1 files changed, 49 insertions, 0 deletions
diff --git a/ext/pybind11/tests/test_opaque_types.py b/ext/pybind11/tests/test_opaque_types.py
new file mode 100644
index 000000000..7781943b4
--- /dev/null
+++ b/ext/pybind11/tests/test_opaque_types.py
@@ -0,0 +1,49 @@
+import pytest
+
+
+def test_string_list():
+    from pybind11_tests import StringList, ClassWithSTLVecProperty, print_opaque_list
+
+    l = StringList()
+    l.push_back("Element 1")
+    l.push_back("Element 2")
+    assert print_opaque_list(l) == "Opaque list: [Element 1, Element 2]"
+    assert l.back() == "Element 2"
+
+    for i, k in enumerate(l, start=1):
+        assert k == "Element {}".format(i)
+    l.pop_back()
+    assert print_opaque_list(l) == "Opaque list: [Element 1]"
+
+    cvp = ClassWithSTLVecProperty()
+    assert print_opaque_list(cvp.stringList) == "Opaque list: []"
+
+    cvp.stringList = l
+    cvp.stringList.push_back("Element 3")
+    assert print_opaque_list(cvp.stringList) == "Opaque list: [Element 1, Element 3]"
+
+
+def test_pointers(msg):
+    from pybind11_tests import (return_void_ptr, get_void_ptr_value, ExampleMandA,
+                                print_opaque_list, return_null_str, get_null_str_value,
+                                return_unique_ptr, ConstructorStats)
+
+    assert get_void_ptr_value(return_void_ptr()) == 0x1234
+    assert get_void_ptr_value(ExampleMandA())  # Should also work for other C++ types
+    assert ConstructorStats.get(ExampleMandA).alive() == 0
+
+    with pytest.raises(TypeError) as excinfo:
+        get_void_ptr_value([1, 2, 3])  # This should not work
+    assert msg(excinfo.value) == """
+        get_void_ptr_value(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: capsule) -> int
+
+        Invoked with: [1, 2, 3]
+    """  # noqa: E501 line too long
+
+    assert return_null_str() is None
+    assert get_null_str_value(return_null_str()) is not None
+
+    ptr = return_unique_ptr()
+    assert "StringList" in repr(ptr)
+    assert print_opaque_list(ptr) == "Opaque list: [some value]"