added tests for disconnectAndClear

Author: stevensJourney

packages/powersync/lib/src/streaming_sync.dart

@@ -54,6 +54,7 @@ class StreamingSyncImplementation {
     var invalidCredentials = false;
     while (true) {
       if (abortController?.aborted == true) {
+        abortController!.completeAbort();
         return;
       }
       _updateStatus(connecting: true);

packages/powersync/test/disconnect_test.dart

@@ -0,0 +1,64 @@
+import 'package:powersync/powersync.dart';
+import 'package:test/test.dart';
+import 'streaming_sync_test.dart';
+import 'utils/test_utils_impl.dart';
+import 'watch_test.dart';
+
+final testUtils = TestUtils();
+
+void main() {
+  group('Disconnect Tests', () {
+    late String path;
+
+    setUp(() async {
+      path = testUtils.dbPath();
+      await testUtils.cleanDb(path: path);
+    });
+
+    test('Multiple calls to disconnect', () async {
+      // Start with "offline-only" schema.
+      // This does not record any operations to the crud queue.
+      final db = await testUtils.setupPowerSync(path: path, schema: testSchema);
+
+      credentialsCallback() async {
+        // A blank endpoint will fail, but that's okay for this test
+        final endpoint = '';
+        return PowerSyncCredentials(
+            endpoint: endpoint,
+            token: 'token',
+            userId: 'u1',
+            expiresAt: DateTime.now());
+      }
+
+      db.retryDelay = Duration(milliseconds: 5000);
+      var connector = TestConnector(credentialsCallback);
+      await db.connect(connector: connector);
+
+      // Call disconnect multiple times, each Future should resolve
+      final disconnect1 = db.disconnect();
+      final disconnect2 = db.disconnect();
+
+      await expectLater(disconnect1, completes);
+      await expectLater(disconnect2, completes);
+    });
+
+    test('disconnectAndClear clears DB', () async {
+      // Start with "offline-only" schema.
+      // This does not record any operations to the crud queue.
+      final db = await testUtils.setupPowerSync(path: path, schema: testSchema);
+
+      await db.execute(
+          'INSERT INTO customers (id, name, email) VALUES(uuid(), ?, ?)',
+          ['Steven', 'steven@journeyapps.com']);
+
+      final getCustomersQuery = 'SELECT * from customers';
+      final initialCustomers = await db.getAll(getCustomersQuery);
+      expect(initialCustomers.length, equals(1));
+
+      await db.disconnectAndClear();
+
+      final finalCustomers = await db.getAll(getCustomersQuery);
+      expect(finalCustomers.length, equals(0));
+    });
+  });
+}