extract resource path test utils

pkg/analyzer/test/source/embedder_test.dart

Index: pkg/analyzer/test/source/embedder_test.dart
diff --git a/pkg/analyzer/test/source/embedder_test.dart b/pkg/analyzer/test/source/embedder_test.dart
index eecb8181b4d72fb58dee614cc6b82823957a6568..448fdb00668b0053ecb8c345ce40b71513582e39 100644
--- a/pkg/analyzer/test/source/embedder_test.dart
+++ b/pkg/analyzer/test/source/embedder_test.dart
@@ -10,10 +10,10 @@ import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/embedder.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/util/absolute_path.dart';
 import 'package:path/path.dart' as path;
 import 'package:unittest/unittest.dart';
 
+import '../resource_utils.dart';
 import '../utils.dart';
 
 main() {
@@ -163,115 +163,3 @@ clearResourceProvider() {
   resourceProvider = null;
   pathTranslator = null;
 }
-
-// TODO(danrubel) if this approach works well for running tests
-// in a platform specific way, then move all of the following functionality
-// into a separate test utility library.
-
-bool get isWindows => path.Style.platform == path.Style.windows;
-
-/**
- * Assert that the given path is posix.
- */
-void expectAbsolutePosixPath(String posixPath) {
-  expect(posixPath, startsWith('/'),
-      reason: 'Expected absolute posix path, but found $posixPath');
-}
-
-/**
- * Translate the given posixPath to a path appropriate for the
- * platform on which the tests are executing.
- */
-String posixToOSPath(String posixPath) {
-  expectAbsolutePosixPath(posixPath);
-  if (isWindows) {
-    String windowsPath = posixPath.replaceAll('/', '\\');
-    if (posixPath.startsWith('/')) {
-      return 'C:$windowsPath';
-    }
-    return windowsPath;
-  }
-  return posixPath;
-}
-
-/**
- * Translate the given posixPath to a file URI appropriate for the
- * platform on which the tests are executing.
- */
-String posixToOSFileUri(String posixPath) {
-  expectAbsolutePosixPath(posixPath);
-  return isWindows ? 'file:///C:$posixPath' : 'file://$posixPath';
-}
-
-/**
- * A convenience utility for setting up a test [MemoryResourceProvider].
- * All supplied paths are assumed to be in [path.posix] format
- * and are automatically translated to [path.context].
- *
- * This class intentionally does not implement [ResourceProvider]
- * directly or indirectly so that it cannot be used as a resource provider.
- * We do not want functionality under test to interact with a resource provider
- * that automatically translates paths.
- */
-class TestPathTranslator {
-  final MemoryResourceProvider _provider;
-
-  TestPathTranslator(this._provider);
-
-  Resource getResource(String posixPath) =>
-      _provider.getResource(posixToOSPath(posixPath));
-
-  File newFile(String posixPath, String content) =>
-      _provider.newFile(posixToOSPath(posixPath), content);
-
-  Folder newFolder(String posixPath) =>
-      _provider.newFolder(posixToOSPath(posixPath));
-}
-
-/**
- * A resource provider for testing that asserts that any supplied paths
- * are appropriate for the OS platform on which the tests are running.
- */
-class TestResourceProvider implements ResourceProvider {
-  final ResourceProvider _provider;
-
-  TestResourceProvider(this._provider) {
-    expect(_provider.absolutePathContext.separator, isWindows ? '\\' : '/');
-  }
-
-  @override
-  AbsolutePathContext get absolutePathContext => _provider.absolutePathContext;
-
-  @override
-  File getFile(String path) => _provider.getFile(_assertPath(path));
-
-  @override
-  Folder getFolder(String path) => _provider.getFolder(_assertPath(path));
-
-  @override
-  Resource getResource(String path) => _provider.getResource(_assertPath(path));
-
-  @override
-  Folder getStateLocation(String pluginId) =>
-      _provider.getStateLocation(pluginId);
-
-  @override
-  path.Context get pathContext => _provider.pathContext;
-
-  /**
-   * Assert that the given path is valid for the OS platform on which the
-   * tests are running.
-   */
-  String _assertPath(String path) {
-    if (isWindows) {
-      if (path.contains('/')) {
-        fail('Expected windows path, but found: $path');
-      }
-    } else {
-      if (path.contains('\\')) {
-        fail('Expected posix path, but found: $path');
-      }
-    }
-    return path;
-  }
-}