Exclude 'test' and 'testcases' from lib/ packages.

sdk/BUILD.gn

 # Copyright (c) 2017, 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.
 
 # This GN file contains build rules for assembling the Dart SDK. There are
 # two possible variants: the "Full" SDK, and the "Platform" SDK. If you want
 # to make a new subset of the Full SDK, make it the same way we make
 # the Platform SDK.
 #
 # Warning:
@@ skipping 367 matching lines @@
     deps += [ ":copy_${snapshot[0]}_snapshot" ]
   }
 }
 
 # This loop generates rules for copying analyzer sources into lib/
 foreach(analyzer_source_dir, _analyzer_source_dirs) {
   copy_tree("copy_${analyzer_source_dir}_source_dir") {
     visibility = [ ":copy_analyzer_sources" ]
     source = "../pkg/$analyzer_source_dir"
     dest = "$root_out_dir/dart-sdk/lib/$analyzer_source_dir"
-    exclude = "*.svn,doc,*.py,*.gypi,*.sh,.gitignore,packages"
+    exclude = "*.svn,doc,*.py,*.gypi,*.sh,.gitignore,packages,test,testcases"
   }
 }
 
 # This is the main rule for copying analyzer sources to lib/
 group("copy_analyzer_sources") {
   visibility = [ ":create_common_sdk" ]
   deps = []
   foreach(analyzer_source_dir, _analyzer_source_dirs) {
     deps += [ ":copy_${analyzer_source_dir}_source_dir" ]
   }
@@ skipping 350 matching lines @@
 group("create_sdk") {
   deps = [
     ":create_common_sdk",
   ]
   if (dart_platform_sdk) {
     deps += [ ":create_platform_sdk" ]
   } else {
     deps += [ ":create_full_sdk" ]
   }
 }