Captured from a real `junit-platform-console-standalone --details=tree` run against
FieldSourceTest, compiled and executed for real.

╷
├─ JUnit Platform Suite ✔
├─ JUnit Jupiter ✔
│  └─ FieldSourceTest ✔
│     └─ shouldRecognizeIsoCurrencyCode(String) ✔
│        ├─ ISO code "USD" should be recognized ✔
│        ├─ ISO code "EUR" should be recognized ✔
│        ├─ ISO code "GBP" should be recognized ✔
│        ├─ ISO code "JPY" should be recognized ✔
│        ├─ ISO code "INR" should be recognized ✔
│        ├─ ISO code "AUD" should be recognized ✔
│        └─ ISO code "CHF" should be recognized ✔
└─ JUnit Vintage ✔

Test run finished after 217 ms
[         7 tests successful      ]
[         0 tests failed          ]

@FieldSource reads its arguments straight from a static field rather than a method or inline
literals -- here FieldSourceTest's own static VALID_ISO_CODES field, which is kept in lock-step
with the real Set CurrencyService.isValidCode checks against, so the seven invocations above are
exactly the seven codes the real service recognizes.