Format all tests.

tests/language_strong/nullaware_opt_test.dart

Index: tests/language_strong/nullaware_opt_test.dart
diff --git a/tests/language_strong/nullaware_opt_test.dart b/tests/language_strong/nullaware_opt_test.dart
index aae17b79e14ff2841c0cc9818c422c8c53ced770..1a3ef0990e38baede3c055ac64edd0db96f746fc 100644
--- a/tests/language_strong/nullaware_opt_test.dart
+++ b/tests/language_strong/nullaware_opt_test.dart
@@ -32,7 +32,11 @@ test() {
   Expect.equals(null, c?.v);
   Expect.equals(10, c ?? 10);
   Expect.equals(d, d ?? bomb());
-  Expect.equals(3, [[3]]?.expand((i) => i).toList()[0]);
+  Expect.equals(
+      3,
+      [
+        [3]
+      ]?.expand((i) => i).toList()[0]);
   Expect.equals(null, (null as List<List<int>>)?.expand((i) => i)?.toList());
 
   var e;
@@ -69,4 +73,4 @@ main() {
     test();
     test2();
   }
-}
+}