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

╷
├─ JUnit Platform Suite ✔
├─ JUnit Jupiter ✔
│  └─ DisplayNameTest ✔
│     └─ shouldMultiply(int, int, int) ✔
│        ├─ [1] "3" × "4" = "12" ✔
│        ├─ [2] "0" × "5" = "0" ✔
│        └─ [3] "-2" × "3" = "-6" ✔
└─ JUnit Vintage ✔

Test run finished after 173 ms
[         3 tests successful      ]
[         0 tests failed          ]

name = "[{index}] {0} × {1} = {2}" combines the built-in {index} keyword (the invocation's
1-based position) with the three positional argument placeholders and a literal Unicode
multiplication sign, to produce a display name that reads like the actual arithmetic the test
is checking rather than a generic "[1] 3, 4, 12".