Improve parallelism when loading transformer plugins.

sdk/lib/_internal/pub/test/transformers_needed_by_transformers/import_dependencies_test.dart

Index: sdk/lib/_internal/pub/test/transformers_needed_by_transformers/import_dependencies_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformers_needed_by_transformers/import_dependencies_test.dart b/sdk/lib/_internal/pub/test/transformers_needed_by_transformers/import_dependencies_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..342425e6a3d27da8ba46e489bb5f12cd0d1cafd0
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/transformers_needed_by_transformers/import_dependencies_test.dart
@@ -0,0 +1,195 @@
+// 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 pub_tests;
+
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+
+void main() {
+  initConfig();
+
+  integration("reports a dependency if a transformed local file is imported",
+      () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {"foo": {"path": "../foo"}},
+        "transformers": [
+          {"foo": {"\$include": "lib/lib.dart"}},
+          "myapp"
+        ]
+      }),
+      d.dir("lib", [
+        d.file("myapp.dart", ""),
+        d.file("lib.dart", ""),
+        d.file("transformer.dart", transformer(["lib.dart"]))
+      ])
+    ]).create();
+
+    d.dir("foo", [
+      d.pubspec({"name": "foo", "version": "1.0.0"}),
+      d.dir("lib", [d.file("foo.dart", transformer())])
+    ]).create();
+
+    expectDependencies({'myapp': ['foo'], 'foo': []});
+  });
+
+  integration("reports a dependency if a transformed foreign file is imported",
+      () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {"foo": {"path": "../foo"}},
+        "transformers": ["myapp"]
+      }),
+      d.dir("lib", [
+        d.file("myapp.dart", ""),
+        d.file("transformer.dart", transformer(["package:foo/foo.dart"]))
+      ])
+    ]).create();
+
+    d.dir("foo", [
+      d.pubspec({
+        "name": "foo",
+        "version": "1.0.0",
+        "transformers": [{"foo": {"\$include": "lib/foo.dart"}}]
+      }),
+      d.dir("lib", [
+        d.file("foo.dart", ""),
+        d.file("transformer.dart", transformer())
+      ])
+    ]).create();
+
+    expectDependencies({'myapp': ['foo'], 'foo': []});
+  });
+
+  integration("reports a dependency if a transformed external package file is "
+      "imported from an export", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {"foo": {"path": "../foo"}},
+        "transformers": ["myapp"]
+      }),
+      d.dir("lib", [
+        d.file("myapp.dart", ""),
+        d.file("transformer.dart", transformer(["local.dart"])),
+        d.file("local.dart", "export 'package:foo/foo.dart';")
+      ])
+    ]).create();
+
+    d.dir("foo", [
+      d.pubspec({
+        "name": "foo",
+        "version": "1.0.0",
+        "transformers": [{"foo": {"\$include": "lib/foo.dart"}}]
+      }),
+      d.dir("lib", [
+        d.file("foo.dart", ""),
+        d.file("transformer.dart", transformer())
+      ])
+    ]).create();
+
+    expectDependencies({'myapp': ['foo'], 'foo': []});
+  });
+
+  integration("reports a dependency if a transformed foreign file is "
+      "transitively imported", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {"foo": {"path": "../foo"}},
+        "transformers": ["myapp"]
+      }),
+      d.dir("lib", [
+        d.file("myapp.dart", ""),
+        d.file("transformer.dart", transformer(["local.dart"])),
+        d.file("local.dart", "import 'package:foo/foreign.dart';")
+      ])
+    ]).create();
+
+    d.dir("foo", [
+      d.pubspec({
+        "name": "foo",
+        "version": "1.0.0",
+        "transformers": [{"foo": {"\$include": "lib/foo.dart"}}]
+      }),
+      d.dir("lib", [
+        d.file("foo.dart", ""),
+        d.file("transformer.dart", transformer()),
+        d.file("foreign.dart", "import 'foo.dart';")
+      ])
+    ]).create();
+
+    expectDependencies({'myapp': ['foo'], 'foo': []});
+  });
+
+  integration("reports a dependency if a transformed foreign file is "
+      "transitively imported across packages", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {"foo": {"path": "../foo"}},
+        "transformers": ["myapp"]
+      }),
+      d.dir("lib", [
+        d.file("myapp.dart", ""),
+        d.file("transformer.dart", transformer(["package:foo/foo.dart"])),
+      ])
+    ]).create();
+
+    d.dir("foo", [
+      d.pubspec({
+        "name": "foo",
+        "version": "1.0.0",
+        "dependencies": {"bar": {"path": "../bar"}}
+      }),
+      d.dir("lib", [d.file("foo.dart", "import 'package:bar/bar.dart';")])
+    ]).create();
+
+    d.dir("bar", [
+      d.pubspec({
+        "name": "bar",
+        "version": "1.0.0",
+        "transformers": [{"bar": {"\$include": "lib/bar.dart"}}]
+      }),
+      d.dir("lib", [
+        d.file("bar.dart", ""),
+        d.file("transformer.dart", transformer())
+      ])
+    ]).create();
+
+    expectDependencies({'myapp': ['bar'], 'bar': []});
+  });
+
+  integration("reports a dependency if an imported file is transformed by a "
+      "different package", () {
+    d.dir(appPath, [
+      d.pubspec({
+        "name": "myapp",
+        "dependencies": {"foo": {"path": "../foo"}},
+        "transformers": [
+          {"foo": {'\$include': 'lib/local.dart'}},
+          "myapp"
+        ]
+      }),
+      d.dir("lib", [
+        d.file("myapp.dart", ""),
+        d.file("transformer.dart", transformer(["local.dart"])),
+        d.file("local.dart", "")
+      ])
+    ]).create();
+
+    d.dir("foo", [
+      d.pubspec({"name": "foo", "version": "1.0.0"}),
+      d.dir("lib", [d.file("transformer.dart", transformer())])
+    ]).create();
+
+    expectDependencies({'myapp': ['foo'], 'foo': []});
+  });
+}