test(jni): implement JNI_OnLoad and ANativeActivity end-to-end integration test

crates/molotov-core/tests/jni_lifecycle_test.rs

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use molotov_core::jni::activity::{ANativeActivity, ActivityRunner};
+use molotov_core::jni::types::{JavaVMPtr, JNI_VERSION_1_6};
+
+// Simulated JNI_OnLoad exported by libroblox.so
+unsafe extern "C" fn mock_jni_onload(vm: JavaVMPtr, _reserved: *mut ()) -> i32 {
+    let mut env = std::ptr::null_mut();
+    let res = (**vm).GetEnv.unwrap()(vm, &mut env, JNI_VERSION_1_6);
+    if res == 0 && !env.is_null() {
+        JNI_VERSION_1_6
+    } else {
+        -1
+    }
+}
+
+// Simulated ANativeActivity_onCreate exported by libroblox.so
+unsafe extern "C" fn mock_native_activity_on_create(
+    activity: *mut ANativeActivity,
+    _saved_state: *mut (),
+    _saved_state_size: usize,
+) {
+    if let Some(act) = activity.as_mut() {
+        if let Some(cbs) = act.callbacks.as_mut() {
+            cbs.onResume = Some(mock_on_resume);
+        }
+    }
+}
+
+static mut RESUME_CALLED: bool = false;
+unsafe extern "C" fn mock_on_resume(_activity: *mut ANativeActivity) {
+    RESUME_CALLED = true;
+}
+
+#[test]
+fn test_jni_onload_and_native_activity_lifecycle() {
+    let mut runner = ActivityRunner::new();
+
+    // 1. Simulate JNI_OnLoad execution
+    unsafe {
+        let ver = mock_jni_onload(runner.activity.vm, std::ptr::null_mut());
+        assert_eq!(ver, JNI_VERSION_1_6, "JNI_OnLoad must return JNI_VERSION_1_6");
+
+        // 2. Simulate ANativeActivity_onCreate
+        mock_native_activity_on_create(&mut *runner.activity, std::ptr::null_mut(), 0);
+
+        // 3. Trigger Resume callback registered by the engine
+        runner.trigger_resume();
+        assert!(RESUME_CALLED, "Registered onResume callback must be invoked");
+    }
+}