Having two cases in a switch statement or two branches in an if chain with the same implementation is at best duplicate code, and at worst a coding error. If the same logic is truly needed for both instances, then in an if chain they should be combined, or for a switch, one should fall through to the other.

Noncompliant Code Example

switch i {
case 1:
	doFirstThing()
	doSomething()
case 2:
	doSomethingElse()
case 3: // Noncompliant; duplicates case 1's implementation
	doFirstThing()
	doSomething()
default:
	doTheRest()
}

if a >= 0 && a < 10 {
	doFirstThing()
	doSomething()
} else if a >= 10 && a < 20 {
	doSomethingElse()
} else if a >= 20 && a < 50 {
	doFirstThing()
	doSomething() // Noncompliant; duplicates first condition
} else {
	doTheRest()
}

Exceptions

Blocks in an if chain or case blocks that contain a single line of code are ignored.

if a == 1 {
  doSomething()  //no issue, usually this is done on purpose to increase the readability
} else if a == 2 {
  doSomethingElse()
} else {
  doSomething()
}