Add test

Author: bdero

ci/licenses_golden/licenses_flutter

@@ -1123,6 +1123,7 @@ FILE: ../../../flutter/impeller/compiler/source_options.h
 FILE: ../../../flutter/impeller/compiler/spirv_sksl.cc
 FILE: ../../../flutter/impeller/compiler/spirv_sksl.h
 FILE: ../../../flutter/impeller/compiler/switches.cc
+FILE: ../../../flutter/impeller/compiler/switches_unittests.cc
 FILE: ../../../flutter/impeller/compiler/switches.h
 FILE: ../../../flutter/impeller/compiler/types.cc
 FILE: ../../../flutter/impeller/compiler/types.h

impeller/compiler/BUILD.gn

@@ -120,6 +120,7 @@ impeller_component("compiler_unittests") {
     "compiler_test.cc",
     "compiler_test.h",
     "compiler_unittests.cc",
+    "switches_unittests.cc",
   ]
 
   deps = [

impeller/compiler/switches_unittests.cc

@@ -0,0 +1,36 @@
+// Copyright 2013 The Flutter 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 "flutter/fml/command_line.h"
+#include "flutter/fml/file.h"
+#include "flutter/testing/testing.h"
+#include "impeller/compiler/switches.h"
+#include "impeller/compiler/utilities.h"
+
+namespace impeller {
+namespace compiler {
+namespace testing {
+
+TEST(SwitchesTest, DoesntMangleUnicodeIncludes) {
+  const char* directory_name = "test_shader_include_�";
+  fml::CreateDirectory(flutter::testing::OpenFixturesDirectory(),
+                       {directory_name}, fml::FilePermission::kRead);
+
+  auto include_path =
+      std::string(flutter::testing::GetFixturesPath()) + "/" + directory_name;
+  auto include_option = "--include=" + include_path;
+
+  const auto cl = fml::CommandLineFromInitializerList(
+      {"impellerc", "--opengl-desktop", "--input=input.vert",
+       "--sl=output.vert", "--spirv=output.spirv", include_option.c_str()});
+  Switches switches(cl);
+  ASSERT_TRUE(switches.AreValid(std::cout));
+  ASSERT_EQ(switches.include_directories.size(), 1u);
+  ASSERT_NE(switches.include_directories[0].dir, nullptr);
+  ASSERT_EQ(switches.include_directories[0].name, include_path);
+}
+
+}  // namespace testing
+}  // namespace compiler
+}  // namespace impeller