This is only a visual representation of JUnit 4. The <> enclose the values and [] highlights the differences in the expected and actual strings, they are not part of the input.

From kata description: "The universe is infinite in both the x and y dimensions"

Your gliders are not supposed to glide out of the board.

Same issue on C# VS

Case 14
Expected: 21.25d
But was: 1432.0d
VC Console: 21,25

Case 17:
Expected: 7.7320000000000002d
But was: 179.19999999999999d
VC Console: 7,732

Case 18:
Expected: 7.4562499999999998d
But was: 14.0d
VC Console: 7,45625

Case 19:
Expected: -12042.760875d
But was: 307538640.0d
VC Console: -12042,760875