public void InstanceSingleTag(string tag, object value, object newValue)
{
Assert.DoesNotThrow(() => _avroSchema.AddTag(tag, value));
Assert.AreEqual(value, _avroSchema.Tags[tag]);
Assert.DoesNotThrow(() => _avroSchema.RemoveTag(tag));
Assert.IsFalse(_avroSchema.Tags.ContainsKey(tag));
}