Allow deleting templates

test/database/collections/recurrent.dart

@@ -0,0 +1,38 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:okane/database/collections/recurrent.dart';
+
+void main() {
+  group("isDue", () {
+    test("null value", () {
+      final t = RecurringTransaction()..lastExecution = null;
+      expect(t.isDue(DateTime.now()), true);
+    });
+
+    test("Date before", () {
+      final now = DateTime.now();
+      final t =
+          RecurringTransaction()
+            ..lastExecution = now
+            ..days = 30;
+      expect(t.isDue(now.add(Duration(days: 10))), false);
+    });
+
+    test("Date before warning", () {
+      final now = DateTime.now();
+      final t =
+          RecurringTransaction()
+            ..lastExecution = now
+            ..days = 30;
+      expect(t.isDue(now.add(Duration(days: 20))), true);
+    });
+
+    test("Expired", () {
+      final now = DateTime.now();
+      final t =
+          RecurringTransaction()
+            ..lastExecution = now
+            ..days = 30;
+      expect(t.isDue(now.add(Duration(days: 31))), true);
+    });
+  });
+}