Disable image rename on upload

The renaming to test1.jpg is not due to any cropping / resizing functions WordPress. This is because you already had a file named test.jpg uploaded, and WordPress does not replace files if one exists in the folder that has the same name. If, for some reason you want it to replace files rather than rename it (not recommended) you can use a plugin like: https://wordpress.org/plugins/overwrite-uploads/ and it will not rename your files, it will replace existing files.