Global Testfire starts yesterday 24th March, 2017, and will run throought the weekend. The app is available to download on Nintendo Switch now.
You can grab the application from the Switch eShop, though until the event starts, booting the game up will just give you the following message: “The Splatoon 2 Global Testfire hasn’t started yet.”
Available in the Splatoon 2 demo will be four main weapons, as well as “remixed” versions of the Splat Roller and Splat Charger.
The full Splatoon 2 launches for Switch this summer. It supports Joy-Con controllers, the Pro Controller, and is compatible with both TV and handheld modes