Better test

idea/testData/codeInsight/overrideImplement/genericSuperClass.kt.after

@@ -1,5 +1,5 @@
 abstract class X : java.util.ArrayList<String>(), Runnable {
-    override fun size(): Int {
-        <selection><caret>return super.size()</selection>
+    override fun iterator(): MutableIterator<String> {
+        <selection><caret>return super.iterator()</selection>
     }
 }

idea/tests/org/jetbrains/kotlin/idea/codeInsight/OverrideImplementTest.kt

@@ -225,7 +225,7 @@ public class OverrideImplementTest : AbstractOverrideImplementTest() {
     }
 
     public fun testGenericSuperClass() {
-        doOverrideFileTest("size")
+        doOverrideFileTest("iterator")
     }
 
     public fun testDuplicatedAnyMembersBug() {