Add the concept of a source set to GN.

tools/gn/ninja_binary_target_writer_unittest.cc

Index: tools/gn/ninja_binary_target_writer_unittest.cc
diff --git a/tools/gn/ninja_binary_target_writer_unittest.cc b/tools/gn/ninja_binary_target_writer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f57bb19d2dc5291c05a4abb0618758d90d3a7f3c
--- /dev/null
+++ b/tools/gn/ninja_binary_target_writer_unittest.cc
@@ -0,0 +1,89 @@
+// 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 <sstream>
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "tools/gn/ninja_binary_target_writer.h"
+#include "tools/gn/test_with_scope.h"
+
+TEST(NinjaBinaryTargetWriter, SourceSet) {
+  TestWithScope setup;
+  setup.build_settings()->SetBuildDir(SourceDir("//out/Debug/"));
+  setup.settings()->set_target_os(Settings::WIN);
+
+  Target target(setup.settings(), Label(SourceDir("//foo/"), "bar"));
+  target.set_output_type(Target::SOURCE_SET);
+  target.sources().push_back(SourceFile("//foo/input1.cc"));
+  target.sources().push_back(SourceFile("//foo/input2.cc"));
+  target.OnResolved();
+
+  // Source set itself.
+  {
+    std::ostringstream out;
+    NinjaBinaryTargetWriter writer(&target, out);
+    writer.Run();
+
+    // TODO(brettw) I think we'll need to worry about backslashes here
+    // depending if we're on actual Windows or Linux pretending to be Windows.
+    const char expected_win[] =
+        "arch = environment.x86\n"
+        "defines =\n"
+        "includes =\n"
+        "cflags =\n"
+        "cflags_c =\n"
+        "cflags_cc =\n"
+        "cflags_objc =\n"
+        "cflags_objcc =\n"
+        "\n"
+        "build obj/foo/bar.input1.obj: tc_cxx ../../foo/input1.cc\n"
+        "build obj/foo/bar.input2.obj: tc_cxx ../../foo/input2.cc\n"
+        "\n"
+        "build obj/foo/bar.stamp: tc_stamp obj/foo/bar.input1.obj obj/foo/bar.input2.obj\n";
+    std::string out_str = out.str();
+#if defined(OS_WIN)
+    std::replace(out_str.begin(), out_str.end(), '\\', '/');
+#endif
+    EXPECT_EQ(expected_win, out_str);
+  }
+
+  // A shared library that depends on the source set.
+  Target shlib_target(setup.settings(), Label(SourceDir("//foo/"), "shlib"));
+  shlib_target.set_output_type(Target::SHARED_LIBRARY);
+  shlib_target.deps().push_back(&target);
+  shlib_target.OnResolved();
+
+  {
+    std::ostringstream out;
+    NinjaBinaryTargetWriter writer(&shlib_target, out);
+    writer.Run();
+
+    // TODO(brettw) I think we'll need to worry about backslashes here
+    // depending if we're on actual Windows or Linux pretending to be Windows.
+    const char expected_win[] =
+        "arch = environment.x86\n"
+        "defines =\n"
+        "includes =\n"
+        "cflags =\n"
+        "cflags_c =\n"
+        "cflags_cc =\n"
+        "cflags_objc =\n"
+        "cflags_objcc =\n"
+        "\n"
+        "\n"
+        "manifests = obj/foo/shlib.intermediate.manifest\n"
+        "ldflags = /MANIFEST /ManifestFile:obj/foo/shlib.intermediate.manifest\n"
+        "libs =\n"
+        "build shlib.dll shlib.dll.lib: tc_solink obj/foo/bar.input1.obj obj/foo/bar.input2.obj\n"
+        "  soname = shlib.dll\n"
+        "  lib = shlib.dll\n"
+        "  dll = shlib.dll\n"
+        "  implibflag = /IMPLIB:shlib.dll.lib\n\n";
+    std::string out_str = out.str();
+#if defined(OS_WIN)
+    std::replace(out_str.begin(), out_str.end(), '\\', '/');
+#endif
+    EXPECT_EQ(expected_win, out_str);
+  }
+}