pkg/smoke: support latest analyzer version and formatted code

test/codegen/common.dart

Index: test/codegen/common.dart
diff --git a/test/codegen/common.dart b/test/codegen/common.dart
index 3afe2e42822e79105e99e353f765162b8bdb4756..7c80d6c194b4bf60a9c4a768b4deddca313ede2a 100644
--- a/test/codegen/common.dart
+++ b/test/codegen/common.dart
@@ -7,9 +7,12 @@ library smoke.test.codegen.common;
 import 'package:smoke/codegen/generator.dart';
 import 'package:unittest/unittest.dart';
 
-checkResults(SmokeCodeGenerator generator, {List<String> imports: const [],
-    String topLevel: '', String initCall}) {
-  var allImports = []..addAll(DEFAULT_IMPORTS)..addAll(imports)..add('');
+checkResults(SmokeCodeGenerator generator,
+    {List<String> imports: const [], String topLevel: '', String initCall}) {
+  var allImports = []
+    ..addAll(DEFAULT_IMPORTS)
+    ..addAll(imports)
+    ..add('');
   var genImports = new StringBuffer();
   generator.writeImports(genImports);
   expect(genImports.toString(), allImports.join('\n'));