1 files changed, 21 insertions, 0 deletions
diff --git a/test/unit/test_asyncify.py b/test/unit/test_asyncify.py
index 479d24cab..40ee160d2 100644
--- a/test/unit/test_asyncify.py
+++ b/test/unit/test_asyncify.py
@@ -1,4 +1,5 @@
 import os
+import subprocess
 
 from scripts.test.shared import WASM_OPT, WASM_DIS, WASM_SHELL, NODEJS, run_process
 from utils import BinaryenTestCase
@@ -27,3 +28,23 @@ class AsyncifyTest(BinaryenTestCase):
     output = run_process(WASM_SHELL + ['a.wast'], capture_output=True).stdout
     with open(self.input_path('asyncify-pure.txt')) as f:
       self.assertEqual(f.read(), output)
+
+  def test_asyncify_list_bad(self):
+    for arg, warning in [
+      ('--pass-arg=asyncify-blacklist@nonexistent', 'nonexistent'),
+      ('--pass-arg=asyncify-whitelist@nonexistent', 'nonexistent'),
+      ('--pass-arg=asyncify-blacklist@main', None),
+      ('--pass-arg=asyncify-whitelist@main', None),
+    ]:
+      print(arg, warning)
+      err = run_process(WASM_OPT + [self.input_path('asyncify-pure.wast'), '--asyncify', arg], stdout=subprocess.PIPE, stderr=subprocess.PIPE).stderr.strip()
+      if warning:
+        self.assertIn('warning', err)
+        self.assertIn(warning, err)
+      else:
+        self.assertNotIn('warning', err)
+
+  def test_asyncify_blacklist_and_whitelist(self):
+    proc = run_process(WASM_OPT + [self.input_path('asyncify-pure.wast'), '--asyncify', '--pass-arg=asyncify-whitelist@main', '--pass-arg=asyncify-blacklist@main'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, check=False)
+    self.assertNotEqual(proc.returncode, 0, 'must error on using both lists at once')
+    self.assertIn('It makes no sense to use both a blacklist and a whitelist with asyncify', proc.stdout)