Add failing test case (because of scalacenter/scalafix#478)

Author: julienrf

input/src/main/scala/fix/Collectionstrawman_v0.scala

@@ -43,7 +43,7 @@ object Collectionstrawman_v0_ArrayBuffer {
 object Collectionstrawman_v0_ArrayAndString {
   def foo(xs: Array[Int], ys: String): Unit = {
     xs.map(x => x + 1)
-    ys.map(c => c.toUpper)
+    ys.map(c => c.toUpper).map(_.toLower)
   }
 }
 

output/src/main/scala/fix/Collectionstrawman_v0.scala

@@ -43,7 +43,7 @@ object Collectionstrawman_v0_ArrayBuffer {
 object Collectionstrawman_v0_ArrayAndString {
   def foo(xs: Array[Int], ys: String): Unit = {
     xs.map(x => x + 1)
-    ys.map(c => c.toUpper)
+    ys.map(c => c.toUpper).map(_.toLower)
   }
 }