Add def_property_readonly test case

Author: jagerman

tests/test_methods_and_attributes.cpp

@@ -169,6 +169,7 @@ class UnregisteredBase {
     void increase_value() { rw_value++; ro_value += 0.25; }
     void set_int(int v) { rw_value = v; }
     int get_int() const { return rw_value; }
+    double get_double() const { return ro_value; }
     int rw_value = 42;
     double ro_value = 1.25;
 };
@@ -350,6 +351,7 @@ test_initializer methods_and_attributes([](py::module &m) {
         .def_readwrite("rw_value", &RegisteredDerived::rw_value)
         .def_readonly("ro_value", &RegisteredDerived::ro_value)
         .def_property("rw_value_prop", &RegisteredDerived::get_int, &RegisteredDerived::set_int)
+        .def_property_readonly("ro_value_prop", &RegisteredDerived::get_double)
         // This one is in the registered class:
         .def("sum", &RegisteredDerived::sum)
         ;

tests/test_methods_and_attributes.py

@@ -387,3 +387,5 @@ def test_unregistered_base_implementations():
     assert a.rw_value_prop == 48
     a.rw_value_prop += 1
     assert a.rw_value_prop == 49
+    a.increase_value()
+    assert a.ro_value_prop == 1.75