Improve handling of file limit tests for JIT implementations

* Add checks for `IS_GRAALPY` and `IS_PYPY` to conditionally adjust file descriptor limits.
* Refactor the test to use `pytest.raises` for more robust assertion of `OSError` during file descriptor exhaustion.
* Ensure that the `EMFILE` error code and specific error message are checked for JIT environments.

Signed-off-by: Emre Şafak <[email protected]>

Author: esafak

tests/unit/test_file_limit.py

@@ -6,6 +6,7 @@
 
 import pytest
 
+from src.virtualenv.info import IS_GRAALPY, IS_PYPY
 from virtualenv.info import IMPLEMENTATION
 from virtualenv.run import cli_run
 
@@ -32,11 +33,10 @@ def test_too_many_open_files(tmp_path):
     fds = []
     try:
         # JIT implementations use more file descriptors up front so we can run out early
-        try:
-            fds.extend(os.open(os.devnull, os.O_RDONLY) for _ in range(20))
-        except OSError as jit_exceptions:  # pypy, graalpy
-            assert jit_exceptions.errno == errno.EMFILE
-            assert "Too many open files" in str(jit_exceptions)
+        if IS_GRAALPY or IS_PYPY:
+            with pytest.raises(OSError, match="Too many open files") as jit_exception:
+                fds.extend(os.open(os.devnull, os.O_RDONLY) for _ in range(20))
+            assert jit_exception.value.errno == errno.EMFILE
 
         expected_exceptions = SystemExit, OSError, RuntimeError
         with pytest.raises(expected_exceptions) as too_many_open_files_exc: