WIP

BudgetApp.Tests/Services/DashboardServiceTests.cs

@@ -107,6 +107,59 @@ public class DashboardServiceTests
         Assert.Empty(result.Datasets);
     }
 
+    [Fact]
+    public void BuildChartData_PaidFutureTransaction_ExcludedFromProjection()
+    {
+        var today = DateTime.Today;
+        var start = today.AddDays(-1);
+        var end = today.AddDays(5);
+
+        // CurrentBalance is manually maintained by the user — MarkAsPaidAsync never touches it
+        var account = new Account { Id = 1, Name = "Current", Color = "#000", CurrencyCode = "GBP", CurrentBalance = 1000 };
+        var transactions = new List<Transaction>
+        {
+            // Unpaid future expense — should reduce the projected balance
+            new() { Description = "Unpaid Bill", Amount = 100, Date = today.AddDays(3), Type = TransactionType.Expense, AccountId = 1, Account = account, IsPaid = false },
+            // Paid future expense — excluded from projection; CurrentBalance already reflects it (user-managed)
+            new() { Description = "Paid Bill", Amount = 200, Date = today.AddDays(4), Type = TransactionType.Expense, AccountId = 1, Account = account, IsPaid = true }
+        };
+
+        var result = DashboardService.BuildChartData([account], transactions, start, end);
+
+        var data = result.Datasets[0].Data;
+        // Today's index = 1 (start is today-1)
+        int todayIndex = 1;
+        // Balance is flat at CurrentBalance up to the unpaid bill
+        Assert.Equal(1000m, data[todayIndex]);
+        // Day +3 (index 4): unpaid bill applied → 900
+        Assert.Equal(900m, data[todayIndex + 3]);
+        // Day +4 (index 5): paid bill is excluded from projection → stays at 900
+        Assert.Equal(900m, data[todayIndex + 4]);
+    }
+
+    [Fact]
+    public void BuildChartData_PaidFutureTransaction_ExcludedFromDayTransactionLabels()
+    {
+        var today = DateTime.Today;
+        var start = today;
+        var end = today.AddDays(2);
+
+        var account = new Account { Id = 1, Name = "Current", Color = "#000", CurrencyCode = "GBP", CurrentBalance = 500 };
+        var transactions = new List<Transaction>
+        {
+            new() { Description = "Unpaid", Amount = 50, Date = today.AddDays(1), Type = TransactionType.Expense, AccountId = 1, Account = account, IsPaid = false },
+            new() { Description = "Paid", Amount = 100, Date = today.AddDays(2), Type = TransactionType.Expense, AccountId = 1, Account = account, IsPaid = true }
+        };
+
+        var result = DashboardService.BuildChartData([account], transactions, start, end);
+
+        // Day +1: unpaid transaction appears in labels
+        Assert.Single(result.DayTransactionLabels[1]);
+        Assert.Contains("Unpaid", result.DayTransactionLabels[1][0]);
+        // Day +2: paid transaction is excluded from labels
+        Assert.Empty(result.DayTransactionLabels[2]);
+    }
+
     #endregion
 
     #region GetDashboardDataAsync (integration tests)