duempelkas/.github/prompts/07-tests-and-validation.prompt.md

description, agent

description	agent
Create xUnit tests for transfer consistency, balance calculations, carryover logic, and PDF export totals	agent

Step 7: Tests & Validation

Create tests in tests/Duempelkas.Tests/.

Test 1: Transfer Consistency (TransferServiceTests.cs)

Scenario: CreateTransfer_CreatesLinkedExpenseAndIncome

Given:

• Account A and Account B exist
• Both have AccountYear for 2026 with OpeningBalance = 0

When:

• A transfer of 100.00 EUR is created from A/2026 to B/2026 with title "Test Transfer"

Then:

• Exactly 2 entries are created in the database
• Entry on A is EntryType.Expense, amount = 100.00
• Entry on B is EntryType.Income, amount = 100.00
• Both entries share the same date and title
• Exactly 1 TransferLink exists linking the two entries
• Account A total balance = -100.00
• Account B total balance = +100.00

Scenario: DeleteTransfer_RemovesBothSides

Given:

• A transfer exists between A and B

When:

• The source entry is deleted via IEntryService.DeleteEntryAsync

Then:

• Both entries are removed
• The TransferLink is removed
• Account A and B balances return to 0

Test 2: Yearly Statement Calculation (YearlyStatementCalculationTests.cs)

Scenario: YearlySummary_CalculatesCorrectTotals

Given:

• Account with Year 2026, OpeningBalance = 500.00
• Entries: Income 800.00, Income 400.00, Expense 200.00, Expense 250.00

Then:

• TotalIncome = 1200.00
• TotalExpense = 450.00
• YearlyMovement = 750.00
• ClosingBalance = 1250.00

Scenario: YearlySummary_IncludesTransfersCorrectly

Given:

• Account A, Year 2026, OpeningBalance = 500.00
• Income entry: 1000.00
• Transfer out to Account B: 300.00 (creates Expense entry on A)

Then:

• A's TotalIncome = 1000.00
• A's TotalExpense = 300.00
• A's YearlyMovement = 700.00
• A's ClosingBalance = 1200.00

Test Setup

• Use EF Core InMemory or SQLite in-memory (Data Source=:memory:) for test database.
• Wire up real service implementations against the test database.
• Use FluentAssertions for readable assertions.
• Arrange/Act/Assert pattern throughout.

Manual Verification Checklist (as code comments)

1. Launch on Windows — app window opens with dashboard
2. Launch on Linux — app window opens (requires WebKit2GTK)
3. Create account → appears on dashboard with 0 balance
4. Add year 2026 with carryover 500 → year appears in selector
5. Add income/expense entries → table populates, balance updates
6. Create transfer between accounts → both sides appear with transfer badge
7. Export PDF → file saves, totals match on-screen values
8. Delete transfer → both sides removed, balances correct