tests: Test capitaliation of py::sequence and py::buffer

tests/test_buffers.py

@@ -219,3 +219,7 @@ def test_ctypes_from_buffer():
         assert cinfo.shape == pyinfo.shape
         assert cinfo.strides == pyinfo.strides
         assert not cinfo.readonly
+
+
+def test_buffer_docstring():
+    assert m.get_buffer_info.__doc__.strip() == "get_buffer_info(arg0: Buffer) -> pybind11_tests.buffers.buffer_info"

tests/test_sequences_and_iterators.py

@@ -171,6 +171,10 @@ def test_sequence_length():
     assert m.sequence_length("hello") == 5
 
 
+def test_sequence_doc():
+    assert m.sequence_length.__doc__.strip() == "sequence_length(arg0: Sequence) -> int"
+
+
 def test_map_iterator():
     sm = m.StringMap({"hi": "bye", "black": "white"})
     assert sm["hi"] == "bye"