[ios Mojo] Integration test for Mojo WebUI.

ios/web/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 source_set("web") {
   deps = [
@@ skipping 454 matching lines @@
     "webui/crw_web_ui_page_builder_unittest.mm",
     "webui/mojo_facade_unittest.mm",
     "webui/url_fetcher_block_adapter_unittest.mm",
   ]
 }
 
 test("ios_web_inttests") {
   deps = [
     ":test_support",
     ":web",
+    "test:mojo_bindings",

[sdefresne, 2016/05/28 13:04:01]

Please only use relative name for target defined in the same BUILD.gn file (this
makes it much easier to rename/move targets), so this should be:

    "//ios/web/test:mojo_bindings",
    "//ios/web/test:packed_resources",
    "//ios/web/test:resources",

[Eugene But (OOO till 7-30), 2016/05/31 17:26:57]

Done.

+    "test:packed_resources",
+    "test:resources",
     "//base/test:test_support",
+    "//ios/public/provider/web",
     "//mojo/edk/system",
     "//net:test_support",
+    "//services/shell/public/cpp",
     "//testing/gtest",
     "//ui/base:test_support",
   ]
   sources = [
     "browser_state_web_view_partition_inttest.mm",
     "public/test/http_server_inttest.mm",
     "test/run_all_unittests.cc",
+    "webui/web_ui_mojo_inttest.mm",
   ]
 }
 
 js_compile_bundle("web_ui_bundle") {
   visibility = [ ":js_resources" ]
   closure_entry_point = "__crWeb.webUIBundle"
 
   sources = [
     "../third_party/requirejs/require.js",
     "webui/resources/web_ui_base.js",
@@ skipping 27 matching lines @@
   ]
 
   sources = [
     "web_state/js/resources/plugin_placeholder.js",
     "web_state/js/resources/post_request.js",
     "web_state/js/resources/window_id.js",
   ]
 }
 
 grit("resources") {
   source = "ios_web_resources.grd"

[sdefresne, 2016/05/28 13:04:02]

  testonly = true

[Eugene But (OOO till 7-30), 2016/05/31 17:26:56]

This is not test only thing. This is for production.

[sdefresne, 2016/05/31 18:52:25]

I made this comment because the only grd file that appears to use root_gen_dir
in the cl (ios/web/test/test_resources.grd ) is to include generated
mojo_test.mojom.js that I assume to be a test file. So either the root_gen_dir
is unissued and should be removed or there is a dependency on a test file in
that production target which is a bug. 

   use_qualified_include = true

[sdefresne, 2016/05/28 13:04:01]

There is an indirect dependency on generated file
""${root_gen_dir}/ios/web/test/mojo_test.mojom.js" so you need to add it to the
"inputs" variable and add a dependency on the target that generate that file:

  inputs = [
    "${root_gen_dir}/ios/web/test/mojo_test.mojom.js",
  ]
  deps = [
    "//ios/web/test:mojo_bindings",
  ]

[Eugene But (OOO till 7-30), 2016/05/31 17:26:57]

ditto. This target does not contain any test resources.

   outputs = [
     "grit/ios_web_resources.h",
     "ios_web_resources.pak",
   ]
   grit_flags = [
     "-E",
-    "root_out_dir=" + rebase_path(root_out_dir, root_build_dir),
+    "root_gen_dir=" + rebase_path(root_out_dir, root_build_dir),

[sdefresne, 2016/05/28 13:04:02]

You want to have the grit variable "root_gen_dir" expands to the value of the gn
variable "root_gen_dir", so you should use the following:

  grit_flags = [
    "-E",
    "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
  ]

If you look at the tool failure, you'll see the error is:
IOError: [Errno 2] No such file or directory:
u'../../out/Release-iphoneos/ios/web/test/mojo_test.mojom.js'

This was because the file tried to include
"${root_gen_dir}/ios/web/test/mojo_test.mojom.js" and "root_gen_dir" grit
variable was expanded from this argument "-E root_gen_dir=../Release-iphoneos"
while it should have been "-E gen".

[Eugene But (OOO till 7-30), 2016/05/31 17:26:57]

Done. Thank you for explanation!

   ]
 }