Add initial testing setup for file tag model

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

test/CMakeLists.txt

@@ -70,6 +70,7 @@ nextcloud_add_test(ShareModel)
 nextcloud_add_test(ShareeModel)
 nextcloud_add_test(SortedShareModel)
 nextcloud_add_test(SecureFileDrop)
+nextcloud_add_test(FileTagModel)
 
 target_link_libraries(SecureFileDropTest PRIVATE Nextcloud::sync)
 configure_file(fake2eelocksucceeded.json "${PROJECT_BINARY_DIR}/bin/fake2eelocksucceeded.json" COPYONLY)