Oh they tooooooootally are, I mean as as product itself. As far as the brand....I am not sure. Most of these company SHOULD have COAs for their products - if you don't know what a COA is it's a comprehensive lab test breaking down essentially all the compounds contained therein. Some are more in depth than others containing tests for residual solvents, heavy meals, pesticides, etc. - It all comes down to the capabilities of the labs out there testing and the analytical standards for the potential testing done so they know what they're even looking for.
BUT.....I do have to say mushroom chocolate bars motherfucking AWESOME. I went to a hash professional meetup that was going on roughly the same time as Cannacon Psych conference out in Miami and they were slanging those OPEN AIR inside there. A few different vendors had them - each with a whole shitton of different brands. Personally, I wouldn't go for a THC/mushroom split bar especially without a COA for a few reasons. Namely these days a lot of people will sell D8 which is a converted cannabinoid made from hemp that will still get you stoned as fuck - I wholesale this stuff and it can be as cheap as 500 bucks a liter, now contrast that with non-hemp derived D9 distillate that is now 4500/L for the current market - which would you go for? Now that's not saying D8 is not a decent cannabinoid that won't get you high as giraffe pussy - It fucking will. BUT. As with any other emerging industry that is only semi regulated there are a lot of lazy labs out there that use sub-par raw ingredients AND are lazy on solvent purging amongst other laboratory processes. You can't always see the facilities the products were made in but reliable COAs that will detail the makeup of the product FROM A REPUTABLE LAB (this is the big thing, a lot of local yokel labs will dilute labs for the right price $$$$$$ ). As far as mushroom analytics....I am not sure if the standards for those exist (analytical standards are what you feed into a gas spec or whatever fucking unit you use to test purity and potency so it has legitimate 'pure' compounds to compare it's basis of ratio/percentage off of). I would totally not be surprised if there is standards out there FOR mushrooms but I am not well versed in what labs provide fungus analytics.
That being said I ate 5g of mushrooms in a chocolate bar that night and was consistently ripping a DMT pen when we went to the strip club. A+ would ebay with this user again. It was a fucking blast. I think it was One up mushroom chocolate bars but if i've learned anything from working in the hemp industry....Packaging is just a piece of fucking cardboard.
As a product as a whole though I do not think THC/psychedelics should be packaged together. If you can get one you know where to get the other and edible THC in itself is a recipe for a fucking panic attack if taken at too high a dosage nevermind if you add fucking MUSHROOMS to the mix. Like what the fuck it almost seems evil now that I think of it. I've been an active participant of the industry pretty much my whole life and edibles will STILL send me into a panic attack and I dab like people smoke cigarettes.