tests(infra.tests): added builder classes for creating test entities

tests/FiscalOS.Infra.Tests/Data/TransactionMetadataBuilder.cs

@@ -0,0 +1,26 @@
+namespace FiscalOS.Infra.Tests.Data;
+
+internal sealed class TransactionMetadataBuilder
+{
+  private string _plaidId = "plaidId";
+
+  private TransactionMetadataBuilder()
+  {
+  }
+
+  public static TransactionMetadataBuilder Create()
+  {
+    return new();
+  }
+
+  public TransactionMetadataBuilder WithPlaidId(string plaidId)
+  {
+    _plaidId = plaidId;
+    return this;
+  }
+
+  public PlaidTransactionMetadata Build()
+  {
+    return PlaidTransactionMetadata.From(_plaidId);
+  }
+}