Make pub generate .packages file.

test/packages_file_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS d.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 d.file.
+
+import 'descriptor.dart' as d;
+import 'test_pub.dart';
+
+main() {
+  initConfig();
+  forBothPubGetAndUpgrade((command) {
+    integration('.packages file is created', () {
+      servePackages((builder) {
+        builder.serve("foo", "1.2.3",
+            deps: {'baz': '2.2.2'}, contents: [d.dir("lib", [])]);
+        builder.serve("bar", "3.2.1", contents: [d.dir("lib", [])]);
+        builder.serve("baz", "2.2.2",
+            deps: {"bar": "3.2.1"}, contents: [d.dir("lib", [])]);
+      });
+
+      d.appDir({"foo": "1.2.3"}).create();
+
+      pubCommand(command);
+
+      d.dir(appPath, [d.packagesFile({
+          "foo": "1.2.3", "bar": "3.2.1", "baz": "2.2.2", "myapp": "0.0.0"})])
+       .validate();
+    });
+
+    integration('.packages file is overwritten', () {
+      servePackages((builder) {
+        builder.serve("foo", "1.2.3",
+            deps: {'baz': '2.2.2'}, contents: [d.dir("lib", [])]);
+        builder.serve("bar", "3.2.1", contents: [d.dir("lib", [])]);
+        builder.serve("baz", "2.2.2",
+            deps: {"bar": "3.2.1"}, contents: [d.dir("lib", [])]);
+      });
+
+      d.appDir({"foo": "1.2.3"}).create();
+
+      var oldFile = d.dir(appPath, [d.packagesFile({"notFoo": "9.9.9"})]);
+      oldFile.create();
+      oldFile.validate();  // Sanity-check that file was created correctly.
+
+      pubCommand(command);
+
+      d.dir(appPath, [d.packagesFile({
+          "foo": "1.2.3", "bar": "3.2.1", "baz": "2.2.2", "myapp": "0.0.0"})])
+       .validate();
+    });
+
+    integration('.packages file is not created if pub command fails', () {
+      d.appDir({"foo": "1.2.3"}).create();
+
+      pubCommand(command, args: ['--offline'],
+                 error: "Could not find package foo in cache.\n");
+
+      d.dir(appPath, [d.nothing('.packages')]).validate();
+    });
+
+    integration('.packages file has relative path to path dependency', () {
+      servePackages((builder) {
+        builder.serve("foo", "1.2.3",
+            deps: {'baz': 'any'}, contents: [d.dir("lib", [])]);
+        builder.serve("baz", "9.9.9",
+            deps: {}, contents: [d.dir("lib", [])]);
+      });
+
+      d.dir("local_baz", [
+        d.libDir("baz", 'baz 3.2.1'),
+        d.libPubspec("baz", "3.2.1")
+      ]).create();
+
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "dependencies": {},
+          "dependency_overrides": {
+            "baz": {"path": "../local_baz"},
+          }
+        })
+      ]).create();
+
+      pubCommand(command);
+
+      d.dir(appPath, [d.packagesFile({"myapp": "0.0.0",
+                                      "baz": "../local_baz"})]).validate();
+    });
+
+  });
+}