Support loading transformer plugins from pub.

sdk/lib/_internal/pub/test/test_pub.dart

 // Copyright (c) 2013, 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.
 
 /// Test infrastructure for testing pub. Unlike typical unit tests, most pub
 /// tests are integration tests that stage some stuff on the file system, run
 /// pub, and then validate the results. This library provides an API to build
 /// tests like that.
 library test_pub;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
 
 import 'package:http/testing.dart';
 import 'package:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_process.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:unittest/compact_vm_config.dart';
+import 'package:yaml/yaml.dart';
 
 import '../lib/src/entrypoint.dart';
 // TODO(rnystrom): Using "gitlib" as the prefix here is ugly, but "git" collides
 // with the git descriptor method. Maybe we should try to clean up the top level
 // scope a bit?
 import '../lib/src/git.dart' as gitlib;
 import '../lib/src/http.dart';
 import '../lib/src/io.dart';
+import '../lib/src/lock_file.dart';
 import '../lib/src/log.dart' as log;
+import '../lib/src/package.dart';
 import '../lib/src/safe_http_server.dart';
 import '../lib/src/system_cache.dart';
 import '../lib/src/utils.dart';
 import '../lib/src/validator.dart';
+import '../lib/src/version.dart';
 import 'descriptor.dart' as d;
 
 /// This should be called at the top of a test file to set up an appropriate
 /// test configuration for the machine running the tests.
 initConfig() {
   useCompactVMConfiguration();
   filterStacks = true;
   unittestConfiguration.timeout = null;
 }
 
@@ skipping 549 matching lines @@
 
   schedule(() {
     return gitlib.isInstalled.then((installed) {
       if (installed) return;
       if (runningOnBuildbot) return;
       currentSchedule.abort();
     });
   }, 'ensuring that Git is installed');
 }
 
+/// Create a lock file for [package] without running `pub install`.
+///
+/// This creates a lock file with only path dependencies. [dependencies] is a
+/// map of dependency names to paths. [pkg] is a list of packages in the Dart
+/// repo's "pkg" directory; each package listed here and all its dependencies
+/// will be linked to the version in the Dart repo.
+void createLockFile(String package, Map<String, String> dependencies,
+    {Iterable<String> pkg}) {
+  if (pkg != null) {
+    var pkgDir = path.absolute(path.join(
+        path.dirname(Platform.executable),
+        '..', '..', '..', '..', 'pkg'));
+
+    _addPackage(String package) {
+      if (dependencies.containsKey(package)) return;
+      var packagePath = path.join(pkgDir, package);
+      dependencies[package] = packagePath;
+      var pubspec = loadYaml(
+          readTextFile(path.join(packagePath, 'pubspec.yaml')));
+      var packageDeps = pubspec['dependencies'];
+      if (packageDeps == null) return;
+      packageDeps.keys.forEach(_addPackage);
+    }
+
+    pkg.forEach(_addPackage);
+  }
+
+  var lockFile = new LockFile.empty();
+  dependencies.forEach((name, dependencyPath) {
+    var id = new PackageId(name, 'path', new Version(0, 0, 0), {
+      'path': dependencyPath,
+      'relative': path.isRelative(dependencyPath)
+    });
+    lockFile.packages[name] = id;
+  });
+  d.file(path.join(package, 'pubspec.lock'), lockFile.serialize()).create();
+}
+
 /// Use [client] as the mock HTTP client for this test.
 ///
 /// Note that this will only affect HTTP requests made via http.dart in the
 /// parent process.
 void useMockClient(MockClient client) {
   var oldInnerClient = httpClient.inner;
   httpClient.inner = client;
   currentSchedule.onComplete.schedule(() {
     httpClient.inner = oldInnerClient;
   }, 'de-activating the mock client');
@@ skipping 172 matching lines @@
   bool matches(item, Map matchState) {
     if (item is! Pair) return false;
     return _firstMatcher.matches(item.first, matchState) &&
         _lastMatcher.matches(item.last, matchState);
   }
 
   Description describe(Description description) {
     description.addAll("(", ", ", ")", [_firstMatcher, _lastMatcher]);
   }
 }