I would recommend buying steel kits,
Not a big difference on price and you can plug pressurized line when needed.
The pressure kits: there’s whole lot of cheap Chinese on eBay and Amazon, not sure about quality but f those. JLG and Hydraulic Supply sell reputable brand kits in $450s. Check out Hydracheck, but I haven’t left ok at their website for long time, so I don’t know the prices.
I built my own kit, bought swivel run tee kits of each standard from Hydracheck, Pressure Connections and Tifco, and plug or cap the tee when I need. Bought genuine Stuff microbore hoses all my stuff is unified to Test20 ( 16x2 mm) test connections.
It was long time ago, now days you can the same stuff on eBay, but I cannot tell you about the quality of it.
BTW Tifco is ridiculously expensive and requires setting up business account to buy anything, but it is very helpful to look through their catalog to learn about different fittings standards and quick connectors used in different brands.