Validate packages against their SDK constraints.

utils/tests/pub/test_pub.dart

 // Copyright (c) 2012, 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;
 
@@ skipping 220 matching lines @@
 /// Describes a file named `pubspec.yaml` for an application package with the
 /// given [dependencies].
 Descriptor appPubspec(List dependencies) {
   return pubspec({
     "name": "myapp",
     "dependencies": _dependencyListToMap(dependencies)
   });
 }
 
 /// Describes a file named `pubspec.yaml` for a library package with the given
-/// [name], [version], and [dependencies].
-Descriptor libPubspec(String name, String version, [List dependencies]) =>
-  pubspec(package(name, version, dependencies));
+/// [name], [version], and [deps]. If "sdk" is given, then it adds an SDK
+/// constraint on that version.
+Descriptor libPubspec(String name, String version, {List deps, String sdk}) {
+  var map = package(name, version, deps);
+
+  if (sdk != null) {
+    map["environment"] = {
+      "sdk": sdk
+    };
+  }
+
+  return pubspec(map);
+}
 
 /// Describes a directory named `lib` containing a single dart file named
 /// `<name>.dart` that contains a line of Dart code.
 Descriptor libDir(String name, [String code]) {
   // Default to printing the name if no other code was given.
   if (code == null) {
     code = name;
   }
 
   return dir("lib", [
@@ skipping 201 matching lines @@
 bool _abortScheduled = false;
 
 /// The time (in milliseconds) to wait for the entire scheduled test to
 /// complete.
 final _TIMEOUT = 30000;
 
 /// Defines an integration test. The [body] should schedule a series of
 /// operations which will be run asynchronously.
 void integration(String description, void body()) {
   test(description, () {
+    // Ensure the SDK version is always available.
+    dir(sdkPath, [
+      file('version', '0.1.2.3')
+    ]).scheduleCreate();
+
     // Schedule the test.
     body();
 
     // Run all of the scheduled tasks. If an error occurs, it will propagate
     // through the futures back up to here where we can hand it off to unittest.
     var asyncDone = expectAsync0(() {});
     var createdSandboxDir;
     _setUpSandbox().then((sandboxDir) {
       createdSandboxDir = sandboxDir;
       return timeout(_runScheduled(sandboxDir, _scheduled),
@@ skipping 1075 matching lines @@
 /// calling [completion] is unnecessary.
 void expectLater(Future actual, matcher, {String reason,
     FailureHandler failureHandler, bool verbose: false}) {
   _schedule((_) {
     return actual.then((value) {
       expect(value, matcher, reason: reason, failureHandler: failureHandler,
           verbose: false);
     });
   });
 }