Extract Function: Add test data

idea/testData/refactoring/extractFunction/controlFlow/outputValues/singleOutputValueWithWhen.kt

@@ -0,0 +1,16 @@
+// NEXT_SIBLING:
+fun foo(a: Int): Int {
+    var b: Int = 1
+
+    <selection> when {
+        a > 0 -> {
+            b = b + 1
+        }
+        a < 0 -> {
+            b = b - 1
+        }
+    }
+    println(b)</selection>
+
+    return b
+}