Car barely started this morning and now I'm paranoid it'll leave me stranded

Had one of those mornings where you turn the key and instead of that healthy vroom sound you get this sluggish, struggling noise like the engine doesn't want to wake up. Eventually it started after the second try but now I'm sitting at work constantly thinking about whether it'll do the same thing when I'm leaving this evening. Car's a 2015 Mazda, battery is probably about two years old best I can remember, maybe three. Been reading up on Signs your car battery is failing because I'd rather replace it proactively than deal with a no-start situation in some random parking lot after dark. Seems like slow cranking is the main one, which is exactly what happened, plus my headlights did look a bit dimmer than usual when I pulled out of the parking. Anyone know a good place in Sharjah to get the battery tested? Don't wanna just buy a new one if it's something else like the alternator, but also don't wanna be stuck guessing. Just need some peace of mind more than anything.