Look man, believe what you want. Open a fraud investigation with your bank. I know what I know not only from my own personal experience but also professionally working in banking law and operations. Usually these small phantom charges are never posted, just replaced with the actual charge, and usually it happens in a way that's transparent to customers unless the party making the test authorization is not one recognized as legitimate or rather, is one suspected by the bank as being possibly fraudulent based on past activities or alerts within the industry. The volume of transactions handled by the world financial system staggers the mind and all of this stuff is automated and based on proprietary algorithms that are tweaked based on transaction patterns that change daily or even hourly.
But hey, believe what you want. I only do this stuff for a living.