1 files changed, 21 insertions, 0 deletions
diff --git a/test/test_jsinterp.py b/test/test_jsinterp.py
index 328941e09..faddf00d5 100644
--- a/test/test_jsinterp.py
+++ b/test/test_jsinterp.py
@@ -9,6 +9,7 @@ import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 import math
+import re
 
 from youtube_dl.jsinterp import JSInterpreter
 undefined = JSInterpreter.undefined
@@ -316,19 +317,39 @@ class TestJSInterpreter(unittest.TestCase):
         function x() { return {}; }
         ''')
         self.assertEqual(jsi.call_function('x'), {})
+
         jsi = JSInterpreter('''
         function x() { let a = {m1: 42, m2: 0 }; return [a["m1"], a.m2]; }
         ''')
         self.assertEqual(jsi.call_function('x'), [42, 0])
+
         jsi = JSInterpreter('''
         function x() { let a; return a?.qq; }
         ''')
         self.assertIs(jsi.call_function('x'), undefined)
+
         jsi = JSInterpreter('''
         function x() { let a = {m1: 42, m2: 0 }; return a?.qq; }
         ''')
         self.assertIs(jsi.call_function('x'), undefined)
 
+    def test_regex(self):
+        jsi = JSInterpreter('''
+        function x() { let a=/,,[/,913,/](,)}/; }
+        ''')
+        self.assertIs(jsi.call_function('x'), None)
+
+        jsi = JSInterpreter('''
+        function x() { let a=/,,[/,913,/](,)}/; return a; }
+        ''')
+        # Pythons disagree on the type of a pattern
+        self.assertTrue(isinstance(jsi.call_function('x'), type(re.compile(''))))
+
+        jsi = JSInterpreter('''
+        function x() { let a=/,,[/,913,/](,)}/i; return a; }
+        ''')
+        self.assertEqual(jsi.call_function('x').flags & re.I, re.I)
+
 
 if __name__ == '__main__':
     unittest.main()