scripts/test.py: on Pyodide, exit with error if pytest fails.

In test() we now check that pytest.main() returns zero.

Author: julian-smith-artifex-com

scripts/test.py

@@ -1297,7 +1297,8 @@ def getmtime(path):
         for arg in args:
             log(f'    {arg!r}')
         import pytest
-        pytest.main(args)
+        e = pytest.main(args)
+        assert e == 0, f'pytest.main() failed: {e=}'
         return
 
     if venv >= 2: