UnitTests: Move some unit tests to where they should be

Two unit tests were in the root UnitTests folder
and were not being built when using CMake.

Source/UnitTests/Common/FileUtilTest.cpp

@@ -0,0 +1,103 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <array>
+#include <gtest/gtest.h>
+
+#include "Common/FileUtil.h"
+
+class FileUtilTest : public testing::Test
+{
+protected:
+  FileUtilTest()
+      : m_parent_directory(File::CreateTempDir()), m_file_path(m_parent_directory + "/file.txt"),
+        m_directory_path(m_parent_directory + "/dir"),
+        m_invalid_path(m_parent_directory + "/invalid.txt")
+  {
+  }
+
+  ~FileUtilTest() override
+  {
+    if (!m_parent_directory.empty())
+    {
+      File::DeleteDirRecursively(m_parent_directory);
+    }
+  }
+
+  void SetUp()
+  {
+    if (m_parent_directory.empty())
+    {
+      FAIL();
+    }
+  }
+
+  constexpr static std::array<File::IfAbsentBehavior, 2> s_warning_behaviors = {
+      File::IfAbsentBehavior::ConsoleWarning,
+      File::IfAbsentBehavior::NoConsoleWarning,
+  };
+
+  const std::string m_parent_directory;
+  const std::string m_file_path;
+  const std::string m_directory_path;
+  const std::string m_invalid_path;
+};
+
+static void DeleteShouldNotRemoveDirectory(const std::string& path, File::IfAbsentBehavior behavior)
+{
+  File::CreateDir(path);
+  EXPECT_FALSE(File::Delete(path, behavior));
+  File::DeleteDir(path, behavior);
+}
+
+static void DeleteShouldRemoveFile(const std::string& path, File::IfAbsentBehavior behavior)
+{
+  File::CreateEmptyFile(path);
+  EXPECT_TRUE(File::Delete(path, behavior));
+}
+
+static void DeleteShouldReturnTrueForInvalidPath(const std::string& path,
+                                                 File::IfAbsentBehavior behavior)
+{
+  EXPECT_TRUE(File::Delete(path, behavior));
+}
+
+static void DeleteDirShouldRemoveDirectory(const std::string& path, File::IfAbsentBehavior behavior)
+{
+  File::CreateDir(path);
+  EXPECT_TRUE(File::DeleteDir(path, behavior));
+}
+
+static void DeleteDirShouldNotRemoveFile(const std::string& path, File::IfAbsentBehavior behavior)
+{
+  File::CreateEmptyFile(path);
+  EXPECT_FALSE(File::DeleteDir(path, behavior));
+  File::Delete(path, behavior);
+}
+
+static void DeleteDirShouldReturnTrueForInvalidPath(const std::string& path,
+                                                    File::IfAbsentBehavior behavior)
+{
+  EXPECT_TRUE(File::DeleteDir(path, behavior));
+}
+
+TEST_F(FileUtilTest, Delete)
+{
+  for (const auto behavior : s_warning_behaviors)
+  {
+    DeleteShouldNotRemoveDirectory(m_directory_path, behavior);
+    DeleteShouldRemoveFile(m_file_path, behavior);
+    DeleteShouldReturnTrueForInvalidPath(m_invalid_path, behavior);
+  }
+}
+
+TEST_F(FileUtilTest, DeleteDir)
+{
+  for (const auto behavior : s_warning_behaviors)
+  {
+    DeleteDirShouldRemoveDirectory(m_directory_path, behavior);
+    DeleteDirShouldNotRemoveFile(m_file_path, behavior);
+    DeleteDirShouldReturnTrueForInvalidPath(m_invalid_path, behavior);
+  }
+}