diff --git a/apps/backend/src/application/usecases/transaction/__tests__/getTransactionById.test.ts b/apps/backend/src/application/usecases/transaction/__tests__/getTransactionById.test.ts
index 9935c39..c5b563c 100644
--- a/apps/backend/src/application/usecases/transaction/__tests__/getTransactionById.test.ts
+++ b/apps/backend/src/application/usecases/transaction/__tests__/getTransactionById.test.ts
@@ -50,7 +50,7 @@ describe('GetTransactionByIdUseCase', () => {
 
     const mockOperation2: OperationDbRow = {
       accountId: Id.create().valueOf(),
-      amount: Amount.create('500').valueOf(),
+      amount: Amount.create('-1000').valueOf(),
       createdAt: Timestamp.create().valueOf(),
       description: 'Operation 2',
       id: Id.create().valueOf(),
@@ -59,14 +59,14 @@ describe('GetTransactionByIdUseCase', () => {
       transactionId,
       updatedAt: Timestamp.create().valueOf(),
       userId,
-      value: Amount.create('500').valueOf(),
+      value: Amount.create('-1000').valueOf(),
     };
 
     const mockOperation3: OperationDbRow = {
       accountId: Id.create().valueOf(),
-      amount: Amount.create('-500').valueOf(),
+      amount: Amount.create('500').valueOf(),
       createdAt: Timestamp.create().valueOf(),
-      description: 'Operation 2',
+      description: 'Deleted Operation 1',
       id: Id.create().valueOf(),
       isSystem: false,
       isTombstone: true,
@@ -80,14 +80,14 @@ describe('GetTransactionByIdUseCase', () => {
       accountId: Id.create().valueOf(),
       amount: Amount.create('-500').valueOf(),
       createdAt: Timestamp.create().valueOf(),
-      description: 'Operation 2',
+      description: 'Deleted Operation 2',
       id: Id.create().valueOf(),
       isSystem: false,
       isTombstone: true,
       transactionId,
       updatedAt: Timestamp.create().valueOf(),
       userId,
-      value: Amount.create('500').valueOf(),
+      value: Amount.create('-500').valueOf(),
     };
 
     const deletedOperations = [mockOperation3, mockOperation4];
diff --git a/apps/backend/src/infrastructure/db/transaction/transaction.repository.test.ts b/apps/backend/src/infrastructure/db/transaction/transaction.repository.test.ts
index 91474c6..d27729c 100644
--- a/apps/backend/src/infrastructure/db/transaction/transaction.repository.test.ts
+++ b/apps/backend/src/infrastructure/db/transaction/transaction.repository.test.ts
@@ -162,6 +162,9 @@ describe('TransactionRepository', () => {
       });
     });
 
+    it.todo('should return null when transaction does not exist');
+    it.todo('should return null when transaction belongs to another user');
+
     it('should not retrieve a tombstone transaction', async () => {
       const transaction = data.transaction;
 
@@ -180,6 +183,8 @@ describe('TransactionRepository', () => {
   });
 
   describe('create', () => {
+    it.todo('should not create a transaction when user does not exist');
+
     it('should create a new transaction', async () => {
       const transaction = data.transaction;
 
@@ -326,6 +331,8 @@ describe('TransactionRepository', () => {
       );
     });
 
+    it.todo('should not update transaction belonging to another user');
+
     it('should not update isTombstone field when saving', async () => {
       const transaction = data.transaction;
 
@@ -346,6 +353,8 @@ describe('TransactionRepository', () => {
   });
 
   describe('softDelete', () => {
+    it.todo('should not soft delete a transaction belonging to another user');
+
     it('should soft delete the transaction and its operations', async () => {
       const transaction = data.transaction;