Reapply "Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors."

tests/lib/mirrors/library_exports_hidden_test.dart

Index: tests/lib/mirrors/library_exports_hidden_test.dart
diff --git a/tests/lib/mirrors/library_exports_hidden_test.dart b/tests/lib/mirrors/library_exports_hidden_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..990dbb109df91c221369cd77d536d0fc5054b5ee
--- /dev/null
+++ b/tests/lib/mirrors/library_exports_hidden_test.dart
@@ -0,0 +1,34 @@
+// Copyright (c) 2014, 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.
+
+library test.library_imports;
+
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+import 'stringify.dart';
+
+import 'library_exports_hidden.dart';
+
+test(MirrorSystem mirrors) {
+  LibraryMirror hidden = mirrors.findLibrary(#library_exports_hidden);
+  LibraryMirror a = mirrors.findLibrary(#library_imports_a);
+  LibraryMirror b = mirrors.findLibrary(#library_imports_b);
+  LibraryMirror core = mirrors.findLibrary(#dart.core);
+
+  Expect.setEquals([a, b, core],
+                   hidden.libraryDependencies.map((dep) => dep.targetLibrary));
+
+  Expect.stringEquals(
+      'import dart.core\n'
+      'export library_imports_a\n'
+      ' hide somethingFromA\n'
+      ' hide somethingFromBoth\n'
+      'export library_imports_b\n'
+      ' hide somethingFromB\n',
+      stringifyDependencies(hidden));
+}
+
+main() {
+  test(currentMirrorSystem());
+}