Reorganize the dart2js transformer tests.

sdk/lib/_internal/pub/test/transformer/dart2js/does_not_support_invalid_environment_type_test.dart

Index: sdk/lib/_internal/pub/test/transformer/dart2js/does_not_support_invalid_environment_type_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/does_not_support_invalid_environment_type_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/does_not_support_invalid_environment_type_test.dart
deleted file mode 100644
index c79af336894a9772bb3aaaed6725f729a3e1c9ee..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/transformer/dart2js/does_not_support_invalid_environment_type_test.dart
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright (c) 2013, 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 file.
-
-library pub_tests;
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-import '../../serve/utils.dart';
-
-main() {
-  initConfig();
-
-  integration("doesn't support invalid environment type", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": [{
-          "\$dart2js": {
-            "environment": "foo",
-          }
-        }]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", REWRITE_TRANSFORMER)
-      ])]),
-      d.dir("web", [d.file("main.dart", "void main() {}")])
-    ]).create();
-
-    createLockFile('myapp', pkg: ['barback']);
-
-    var server = pubServe();
-    // Make a request first to trigger compilation.
-    requestShould404("main.dart.js");
-    server.stderr.expect(emitsLines(
-        'Build error:\n'
-        'Transform Dart2JS on myapp|web/main.dart threw error: '
-            'FormatException: Invalid value for \$dart2js.environment: "foo" '
-            '(expected map from strings to strings).'));
-    endPubServe();
-  });
-}