diff --git a/qubes/tests/storage_file.py b/qubes/tests/storage_file.py
index a2a461b6..9742ffa1 100644
--- a/qubes/tests/storage_file.py
+++ b/qubes/tests/storage_file.py
@@ -25,7 +25,10 @@ import shutil
 import asyncio
 import unittest.mock
 
+import subprocess
+
 import qubes.storage
+import qubes.utils
 import qubes.tests.storage
 from qubes.config import defaults
 
@@ -383,6 +386,73 @@ class TC_01_FileVolumes(qubes.tests.QubesTestCase):
             volume_data = volume_file.read().strip('\0')
         self.assertNotEqual(volume_data, 'test data')
 
+    def test_023_resize(self):
+        config = {
+            'name': 'root',
+            'pool': self.POOL_NAME,
+            'rw': True,
+            'save_on_stop': True,
+            'size': 32 * 1024**2,
+        }
+        vm = qubes.tests.storage.TestVM(self)
+        volume = self.app.get_pool(self.POOL_NAME).init_volume(vm, config)
+        qubes.utils.void_coros_maybe([volume.create()])
+        new_size = 64 * 1024 ** 2
+        qubes.utils.void_coros_maybe([volume.resize(new_size)])
+        self.assertEqual(os.path.getsize(volume.path), new_size)
+        self.assertEqual(volume.size, new_size)
+
+    def _get_loop_size(self, path):
+        sudo = [] if os.getuid() == 0 else ['sudo']
+        try:
+            loop_name = subprocess.check_output(
+                sudo + ['losetup', '--associated', path]).decode().split(':')[0]
+            if os.getuid() != 0:
+                return int(
+                    subprocess.check_output(
+                        ['sudo', 'blockdev', '--getsize64', loop_name]))
+            fd = os.open(loop_name, os.O_RDONLY)
+            try:
+                return os.lseek(fd, 0, os.SEEK_END)
+            finally:
+                os.close(fd)
+        except subprocess.CalledProcessError:
+            return None
+
+    def _setup_loop(self, path):
+        sudo = [] if os.getuid() == 0 else ['sudo']
+        loop_name = subprocess.check_output(
+            sudo + ['losetup', '--show', '--find', path]).decode().strip()
+        self.addCleanup(subprocess.call, sudo + ['losetup', '-d', loop_name])
+
+    def test_007_resize_running(self):
+        old_size = 32 * 1024**2
+        config = {
+            'name': 'root',
+            'pool': self.POOL_NAME,
+            'rw': True,
+            'save_on_stop': True,
+            'size': old_size,
+        }
+        vm = qubes.tests.storage.TestVM(self)
+        volume = self.app.get_pool(self.POOL_NAME).init_volume(vm, config)
+        qubes.utils.void_coros_maybe([volume.create()])
+        qubes.utils.void_coros_maybe([volume.start()])
+        self._setup_loop(volume.path)
+        new_size = 64 * 1024 ** 2
+        orig_check_call = subprocess.check_call
+        with unittest.mock.patch('subprocess.check_call') as mock_subprocess:
+            sudo = [] if os.getuid() == 0 else ['sudo']
+            mock_subprocess.side_effect = (lambda *args, **kwargs:
+                orig_check_call(sudo + args[0], *args[1:], **kwargs))
+            qubes.utils.void_coros_maybe([volume.resize(new_size)])
+        self.assertEqual(os.path.getsize(volume.path), new_size)
+        self.assertEqual(self._get_loop_size(volume.path), new_size)
+        self.assertEqual(volume.size, new_size)
+        qubes.utils.void_coros_maybe([volume.stop()])
+        self.assertEqual(os.path.getsize(volume.path), new_size)
+        self.assertEqual(volume.size, new_size)
+
     def assertVolumePath(self, vm, dev_name, expected, rw=True):
         # :pylint: disable=invalid-name
         volumes = vm.volumes