Run all tests in the dedicated temp dir

green/cmdline.py

@@ -1,12 +1,13 @@
 from __future__ import unicode_literals
 import os
 import sys
+import tempfile
 
 # Importing from green (other than config) is done after coverage initialization
 import green.config as config
 
 
-def main(argv=None, testing=False):
+def _main(argv, testing):
     args = config.parseArguments(argv)
     args = config.mergeConfig(args, testing)
 
@@ -77,5 +78,20 @@ def main(argv=None, testing=False):
     return int(not result.wasSuccessful())
 
 
+def main(argv=None, testing=False):
+    # create the temp dir only once (i.e., not while in the recursed call)
+    if os.environ.get('TMPDIR') is None:
+        with tempfile.TemporaryDirectory() as temp_dir_for_tests:
+            try:
+                os.environ['TMPDIR'] = temp_dir_for_tests
+                tempfile.tempdir = temp_dir_for_tests
+                return _main(argv, testing)
+            finally:
+                del os.environ['TMPDIR']
+                tempfile.tempdir = None
+    else:
+        return _main(argv, testing)
+
+
 if __name__ == "__main__":  # pragma: no cover
     sys.exit(main())

green/process.py

@@ -291,12 +291,6 @@ def raise_internal_failure(msg):
 
     def cleanup():
         # Restore the state of the temp directory
-        # TODO: Make this not necessary on macOS+Python3 (see #173)
-        if sys.version_info[0] == 2:
-            try:
-                shutil.rmtree(tempfile.tempdir, ignore_errors=True)
-            except:
-                pass
         tempfile.tempdir = saved_tempdir
         queue.put(None)
         # Finish coverage