Add failing test case

tests/blacken_docs_test.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from textwrap import dedent
+
 import black
 
 import blacken_docs
@@ -215,6 +217,23 @@ def test_format_src_rst_literal_blocks():
     )
 
 
+def test_format_src_rst_literal_blocks_nested():
+    before = dedent(
+        '''
+        * hello
+
+          .. warning::
+
+            don't hello too much
+        ''',
+    )
+    after, errors = blacken_docs.format_str(
+        before, BLACK_MODE, rst_literal_blocks=True,
+    )
+    assert after == before
+    assert errors == []
+
+
 def test_format_src_rst_sphinx_doctest():
     before = (
         '.. testsetup:: group1\n'