tests: Check storage is cleared if device does not support listing

On the first enroll, the storage must be cleared. Check that this is the
case for the first enroll but not the second.

tests/fprintd.py

@@ -1047,6 +1047,41 @@ class FPrintdVirtualStorageDeviceTests(FPrintdVirtualStorageDeviceBaseTest):
             self.assertIn({'scan-type': scan_type}, self._changed_properties)
             self.assertEqual(self.device.get_cached_property('scan-type').unpack(), scan_type)
 
+class FPrintdVirtualStorageNoListDeviceTests(FPrintdVirtualStorageDeviceBaseTest):
+
+    socket_env = 'FP_VIRTUAL_DEVICE_STORAGE_NO_LIST'
+
+    def setUp(self):
+        super().setUp()
+        self.device.Claim('(s)', 'testuser')
+
+    def tearDown(self):
+        self.try_release()
+        super().tearDown()
+
+    def test_clear_storage(self):
+        # We expect collection in this order
+        garbage_collect = [
+            'no-metadata-print',
+            'FP1-20201216-7-ABCDEFGH-testuser',
+            'FP1-20201217-7-12345678-testuser',
+        ]
+        for e in garbage_collect:
+            self.send_command('INSERT', e)
+
+        # Enroll print, return OK for storage clearing
+        self.send_command('CONT', 0)
+        self.enroll_print('print-1', 'left-index-finger')
+
+        prints = self.get_stored_prints()
+        self.assertEqual(set(prints), {'print-1'})
+
+        self.enroll_print('print-2', 'right-index-finger')
+
+        prints = self.get_stored_prints()
+        self.assertEqual(set(prints), {'print-1', 'print-2'})
+
+
 class FPrintdVirtualNoStorageDeviceBaseTest(FPrintdVirtualStorageDeviceBaseTest):
 
     socket_env = 'FP_VIRTUAL_DEVICE'