tests/extmod: Add test for ure regexes leading to infinite recursion.

These now should be caught properly and lead to RuntimeError instead of
crash.

2 files changed, 14 insertions, 0 deletions

diff --git a/tests/extmod/ure_stack_overflow.py b/tests/extmod/ure_stack_overflow.py
new file mode 100644
index 000000000..d3ce0c5a7
--- /dev/null
+++ b/tests/extmod/ure_stack_overflow.py
@@ -0,0 +1,13 @@
+try:
+    import ure as re
+except ImportError:
+    try:
+        import re
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+try:
+    re.match("(a*)*", "aaa")
+except RuntimeError:
+    print("RuntimeError")
diff --git a/tests/extmod/ure_stack_overflow.py.exp b/tests/extmod/ure_stack_overflow.py.exp
new file mode 100644
index 000000000..8a2b9bfdd
--- /dev/null
+++ b/tests/extmod/ure_stack_overflow.py.exp
@@ -0,0 +1 @@
+RuntimeError