How should Splitwise test the financial logic when users settle debts partially and multiple transactions occur over time?

hard📝 Trade-off Q9 of 15

LLD - Design — Splitwise (Expense Sharing)

AFocus on testing the app's notification system

BTest only the first transaction and ignore subsequent ones

CTest only full debt settlements

DSimulate sequences of partial payments and verify cumulative balances after each

Step-by-Step Solution

Solution:

Step 1: Recognize the need to handle multiple partial payments over time
Partial payments affect balances cumulatively and must be tracked accurately.
Step 2: Simulate sequences of payments and verify balances after each step
This ensures the logic correctly updates debts over time.
Final Answer:
Simulate sequences of partial payments and verify cumulative balances after each -> Option D
Quick Check:
Test partial payments cumulatively = Simulate sequences of partial payments and verify cumulative balances after each [OK]

Quick Trick: Verify balances after each partial payment sequence [OK]

Common Mistakes:

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