Merge pull request matplotlib#16126 from Kojoley/tst-test_fork-missing-join

TST: test_fork: Missing join

Author: anntzer

lib/matplotlib/tests/test_font_manager.py

@@ -197,4 +197,5 @@ def _model_handler(_):
 def test_fork():
     _model_handler(0)  # Make sure the font cache is filled.
     ctx = multiprocessing.get_context("fork")
-    ctx.Pool(processes=2).map(_model_handler, range(2))
+    with ctx.Pool(processes=2) as pool:
+        pool.map(_model_handler, range(2))