Add more tested features to closure_test

pkg/compiler/lib/src/js_model/closure.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../common/tasks.dart';
 import '../constants/expressions.dart';
@@ skipping 164 matching lines @@
 
   @override
   // TODO(efortuna): Eventually capturedScopesMap[node] should always
   // be non-null, and we should just test that with an assert.
   CapturedLoopScope getCapturedLoopScope(ir.Node loopNode) =>
       _capturedScopesMap[loopNode] ?? const CapturedLoopScope();
 
   @override
   ClosureRepresentationInfo getClosureRepresentationInfo(Entity entity) {
     var closure = _closureRepresentationMap[entity];
-    assert(closure != null,
-        "Corresponding closure class not found for $entity. Closures found for ${_closureRepresentationMap.keys}");
+    assert(
+        closure != null,
+        "Corresponding closure class not found for $entity. "
+        "Closures found for ${_closureRepresentationMap.keys}");
     return closure;
   }
+
+  @override
+  ClosureRepresentationInfo getClosureRepresentationInfoForTesting(
+      Entity member) {
+    return _closureRepresentationMap[member];
+  }
 }
 
 class KernelScopeInfo {
   final Set<ir.VariableDeclaration> localsUsedInTryOrSync;
   final bool hasThisLocal;
   final Set<ir.VariableDeclaration> boxedVariables;
   // If boxedVariables is empty, this will be null, because no variables will
   // need to be boxed.
   final NodeBox capturedVariablesAccessor;
 
@@ skipping 316 matching lines @@
   KernelScopeInfo scopeInfo;
 
   /// Collected [CapturedScope] data for nodes.
   Map<ir.Node, KernelCapturedScope> capturedScopesMap =
       <ir.Node, KernelCapturedScope>{};
 
   /// Collected [ScopeInfo] data for nodes.
   Map<ir.FunctionNode, KernelScopeInfo> closuresToGenerate =
       <ir.FunctionNode, KernelScopeInfo>{};
 }