Fix test runner for acceptance tests

Author: Tattoo

tests/atest/run_tests.py

@@ -4,6 +4,12 @@
 import sys
 import os
 
+from pathlib import Path
+
 from robot import run_cli
 
-run_cli(sys.argv[1:] + [os.path.dirname(__file__)])
+
+if __name__ == '__main__':
+    curdir = Path(__file__).parent
+    srcdir = curdir / '..' / '..' / 'src'
+    run_cli(sys.argv[1:] + ['-P', srcdir.resolve(), curdir])