test case for potential overlap in convert_to_null_aware_test

Change-Id: I54a002fc60328eea13e14a57785298f4907e22c3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161460
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Phil Quitslund <[email protected]>

Author: pq

pkg/analysis_server/test/src/services/correction/fix/bulk/convert_to_null_aware_test.dart

@@ -20,18 +20,16 @@ class ConvertToNullAwareTest extends BulkFixProcessorTest {
 
   Future<void> test_singleFile() async {
     await resolveTestUnit('''
-abstract class A {
-  int m();
+class A {
+  int m(int p) => p;
 }
-int f(A a) => null == a ? null : a.m();
-int g(A a) => a == null ? null : a.m();
+int f(A x, A y) => x == null ? null : x.m(y == null ? null : y.m(0));
 ''');
     await assertHasFix('''
-abstract class A {
-  int m();
+class A {
+  int m(int p) => p;
 }
-int f(A a) => a?.m();
-int g(A a) => a?.m();
+int f(A x, A y) => x?.m(y?.m(0));
 ''');
   }
 }