Fix group datadeps

tools/gn/ninja_group_target_writer_unittest.cc

Index: tools/gn/ninja_group_target_writer_unittest.cc
diff --git a/tools/gn/ninja_group_target_writer_unittest.cc b/tools/gn/ninja_group_target_writer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0aec35c5890354b003c6b2af6e92da1fbc9ed439
--- /dev/null
+++ b/tools/gn/ninja_group_target_writer_unittest.cc
@@ -0,0 +1,48 @@
+// Copyright 2014 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.
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "tools/gn/ninja_group_target_writer.h"
+#include "tools/gn/target.h"
+#include "tools/gn/test_with_scope.h"
+
+TEST(NinjaGroupTargetWriter, Run) {
+  TestWithScope setup;
+  Err err;
+
+  setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
+  Target target(setup.settings(), Label(SourceDir("//foo/"), "bar"));
+
+  target.set_output_type(Target::GROUP);
+
+  Target dep(setup.settings(), Label(SourceDir("//foo/"), "dep"));
+  dep.set_output_type(Target::ACTION);
+  dep.SetToolchain(setup.toolchain());
+  ASSERT_TRUE(dep.OnResolved(&err));
+
+  Target dep2(setup.settings(), Label(SourceDir("//foo/"), "dep2"));
+  dep2.set_output_type(Target::ACTION);
+  dep2.SetToolchain(setup.toolchain());
+  ASSERT_TRUE(dep2.OnResolved(&err));
+
+  Target datadep(setup.settings(), Label(SourceDir("//foo/"), "datadep"));
+  datadep.set_output_type(Target::ACTION);
+  datadep.SetToolchain(setup.toolchain());
+  ASSERT_TRUE(datadep.OnResolved(&err));
+
+  target.deps().push_back(LabelTargetPair(&dep));
+  target.deps().push_back(LabelTargetPair(&dep2));
+  target.datadeps().push_back(LabelTargetPair(&datadep));
+
+  target.SetToolchain(setup.toolchain());
+  ASSERT_TRUE(target.OnResolved(&err));
+
+  std::ostringstream out;
+  NinjaGroupTargetWriter writer(&target, out);
+  writer.Run();
+
+  const char expected[] =
+      "build obj/foo/bar.stamp: stamp obj/foo/dep.stamp obj/foo/dep2.stamp || obj/foo/datadep.stamp\n";
+  EXPECT_EQ(expected, out.str());
+}