Having all branches in a switch or if chain with the same implementation is an error. Either a copy-paste error was made and something different should be executed, or there shouldn't be a switch/if chain at all. Note that this rule does not apply to if chains without else-s, or to switch-es without default clauses.

Noncompliant Code Example

if (b == 0) {  // Noncompliant
  doOneMoreThing();
}
else {
  doOneMoreThing();
}

int b = a > 12 ? 4 : 4;  // Noncompliant

switch (i) {  // Noncompliant
  case 1:
    doSomething();
    break;
  case 2:
    doSomething();
    break;
  case 3:
    doSomething();
    break;
  default:
    doSomething();
}