Control whether pub build and serve minify or not.

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

Index: sdk/lib/_internal/pub/test/build/minifies_js_by_default_test.dart
diff --git a/sdk/lib/_internal/pub/test/build/includes_assets_from_dependencies_test.dart b/sdk/lib/_internal/pub/test/build/minifies_js_by_default_test.dart
similarity index 50%
copy from sdk/lib/_internal/pub/test/build/includes_assets_from_dependencies_test.dart
copy to sdk/lib/_internal/pub/test/build/minifies_js_by_default_test.dart
index 1455808d965975d28c96c4d59c22360b4af67a77..73f58dd82c1d663f6020f6a99c343d7cef232ec2 100644
--- a/sdk/lib/_internal/pub/test/build/includes_assets_from_dependencies_test.dart
+++ b/sdk/lib/_internal/pub/test/build/minifies_js_by_default_test.dart
@@ -10,45 +10,25 @@ import '../test_pub.dart';
 main() {
   initConfig();
 
-  integration("includes assets from dependencies", () {
+  integration("generates minified 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("foo", [
-      d.libPubspec("foo", "0.0.1"),
-      d.dir("asset", [
-        d.file("foo.txt", "foo"),
-        d.dir("sub", [
-          d.file("bar.txt", "bar"),
-        ])
-      ])
-    ]).create();
-
     d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": "../foo"}
-      }),
-      d.dir("web", [
-        d.file("index.html", "html"),
+      d.appPubspec(),
+      d.dir('web', [
+        d.file('main.dart', 'void main() => print("hello");')
       ])
     ]).create();
 
     schedulePub(args: ["build"],
-        output: new RegExp(r"Built 3 files!"),
+        output: new RegExp(r"Built 1 file!"),
         exitCode: 0);
 
     d.dir(appPath, [
       d.dir('build', [
-        d.file("index.html", "html"),
-        d.dir('assets', [
-          d.dir('foo', [
-            d.file('foo.txt', 'foo'),
-            d.dir('sub', [
-              d.file('bar.txt', 'bar'),
-            ]),
-          ])
-        ])
+        d.matcherFile('main.dart.js', isMinifiedDart2JSOutput)
       ])
     ]).validate();
   });