Extract Function: Add test data

idea/testData/refactoring/extractFunction/controlFlow/outputValues/singleOutputValue.kt.after

@@ -0,0 +1,15 @@
+// NEXT_SIBLING:
+fun i(a: Int, b: Int): Int {
+    var b1 = b
+    b1 += a
+    println(b1)
+    return b1
+}
+
+fun foo(a: Int): Int {
+    var b: Int = 1
+
+    b = i(a, b)
+
+    return b
+}