Add base::ExecutableExistsInPath

base/files/file_util_unittest.cc

Index: base/files/file_util_unittest.cc
diff --git a/base/files/file_util_unittest.cc b/base/files/file_util_unittest.cc
index ac3a654fdd3d8b179ecc9710b8fd48a1b4ab7a36..09c91566264dc45bdfedbe24ddeffcd805e6889b 100644
--- a/base/files/file_util_unittest.cc
+++ b/base/files/file_util_unittest.cc
@@ -12,6 +12,7 @@
 #include <vector>
 
 #include "base/base_paths.h"
+#include "base/environment.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ -838,6 +839,45 @@ TEST_F(FileUtilTest, ChangeDirectoryPermissionsAndEnumerate) {
   EXPECT_FALSE(PathExists(subdir_path));
 }
 
+TEST_F(FileUtilTest, ExecutableExistsInPath) {
+  // Create two directories that we will put in our PATH
+  const char kPath[] = "PATH";
+  const FilePath::CharType kDir1[] = FPL("dir1");
+  const FilePath::CharType kDir2[] = FPL("dir2");
+
+  FilePath dir1 = temp_dir_.path().Append(kDir1);
+  FilePath dir2 = temp_dir_.path().Append(kDir2);
+  ASSERT_TRUE(CreateDirectory(dir1));
+  ASSERT_TRUE(CreateDirectory(dir2));
+
+  std::unique_ptr<Environment> env(base::Environment::Create());
+
+  ASSERT_TRUE(env->SetVar(kPath, dir1.value() + ":" + dir2.value()));
+
+  const FilePath::CharType kRegularFileName[] = FPL("regular_file");
+  const FilePath::CharType kExeFileName[] = FPL("exe");
+  const FilePath::CharType kDneFileName[] = FPL("does_not_exist");
+
+  const FilePath kExePath = dir1.Append(kExeFileName);
+  const FilePath kRegularFilePath = dir2.Append(kRegularFileName);
+
+  // Write file.
+  const std::string kData("hello");
+  ASSERT_EQ(static_cast<int>(kData.length()),
+            WriteFile(kExePath, kData.data(), kData.length()));
+  ASSERT_TRUE(PathExists(kExePath));
+  ASSERT_EQ(static_cast<int>(kData.length()),
+            WriteFile(kRegularFilePath, kData.data(), kData.length()));
+  ASSERT_TRUE(PathExists(kRegularFilePath));
+
+  ASSERT_TRUE(SetPosixFilePermissions(dir1.Append(kExeFileName),
+                                      FILE_PERMISSION_EXECUTE_BY_USER));
+
+  EXPECT_TRUE(ExecutableExistsInPath(env.get(), kExeFileName));
+  EXPECT_FALSE(ExecutableExistsInPath(env.get(), kRegularFileName));
+  EXPECT_FALSE(ExecutableExistsInPath(env.get(), kDneFileName));
+}
+
 #endif  // defined(OS_POSIX)
 
 #if defined(OS_WIN)