Verify random battle and capture routines against the original engine

tests/capture.test.ts

@@ -40,8 +40,8 @@ describe("catch rate formula", () => {
     expect(rate({ held: { effect: C.HELD_CATCH_CHANCE, parameter: 5 } })).toBe(90);
     // Max HP 400: the low bytes wrap, so a full-HP Pokémon gets 67, not 85.
     expect(rate({ hp: 400, maxHp: 400 })).toBe(67);
-    // Max HP 342 divides by zero in the original.
-    expect(rate({ hp: 342, maxHp: 342 })).toBeUndefined();
+    // These maximum HP values divide by zero in the original.
+    for (const maxHp of [342, 683]) expect(rate({ hp: maxHp, maxHp })).toBeUndefined();
   });
 });