Downwards closure inference

lib/src/testing.dart

Index: lib/src/testing.dart
diff --git a/lib/src/testing.dart b/lib/src/testing.dart
index f757930e5ccc6dd937206f1aa3813fa7fba5de44..b0014a5692c51c41460b8b297797ca613e568d0a 100644
--- a/lib/src/testing.dart
+++ b/lib/src/testing.dart
@@ -55,7 +55,8 @@ CheckerResults testChecker(Map<String, String> testFiles,
     inferDownwards: RulesOptions.inferDownwardsDefault,
     inferFromOverrides: ResolverOptions.inferFromOverridesDefault,
     inferTransitively: ResolverOptions.inferTransitivelyDefault,
-    nonnullableTypes: TypeOptions.NONNULLABLE_TYPES}) {
+    nonnullableTypes: TypeOptions.NONNULLABLE_TYPES,
+    wrapClosures: RulesOptions.wrapClosuresDefault}) {
   expect(testFiles.containsKey('/main.dart'), isTrue,
       reason: '`/main.dart` is missing in testFiles');
 
@@ -69,6 +70,7 @@ CheckerResults testChecker(Map<String, String> testFiles,
       inferFromOverrides: inferFromOverrides,
       inferTransitively: inferTransitively,
       nonnullableTypes: nonnullableTypes,
+      wrapClosures: wrapClosures,
       useMockSdk: sdkDir == null,
       dartSdkPath: sdkDir,
       runtimeDir: '/dev_compiler_runtime/',