Control whether pub build and serve minify or not.

sdk/lib/_internal/pub/test/build/takes_flag_to_disable_minification_test.dart

Index: sdk/lib/_internal/pub/test/build/takes_flag_to_disable_minification_test.dart
diff --git a/sdk/lib/_internal/pub/test/build/takes_flag_to_disable_minification_test.dart b/sdk/lib/_internal/pub/test/build/takes_flag_to_disable_minification_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..fc4bfd0e15c84d8fcc072a21bc45189736bb4fb7
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/build/takes_flag_to_disable_minification_test.dart
@@ -0,0 +1,35 @@
+// 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.
+
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+main() {
+  initConfig();
+
+  integration("takes a flag to generate unminified JavaScript", () {
+    // Dart2js can take a long time to compile dart code, so we increase the
+    // timeout to cope with that.
+    currentSchedule.timeout *= 3;
+
+    d.dir(appPath, [
+      d.appPubspec(),
+      d.dir('web', [
+        d.file('main.dart', 'void main() => print("hello");')
+      ])
+    ]).create();
+
+    schedulePub(args: ["build", "--no-minify"],
+        output: new RegExp(r"Built 1 file!"),
+        exitCode: 0);
+
+    d.dir(appPath, [
+      d.dir('build', [
+        d.matcherFile('main.dart.js', isUnminifiedDart2JSOutput)
+      ])
+    ]).validate();
+  });
+}