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packages/analyzer/test/source/package_map_resolver_test.dart

Index: packages/analyzer/test/source/package_map_resolver_test.dart
diff --git a/packages/analyzer/test/source/package_map_resolver_test.dart b/packages/analyzer/test/source/package_map_resolver_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..caf88da0b4f9f3cff2cfce4e1cfd9fc71582d2c8
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+++ b/packages/analyzer/test/source/package_map_resolver_test.dart
@@ -0,0 +1,237 @@
+// 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.source.package_map_resolver;
+
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:path/path.dart';
+import 'package:unittest/unittest.dart';
+
+import '../reflective_tests.dart';
+import '../utils.dart';
+
+main() {
+  initializeTestEnvironment();
+  runReflectiveTests(_PackageMapUriResolverTest);
+}
+
+@reflectiveTest
+class _PackageMapUriResolverTest {
+  static const Map EMPTY_MAP = const <String, List<Folder>>{};
+  MemoryResourceProvider provider = new MemoryResourceProvider();
+
+  void test_isPackageUri() {
+    Uri uri = Uri.parse('package:test/test.dart');
+    expect(uri.scheme, 'package');
+    expect(PackageMapUriResolver.isPackageUri(uri), isTrue);
+  }
+
+  void test_isPackageUri_null_scheme() {
+    Uri uri = Uri.parse('foo.dart');
+    expect(uri.scheme, '');
+    expect(PackageMapUriResolver.isPackageUri(uri), isFalse);
+  }
+
+  void test_isPackageUri_other_scheme() {
+    Uri uri = Uri.parse('memfs:/foo.dart');
+    expect(uri.scheme, 'memfs');
+    expect(PackageMapUriResolver.isPackageUri(uri), isFalse);
+  }
+
+  void test_new_null_packageMap() {
+    expect(() {
+      new PackageMapUriResolver(provider, null);
+    }, throws);
+  }
+
+  void test_new_null_resourceProvider() {
+    expect(() {
+      new PackageMapUriResolver(null, <String, List<Folder>>{});
+    }, throws);
+  }
+
+  void test_resolve_multiple_folders() {
+    const pkgFileA = '/part1/lib/libA.dart';
+    const pkgFileB = '/part2/lib/libB.dart';
+    provider.newFile(pkgFileA, 'library lib_a');
+    provider.newFile(pkgFileB, 'library lib_b');
+    PackageMapUriResolver resolver =
+        new PackageMapUriResolver(provider, <String, List<Folder>>{
+      'pkg': [
+        provider.getResource('/part1/lib/'),
+        provider.getResource('/part2/lib/')
+      ]
+    });
+    {
+      Uri uri = Uri.parse('package:pkg/libA.dart');
+      Source result = resolver.resolveAbsolute(uri);
+      expect(result, isNotNull);
+      expect(result.exists(), isTrue);
+      expect(result.uriKind, UriKind.PACKAGE_URI);
+      expect(result.fullName, pkgFileA);
+    }
+    {
+      Uri uri = Uri.parse('package:pkg/libB.dart');
+      Source result = resolver.resolveAbsolute(uri);
+      expect(result, isNotNull);
+      expect(result.exists(), isTrue);
+      expect(result.uriKind, UriKind.PACKAGE_URI);
+      expect(result.fullName, pkgFileB);
+    }
+  }
+
+  void test_resolve_nonPackage() {
+    UriResolver resolver = new PackageMapUriResolver(provider, EMPTY_MAP);
+    Uri uri = Uri.parse('dart:core');
+    Source result = resolver.resolveAbsolute(uri);
+    expect(result, isNull);
+  }
+
+  void test_resolve_OK() {
+    const pkgFileA = '/pkgA/lib/libA.dart';
+    const pkgFileB = '/pkgB/lib/libB.dart';
+    provider.newFile(pkgFileA, 'library lib_a;');
+    provider.newFile(pkgFileB, 'library lib_b;');
+    PackageMapUriResolver resolver =
+        new PackageMapUriResolver(provider, <String, List<Folder>>{
+      'pkgA': [provider.getResource('/pkgA/lib/')],
+      'pkgB': [provider.getResource('/pkgB/lib/')]
+    });
+    {
+      Uri uri = Uri.parse('package:pkgA/libA.dart');
+      Source result = resolver.resolveAbsolute(uri);
+      expect(result, isNotNull);
+      expect(result.exists(), isTrue);
+      expect(result.uriKind, UriKind.PACKAGE_URI);
+      expect(result.fullName, pkgFileA);
+    }
+    {
+      Uri uri = Uri.parse('package:pkgB/libB.dart');
+      Source result = resolver.resolveAbsolute(uri);
+      expect(result, isNotNull);
+      expect(result.exists(), isTrue);
+      expect(result.uriKind, UriKind.PACKAGE_URI);
+      expect(result.fullName, pkgFileB);
+    }
+  }
+
+  void test_resolve_package_invalid_leadingSlash() {
+    UriResolver resolver = new PackageMapUriResolver(provider, EMPTY_MAP);
+    Uri uri = Uri.parse('package:/foo');
+    Source result = resolver.resolveAbsolute(uri);
+    expect(result, isNull);
+  }
+
+  void test_resolve_package_invalid_noSlash() {
+    UriResolver resolver = new PackageMapUriResolver(provider, EMPTY_MAP);
+    Uri uri = Uri.parse('package:foo');
+    Source result = resolver.resolveAbsolute(uri);
+    expect(result, isNull);
+  }
+
+  void test_resolve_package_invalid_onlySlash() {
+    UriResolver resolver = new PackageMapUriResolver(provider, EMPTY_MAP);
+    Uri uri = Uri.parse('package:/');
+    Source result = resolver.resolveAbsolute(uri);
+    expect(result, isNull);
+  }
+
+  void test_resolve_package_notInMap() {
+    UriResolver resolver = new PackageMapUriResolver(provider, EMPTY_MAP);
+    Uri uri = Uri.parse('package:analyzer/analyzer.dart');
+    Source result = resolver.resolveAbsolute(uri);
+    expect(result, isNotNull);
+    expect(result.exists(), isFalse);
+    expect(result.fullName, 'analyzer.dart');
+    expect(result.uri.toString(), 'package:analyzer/analyzer.dart');
+  }
+
+  void test_restoreAbsolute() {
+    const pkgFileA = '/pkgA/lib/libA.dart';
+    const pkgFileB = '/pkgB/lib/src/libB.dart';
+    provider.newFile(pkgFileA, 'library lib_a;');
+    provider.newFile(pkgFileB, 'library lib_b;');
+    PackageMapUriResolver resolver =
+        new PackageMapUriResolver(provider, <String, List<Folder>>{
+      'pkgA': [provider.getResource('/pkgA/lib/')],
+      'pkgB': [provider.getResource('/pkgB/lib/')]
+    });
+    {
+      Source source = _createFileSource('/pkgA/lib/libA.dart');
+      Uri uri = resolver.restoreAbsolute(source);
+      expect(uri, isNotNull);
+      expect(uri.toString(), 'package:pkgA/libA.dart');
+    }
+    {
+      Source source = _createFileSource('/pkgB/lib/src/libB.dart');
+      Uri uri = resolver.restoreAbsolute(source);
+      expect(uri, isNotNull);
+      expect(uri.toString(), 'package:pkgB/src/libB.dart');
+    }
+    {
+      Source source = _createFileSource('/no/such/file');
+      Uri uri = resolver.restoreAbsolute(source);
+      expect(uri, isNull);
+    }
+  }
+
+  void test_restoreAbsolute_ambiguous() {
+    const file1 = '/foo1/lib/bar.dart';
+    const file2 = '/foo2/lib/bar.dart';
+    provider.newFile(file1, 'library bar');
+    provider.newFile(file2, 'library bar');
+    PackageMapUriResolver resolver =
+        new PackageMapUriResolver(provider, <String, List<Folder>>{
+      'foo': [
+        provider.getResource('/foo1/lib'),
+        provider.getResource('/foo2/lib')
+      ]
+    });
+    // Restoring file1 should yield a package URI, and that package URI should
+    // resolve back to file1.
+    Source source1 = _createFileSource(file1);
+    Uri uri1 = resolver.restoreAbsolute(source1);
+    expect(uri1.toString(), 'package:foo/bar.dart');
+    expect(resolver.resolveAbsolute(uri1).fullName, file1);
+    // Restoring file2 should not yield a package URI, because there is no URI
+    // that resolves to file2.
+    Source source2 = _createFileSource(file2);
+    expect(resolver.restoreAbsolute(source2), isNull);
+  }
+
+  void test_restoreAbsolute_longestMatch() {
+    const file1 = '/foo1/bar1/lib.dart';
+    const file2 = '/foo2/bar2/lib.dart';
+    provider.newFile(file1, 'library lib');
+    provider.newFile(file2, 'library lib');
+    PackageMapUriResolver resolver =
+        new PackageMapUriResolver(provider, <String, List<Folder>>{
+      'pkg1': [
+        provider.getResource('/foo1'),
+        provider.getResource('/foo2/bar2')
+      ],
+      'pkg2': [
+        provider.getResource('/foo1/bar1'),
+        provider.getResource('/foo2')
+      ]
+    });
+    // Restoring file1 should yield a package URI for pkg2, since pkg2's match
+    // for the file path (/foo1/bar1) is longer than pkg1's match (/foo1).
+    Source source1 = _createFileSource(file1);
+    Uri uri1 = resolver.restoreAbsolute(source1);
+    expect(uri1.toString(), 'package:pkg2/lib.dart');
+    // Restoring file2 should yield a package URI for pkg1, since pkg1's match
+    // for the file path (/foo2/bar2) is longer than pkg2's match (/foo2).
+    Source source2 = _createFileSource(file2);
+    Uri uri2 = resolver.restoreAbsolute(source2);
+    expect(uri2.toString(), 'package:pkg1/lib.dart');
+  }
+
+  Source _createFileSource(String path) {
+    return new NonExistingSource(path, toUri(path), UriKind.FILE_URI);
+  }
+}