update detail.

API/ROLAC.API.Tests/Services/ExpenseServiceTests.cs

@@ -67,14 +67,20 @@ public class ExpenseServiceTests
 
     private static CreateExpenseRequest Reimb() => new()
     {
-        Type = "StaffReimbursement", MinistryId = 1, CategoryGroupId = 1, SubCategoryId = 1,
-        Amount = 45.50m, Description = "Batteries", ExpenseDate = new DateOnly(2026, 5, 28),
+        Type = "StaffReimbursement", MinistryId = 1,
+        Lines = { new ExpenseLineInput { CategoryGroupId = 1, SubCategoryId = 1, Amount = 45.50m } },
+        Description = "Batteries", ExpenseDate = new DateOnly(2026, 5, 28),
     };
 
     private static UpdateExpenseRequest CloneToUpdate(CreateExpenseRequest r) => new()
     {
-        Type = r.Type, MinistryId = r.MinistryId, CategoryGroupId = r.CategoryGroupId,
-        SubCategoryId = r.SubCategoryId, Amount = r.Amount, Description = r.Description,
+        Type = r.Type, MinistryId = r.MinistryId,
+        Lines = r.Lines.Select(l => new ExpenseLineInput
+        {
+            CategoryGroupId = l.CategoryGroupId, SubCategoryId = l.SubCategoryId,
+            Amount = l.Amount, FunctionalClass = l.FunctionalClass, Description = l.Description,
+        }).ToList(),
+        Description = r.Description,
         VendorName = r.VendorName, MemberId = r.MemberId, CheckNumber = r.CheckNumber,
         ExpenseDate = r.ExpenseDate, Notes = r.Notes,
     };
@@ -207,7 +213,7 @@ public class ExpenseServiceTests
         Assert.Equal("PendingApproval", (await db.Expenses.FindAsync(id))!.Status);
 
         var edit = CloneToUpdate(Reimb());
-        edit.Amount = 99.99m;
+        edit.Lines[0].Amount = 99.99m;
         await svc.UpdateAsync(id, edit, isFinance: false);
 
         var e = await db.Expenses.FindAsync(id);
@@ -260,13 +266,70 @@ public class ExpenseServiceTests
 
         var id = await svc.CreateAsync(new CreateExpenseRequest
         {
-            Type = "VendorPayment", MinistryId = 1, CategoryGroupId = 1, SubCategoryId = 1,
-            Amount = 50m, Description = "x", ExpenseDate = new DateOnly(2026, 5, 1),
-            FunctionalClass = "ManagementGeneral",
+            Type = "VendorPayment", MinistryId = 1,
+            Lines = { new ExpenseLineInput { CategoryGroupId = 1, SubCategoryId = 1, Amount = 50m, FunctionalClass = "ManagementGeneral" } },
+            Description = "x", ExpenseDate = new DateOnly(2026, 5, 1),
         }, isFinance: true);
 
         var dto = await svc.GetByIdAsync(id);
-        Assert.Equal("ManagementGeneral", dto!.FunctionalClass);
+        Assert.Equal("ManagementGeneral", dto!.Lines.Single().FunctionalClass);
+    }
+
+    [Fact]
+    public async Task Create_MultiLine_SetsHeaderTotal_AndRoundTripsLines()
+    {
+        var (svc, db, _) = Build("u1");
+        db.ExpenseCategoryGroups.Add(new ExpenseCategoryGroup { Id = 2, Name_en = "Food & Beverage" });
+        db.ExpenseSubCategories.Add(new ExpenseSubCategory { Id = 2, GroupId = 2, Name_en = "Snacks" });
+        await db.SaveChangesAsync();
+
+        var r = new CreateExpenseRequest
+        {
+            Type = "VendorPayment", MinistryId = 1, VendorName = "Costco",
+            Description = "Mixed invoice", ExpenseDate = new DateOnly(2026, 5, 1),
+            Lines =
+            {
+                new ExpenseLineInput { CategoryGroupId = 1, SubCategoryId = 1, Amount = 30m },
+                new ExpenseLineInput { CategoryGroupId = 2, SubCategoryId = 2, Amount = 12.50m },
+            },
+        };
+        var id = await svc.CreateAsync(r, isFinance: true);
+
+        Assert.Equal(42.50m, (await db.Expenses.FindAsync(id))!.Amount);
+        var dto = await svc.GetByIdAsync(id);
+        Assert.Equal(2, dto!.Lines.Count);
+        Assert.Equal(42.50m, dto.Amount);
+        Assert.Equal(2, dto.LineCount);
+    }
+
+    [Fact]
+    public async Task Create_WithNoLines_Throws()
+    {
+        var (svc, _, _) = Build("u1");
+        var r = Reimb(); r.Lines.Clear();
+        await Assert.ThrowsAsync<InvalidOperationException>(() => svc.CreateAsync(r, isFinance: false));
+    }
+
+    [Fact]
+    public async Task Update_ReplacesLines_AndRecomputesTotal()
+    {
+        var (svc, db, _) = Build("alice");
+        db.ExpenseCategoryGroups.Add(new ExpenseCategoryGroup { Id = 2, Name_en = "Food & Beverage" });
+        db.ExpenseSubCategories.Add(new ExpenseSubCategory { Id = 2, GroupId = 2, Name_en = "Snacks" });
+        await db.SaveChangesAsync();
+
+        var id = await svc.CreateAsync(Reimb(), isFinance: false);
+
+        var edit = CloneToUpdate(Reimb());
+        edit.Lines = new()
+        {
+            new ExpenseLineInput { CategoryGroupId = 1, SubCategoryId = 1, Amount = 10m },
+            new ExpenseLineInput { CategoryGroupId = 2, SubCategoryId = 2, Amount = 5m },
+        };
+        await svc.UpdateAsync(id, edit, isFinance: false);
+
+        Assert.Equal(15m, (await db.Expenses.FindAsync(id))!.Amount);
+        Assert.Equal(2, await db.ExpenseLines.CountAsync(l => l.ExpenseId == id));
     }
 
     [Fact]