Reddit reviews Jones Stephens Corporation T31002 Economy 2" Test Plug, Small,
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Molded rubber gasketGalvanized steel flangesFits cast iron and plastic pipe
First thing you'll want to do is test the tile shower pan for integrity. To do that you'll need a 2 inch rubber test ball plug or a 2 inch inside pipe expanding test plug. Examples:
https://www.amazon.com/Jones-Stephens-Corporation-T31002-Economy/dp/B000DZGLN2
https://www.amazon.com/Cherne-270024-Test-Ball-2-Inch-Plug/dp/B000VYNU7A
You'll use those to plug the shower drain completely water tight and then fill to the top of the shower curb. Let is sit like that for 24 hours. Check underneath for visible drips and wet spots. The water level should not drop. If it does, even if you don't see leaks, you almost certainly have one. If so there's nothing for it but to break out the tile and start over. Look on the John Bridge forums or the Tile Council of North America for a thorough run down on the correct way for tile shower pans to be constructed.