Unit test improvements.

wolverine/a-frame-architecture/FinancialApi.Domain/Aggregates/BalancedJournal.cs

@@ -1,34 +1,40 @@
 using FinancialApi.Domain.Entities;
+using FinancialApi.Domain.Exceptions;
 
 namespace FinancialApi.Domain.Aggregates;
 
 public record BalancedJournal
 {
-    public JournalEntry Entry { get; }
+    public BalancedJournalEntry Entry { get; }
 
-    private BalancedJournal(JournalEntry entry)
+    private BalancedJournal(BalancedJournalEntry entry)
     {
         Entry = entry;
     }
 
     public static BalancedJournal Create(Guid id, string description, DateTimeOffset createdAt, List<JournalLine> lines)
     {
+        if (lines.Count(l => l.Type == EntryType.Debit) == 0)
+        {
+            throw new GaapViolationException($"GAAP Violation: A journal entry needs at least one debit line.");
+        }
+
+        if (lines.Count(l => l.Type == EntryType.Credit) == 0)
+        {
+            throw new GaapViolationException($"A journal entry needs at least one credit line.");
+        }
+
         var debits = lines.Where(l => l.Type == EntryType.Debit)
             .Sum(l => l.Amount);
         var credits = lines.Where(l => l.Type == EntryType.Credit)
             .Sum(l => l.Amount);
 
-        if (debits != credits)
-        {
-            throw new InvalidOperationException(
-                $"GAAP Violation: Total Debits ({debits}) must equal Total Credits ({credits})!"
-            );
-        }
-
-        return new BalancedJournal(new JournalEntry(id, description, createdAt, lines));
+        return debits != credits
+            ? throw new GaapViolationException($"Total Debits ({debits}) must equal Total Credits ({credits})!")
+            : new BalancedJournal(new BalancedJournalEntry(id, description, createdAt, lines));
     }
 
-    public static BalancedJournal CreateReversal(JournalEntry original, string reason, DateTimeOffset now)
+    public static BalancedJournal CreateReversal(BalancedJournalEntry original, string reason, DateTimeOffset now)
     {
         var reversedLines = original.Lines.Select(l =>
                 l with { Type = l.Type == EntryType.Debit ? EntryType.Credit : EntryType.Debit }