Forward dependent configs from groups properly in GN.

tools/gn/target_unittest.cc

 // Copyright (c) 2013 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/build_settings.h"
 #include "tools/gn/config.h"
 #include "tools/gn/settings.h"
 #include "tools/gn/target.h"
 #include "tools/gn/toolchain.h"
@@ skipping 151 matching lines @@
   b_fwd.OnResolved();
   a_fwd.OnResolved();
 
   // A_fwd should now have both configs.
   ASSERT_EQ(2u, a_fwd.configs().size());
   EXPECT_EQ(&all, a_fwd.configs()[0].ptr);
   EXPECT_EQ(&direct, a_fwd.configs()[1].ptr);
   ASSERT_EQ(1u, a_fwd.all_dependent_configs().size());
   EXPECT_EQ(&all, a_fwd.all_dependent_configs()[0].ptr);
 }
+
+// Tests that forward_dependent_configs_from works for groups, forwarding the
+// group's deps' dependent configs.
+TEST_F(TargetTest, ForwardDependentConfigsFromGroups) {
+  Target a(&settings_, Label(SourceDir("//foo/"), "a"));
+  a.set_output_type(Target::EXECUTABLE);
+  Target b(&settings_, Label(SourceDir("//foo/"), "b"));
+  b.set_output_type(Target::GROUP);
+  Target c(&settings_, Label(SourceDir("//foo/"), "c"));
+  c.set_output_type(Target::STATIC_LIBRARY);
+  a.deps().push_back(LabelTargetPair(&b));
+  b.deps().push_back(LabelTargetPair(&c));
+
+  // Direct dependent config on C.
+  Config direct(&settings_, Label(SourceDir("//foo/"), "direct"));
+  c.direct_dependent_configs().push_back(LabelConfigPair(&direct));
+
+  // A forwards the dependent configs from B.
+  a.forward_dependent_configs().push_back(LabelTargetPair(&b));
+
+  c.OnResolved();
+  b.OnResolved();
+  a.OnResolved();
+
+  // The config should now be on A, and in A's direct dependent configs.
+  ASSERT_EQ(1u, a.configs().size());
+  ASSERT_EQ(&direct, a.configs()[0].ptr);
+  ASSERT_EQ(1u, a.direct_dependent_configs().size());
+  ASSERT_EQ(&direct, a.direct_dependent_configs()[0].ptr);
+}