How to test a carburetor for leaks?

I just took out my carburetor on my 1984 honda magna it has 4 so I cleaned all the bowls and jets but now I want to make sure the bowls don't leak because they did on my gs500 and it isn't the easiest to put this carb in and take it out repetitively. So I put gas into the fuel hole but it didn't fill the bowls how can I figure this out?

Attach an external fuel supply to the fuel inlet.
https://www.denniskirk.com/motion-pro/auxiliary-fuel-tank.ph28608.prd/H28608.sku

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