Call gc.collect() cause these tests leak file descriptors

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/test_functional.py b/tests/test_functional.py
index 3103391..4d1bcc3 100644
--- a/tests/test_functional.py
+++ b/tests/test_functional.py
@@ -102,6 +102,15 @@ class SubprocessTests:
         self.proc.join()
         self.proc.close()
 
+        # The following is for the benefit of PyPy 3, for some reason it is
+        # holding on to some resources way longer than necessary causing tests
+        # to fail with file desctriptor exceeded errors on macOS which defaults
+        # to 256 file desctriptors per process. While we could use ulimit to
+        # increase the limits before running tests, this works as well and
+        # means we don't need to remember to do that.
+        import gc
+        gc.collect()
+
     def assertline(self, line, status, reason, version):
         v, s, r = (x.strip() for x in line.split(None, 2))
         self.assertEqual(s, status.encode("latin-1"))