Initial LibraryBundleCache implementation.

pkg/analyzer/test/src/summary/incremental_cache_test.dart

+// Copyright (c) 2016, 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:analyzer/file_system/file_system.dart';
+import 'package:analyzer/src/summary/idl.dart';
+import 'package:analyzer/src/summary/incremental_cache.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../reflective_tests.dart';
+import '../abstract_single_unit.dart';
+
+main() {
+  groupSep = ' | ';
+  runReflectiveTests(LibraryBundleCacheTest);
+}
+
+/**
+ * TODO(scheglov) write more tests for invalidation.
+ */
+@reflectiveTest
+class LibraryBundleCacheTest extends AbstractSingleUnitTest {
+  Folder cacheFolder;
+  LibraryBundleCache cache;
+
+  @override
+  void setUp() {
+    super.setUp();
+    cacheFolder = resourceProvider.newFolder('/cache');
+    cache = new LibraryBundleCache(cacheFolder, context, <int>[]);
+  }
+
+  void test_readBundle_emptyCache() {
+    resolveTestUnit('main() {}');
+    // the cache is empty, no bundle
+    PackageBundle bundle = cache.readBundle(testSource);
+    expect(bundle, isNull);
+  }
+
+  void test_readBundle_importSdk() {
+    resolveTestUnit(r'''
+import 'dart:async';
+main() {}
+''');
+    cache.putLibrary(testLibraryElement);
+    // has bundle
+    PackageBundle bundle = cache.readBundle(testSource);
+    expect(bundle, isNotNull);
+  }
+
+  void test_readBundle_importLib() {
+    addSource('/a.dart', '// 1');
+    resolveTestUnit(r'''
+import 'a.dart';
+main() {}
+''');
+    cache.putLibrary(testLibraryElement);
+    // has bundle
+    expect(cache.readBundle(testSource), isNotNull);
+    // update a.dart, no bundle
+    cache.clearInternalCaches();
+    resourceProvider.updateFile('/a.dart', '// 2');
+    expect(cache.readBundle(testSource), isNull);
+  }
+
+  void test_readBundle_withoutDependencies() {
+    resolveTestUnit('main() {}');
+    cache.putLibrary(testLibraryElement);
+    // has bundle
+    PackageBundle bundle = cache.readBundle(testSource);
+    expect(bundle, isNotNull);
+  }
+}