support/testing: fs/ext: add a negative test for the "extent" feature

We only have a positive test for it, in ext4. Let's have a negative
one as well.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

support/testing/tests/fs/test_ext.py

@@ -86,6 +86,7 @@ BR2_TARGET_ROOTFS_EXT2_3=y
         out = dumpe2fs_run(self.builddir, "rootfs.ext3")
         self.assertEqual(dumpe2fs_getprop(out, REVISION_PROP), "1 (dynamic)")
         self.assertIn("has_journal", dumpe2fs_getprop(out, FEATURES_PROP))
+        self.assertNotIn("extent", dumpe2fs_getprop(out, FEATURES_PROP))
 
         exit_code = boot_img_and_check_fs_type(self.emulator,
                                                self.builddir, "ext3")