Clang: Handle native file in the file cache

Different types are introduced for normalized and native file path. So the
compiler is warning you if you try the wrong format.

Change-Id: I1da0686b142cbf9bb7578468c2b50f90a94cebf9
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

tests/unit/unittest/filepath-test.cpp

@@ -37,6 +37,31 @@ TEST(FilePath, CreateFromPathString)
     ASSERT_THAT(filePath.name(), "pathOne");
 }
 
+TEST(FilePath, CreateFromDirectoryAndFileName)
+{
+    ClangBackEnd::FilePath filePath{Utils::PathString{"/file"}, Utils::PathString{"pathOne"}};
+
+    ASSERT_THAT(filePath.directory(), "/file");
+    ASSERT_THAT(filePath.name(), "pathOne");
+    ASSERT_THAT(filePath.path(), "/file/pathOne");
+}
+
+TEST(FilePath, CreateFromCString)
+{
+    ClangBackEnd::FilePath filePath{"/file/pathOne"};
+
+    ASSERT_THAT(filePath.directory(), "/file");
+    ASSERT_THAT(filePath.name(), "pathOne");
+}
+
+TEST(FilePath, CreateFromFilePathView)
+{
+    ClangBackEnd::FilePath filePath{ClangBackEnd::FilePathView{"/file/pathOne"}};
+
+    ASSERT_THAT(filePath.directory(), "/file");
+    ASSERT_THAT(filePath.name(), "pathOne");
+}
+
 TEST(FilePath, CreateFromQString)
 {
     ClangBackEnd::FilePath filePath{QString{"/file/pathOne"}};
@@ -45,7 +70,7 @@ TEST(FilePath, CreateFromQString)
     ASSERT_THAT(filePath.name(), "pathOne");
 }
 
-TEST(FilePath, EmptyFilePath)
+TEST(FilePath, DefaultFilePath)
 {
     ClangBackEnd::FilePath filePath;
 
@@ -53,4 +78,12 @@ TEST(FilePath, EmptyFilePath)
     ASSERT_THAT(filePath.name(), "");
 }
 
+TEST(FilePath, EmptyFilePath)
+{
+    ClangBackEnd::FilePath filePath("");
+
+    ASSERT_THAT(filePath.directory(), "");
+    ASSERT_THAT(filePath.name(), "");
+}
+
 }