Adds limited support for private classes.

test_reflectable/test/private_class_test.dart

+// Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
+// source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+/// File being transformed by the reflectable transformer.
+/// Uses public features of an instance of a private class in a different
+/// library. This illustrates that there is (very limited) support for access
+/// to private features.
+library test_reflectable.test.private_class_test;
+
+@GlobalQuantifyCapability("PublicClass", privacyReflectable)
+import 'package:reflectable/reflectable.dart';
+import 'package:unittest/unittest.dart';
+import 'private_class_library.dart';
+
+class PrivacyReflectable extends Reflectable {
+  const PrivacyReflectable()
+      : super(
+            subtypeQuantifyCapability,
+            reflectedTypeCapability,
+            instanceInvokeCapability,
+            declarationsCapability,
+            libraryCapability);
+}
+
+const privacyReflectable = const PrivacyReflectable();
+
+final Set<String> libraryClassNames = <String>[
+  "PublicClass",
+  "_PrivateClass1",
+  "_PrivateClass2",
+  "PublicSubclass1",
+  "PublicSubclass2"
+].toSet();
+
+void testPrivacyViolation(PublicClass object, String description,
+    {bool doReflect: true}) {
+  test("Privacy, $description", () {
+    bool canReflect = privacyReflectable.canReflect(object);
+    expect(canReflect, doReflect);
+    if (canReflect) {
+      // Check that we can reflect upon [object], and that its class
+      // is among the expected ones.
+      InstanceMirror instanceMirror = privacyReflectable.reflect(object);
+      ClassMirror classMirror = instanceMirror.type;
+      expect(libraryClassNames.contains(classMirror.simpleName), true);
+
+      // Browse [object] and call a method declared in a private class.
+      classMirror.declarations.values.forEach((DeclarationMirror declaration) {
+        expect(declaration is MethodMirror, true);
+        MethodMirror method =
+            declaration; // Declaration needed, no type propagation.
+        expect(method.reflectedReturnType, int);
+        expect(method.parameters.length, 0);
+        expect(
+            <String>[
+              "publicMethod",
+              "supposedlyPrivate",
+              "supposedlyPrivateToo"
+            ].contains(method.simpleName),
+            true);
+        if (method.simpleName != "publicMethod") {
+          expect(instanceMirror.invoke(declaration.simpleName, []),
+              -object.publicMethod());
+        }
+      });
+    }
+  });
+}
+
+main() {
+  test("Privacy, libraries", () {
+    // Check that we can browse libraries.
+    Map<Uri, LibraryMirror> libraries = privacyReflectable.libraries;
+    Uri libraryUri = libraries.keys.firstWhere(
+        (Uri uri) => uri.toString().contains("private_class_library"));
+    LibraryMirror library = libraries[libraryUri];
+    expect(library.declarations.keys, libraryClassNames);
+  });
+
+  testPrivacyViolation(func1(), "private subclass", doReflect: false);
+  testPrivacyViolation(func2(), "private subtype", doReflect: false);
+  testPrivacyViolation(func3(), "public subclass of private subclass");
+  testPrivacyViolation(func4(), "public subclass of private subtype");
+}