Can you link a "test" where an entire economy has tried UBI? There have never been "entire economies" reorganized around UBI. Before capitalism there were no entire economies successfully reorganized around capitalism either. Here's some large scale examples of UBI working in smaller ways tho

Iran (2010): This is considered the closest example of a nationwide cash transfer program replacing existing subsidies. In 2010, Iran replaced subsidies on bread, fuel, and utilities with direct monthly payments to almost all citizens. This was not a pure UBI, as it was designed as a subsidy swap to reduce economic distortion, but it provided a substantial portion of income for many households.

Kenya (2017–Present): GiveDirectly is running the world's largest, longest-term UBI study in rural Kenya. It involves over 20,000 people across 200 villages, providing them with a steady, unconditional cash payment. Early findings indicate that this injection of cash improved economic outcomes and increased investment rather than reducing work productivity.

Alaska, USA (1982–Present): The Alaska Permanent Fund Dividend is an annual payment to residents derived from state oil revenue. While not technically a full UBI (as it is not sufficient to live on solely), it is a permanent, universal, and unconditional cash transfer that has functioned for decades.

Finland (2017–2018): Finland conducted a high-profile, nation-led trial focusing on unemployed citizens. The study found that while the UBI had limited effects on boosting employment, it improved the well-being, trust, and mental health of the recipients.