public void MetaUnset_Ok()
{
using var area = new TestArea("metaUnsetOkTest");
DroneDB.Init(area.TestFolder);
var f = Path.Join(area.TestFolder, "test.txt");
File.WriteAllText(f, null);
DroneDB.Add(area.TestFolder, f);
DroneDB.MetaSet(area.TestFolder, "abc", "[1,2,3]");
DroneDB.MetaUnset(area.TestFolder, "abc", f).Should().Be(0);
DroneDB.MetaUnset(area.TestFolder, "abc").Should().Be(1);
DroneDB.MetaUnset(area.TestFolder, "abc").Should().Be(0);
}