add test case for InitConfig::add_module

Author: Person-93

Cargo.toml

@@ -352,6 +352,10 @@ required-features = ["macros"]
 name = "test_inheritance"
 required-features = ["macros"]
 
+[[test]]
+name = "test_init_config_add_module"
+required-features = ["macros"]
+
 [[test]]
 name = "test_intopyobject"
 required-features = ["macros"]

tests/test_init_config_add_module.rs

@@ -0,0 +1,30 @@
+#![cfg(all(Py_3_14, not(any(PyPy, GraalPy, RustPython, Py_LIMITED_API))))]
+#![cfg(feature = "macros")]
+#![allow(clippy::undocumented_unsafe_blocks, reason = "tests")]
+
+use pyo3::add_module_to_init_config;
+use pyo3::init_config::InitConfig;
+use pyo3::prelude::*;
+
+#[test]
+fn test_add_module() {
+    let mut config = InitConfig::default();
+    add_module_to_init_config!(config, m).unwrap();
+    config.initialize().unwrap();
+    Python::attach(|py| {
+        let m = py.import("m").unwrap();
+        let get_42 = m.getattr("get_42").unwrap();
+        let forty_two = get_42.call0().unwrap().extract::<i32>().unwrap();
+        assert_eq!(42, forty_two);
+    });
+}
+
+#[pymodule]
+mod m {
+    use pyo3::prelude::*;
+
+    #[pyfunction]
+    fn get_42() -> i32 {
+        42
+    }
+}