.get_account_identifier_balance).toBeCalled();
+    });
+
+    it("returns account balance with account identifier as hex", async () => {
+      const service = mock<ActorSubclass<IndexService>>();
+      service.get_account_identifier_balance.mockResolvedValue(balanceMock);
+      const index = IndexCanister.create({
+        serviceOverride: service,
+      });
+
+      const balance = await index.accountBalance({
+        accountIdentifier: mockAccountIdentifier.toHex(),
+        certified: false,
+      });
+      expect(balance).toEqual(balanceMock);
+      expect(service.get_account_identifier_balance).toBeCalled();
+    });
+
+    it("should bubble errors", () => {
+      const service = mock<ActorSubclass<IndexService>>();
+      service.get_account_identifier_balance.mockImplementation(() => {
+        throw new Error();
+      });
+
+      const index = IndexCanister.create({
+        serviceOverride: service,
+      });
+
+      expect(() =>
+        index.accountBalance({
+          accountIdentifier: mockAccountIdentifier.toHex(),
+          certified: false,
+        }),
+      ).toThrowError();
+    });
+  });
+});
diff --git a/packages/ledger-icp/src/ledger.canister.spec.ts b/packages/ledger-icp/src/ledger.canister.spec.ts
index 79ad5e3ed..bbaf791e7 100644
--- a/packages/ledger-icp/src/ledger.canister.spec.ts
+++ b/packages/ledger-icp/src/ledger.canister.spec.ts
@@ -16,12 +16,10 @@ import {
   TxTooOldError,
 } from "./errors/ledger.errors";
 import { LedgerCanister } from "./ledger.canister";
+import { mockAccountIdentifier } from "./mocks/ledger.mock";
 import { E8s } from "./types/common";
 
 describe("LedgerCanister", () => {
-  const accountIdentifier = AccountIdentifier.fromHex(
-    "3e8bbceef8b9338e56a1b561a127326e6614894ab9b0739df4cc3664d40a5958",
-  );
   describe("accountBalance", () => {
     describe("no hardware wallet", () => {
       const tokens = {
@@ -35,7 +33,7 @@ describe("LedgerCanister", () => {
         });
 
         const balance = await ledger.accountBalance({
-          accountIdentifier,
+          accountIdentifier: mockAccountIdentifier,
           certified: false,
         });
         expect(balance).toEqual(tokens.e8s);
@@ -50,12 +48,27 @@ describe("LedgerCanister", () => {
         });
 
         const balance = await ledger.accountBalance({
-          accountIdentifier,
+          accountIdentifier: mockAccountIdentifier,
           certified: true,
         });
         expect(balance).toEqual(tokens.e8s);
         expect(service.account_balance).toBeCalled();
       });
+
+      it("returns account balance with account identifier as hex", async () => {
+        const service = mock<ActorSubclass<LedgerService>>();
+        service.account_balance.mockResolvedValue(tokens);
+        const ledger = LedgerCanister.create({
+          serviceOverride: service,
+        });
+
+        const balance = await ledger.accountBalance({
+          accountIdentifier: mockAccountIdentifier.toHex(),
+          certified: false,
+        });
+        expect(balance).toEqual(tokens.e8s);
+        expect(service.account_balance).toBeCalled();
+      });
     });
 
     describe("transactionFee", () => {
@@ -87,7 +100,7 @@ describe("LedgerCanister", () => {
           hardwareWallet: true,
         });
         const balance = await ledger.accountBalance({
-          accountIdentifier,
+          accountIdentifier: mockAccountIdentifier,
           certified: false,
         });
         expect(typeof balance).toEqual("bigint");
@@ -103,7 +116,7 @@ describe("LedgerCanister", () => {
           hardwareWallet: true,
         });
         const balance = await ledger.accountBalance({
-          accountIdentifier,
+          accountIdentifier: mockAccountIdentifier,
           certified: true,
         });
         expect(typeof balance).toEqual("bigint");
@@ -114,7 +127,7 @@ describe("LedgerCanister", () => {
 
   describe("transfer", () => {
     describe("no hardware wallet", () => {
-      const to = accountIdentifier;
+      const to = mockAccountIdentifier;
       const amount = BigInt(100000);
 
       it("fetches transaction fee if not present", async () => {
@@ -386,7 +399,7 @@ describe("LedgerCanister", () => {
     });
 
     describe("for hardware wallet", () => {
-      const to = accountIdentifier;
+      const to = mockAccountIdentifier;
       const amount = BigInt(100000);
 
       it("handles invalid sender", async () => {
diff --git a/packages/ledger-icp/src/mocks/ledger.mock.ts b/packages/ledger-icp/src/mocks/ledger.mock.ts
new file mode 100644
index 000000000..f35202044
--- /dev/null
+++ b/packages/ledger-icp/src/mocks/ledger.mock.ts
@@ -0,0 +1,5 @@
+import { AccountIdentifier } from "../account_identifier";
+
+export const mockAccountIdentifier = AccountIdentifier.fromHex(
+  "3e8bbceef8b9338e56a1b561a127326e6614894ab9b0739df4cc3664d40a5958",
+);