Add regression test for #1442

moor/test/integration_tests/regress_1442_test.dart

@@ -0,0 +1,39 @@
+@TestOn('vm')
+import 'dart:async';
+
+import 'package:test/test.dart';
+import 'package:moor/ffi.dart';
+import 'package:moor/moor.dart';
+
+class _TestDb extends GeneratedDatabase {
+  _TestDb() : super(const SqlTypeSystem.withDefaults(), VmDatabase.memory());
+  @override
+  final List<TableInfo> allTables = const [];
+  @override
+  final int schemaVersion = 1;
+}
+
+Future<int> _selectOne(_TestDb _db) =>
+    _db.customSelect('select 1 a').map((row) => row.read<int>('a')).getSingle();
+
+void main() {
+  for (final useTransaction in [false, true]) {
+    test('query after db.close, useTransaction=$useTransaction', () async {
+      final db = _TestDb();
+      expect(await _selectOne(db), 1);
+      await db.close();
+
+      expect(
+        () async {
+          if (useTransaction) {
+            await db.transaction(() => _selectOne(db));
+          } else {
+            await _selectOne(db);
+          }
+        },
+        throwsA(isA<StateError>().having((e) => e.message, 'message',
+            contains("Can't re-open a database after closing it."))),
+      );
+    });
+  }
+}