fix(kotlin): move jni_emitter tests last in the flattened module

jni_emitter.rs include!s its sub-files into one module. bridge_object.rs
(included first) ended with the `#[cfg(test)] mod tests`, so every production
item in the seven files included after it counted as appearing after a test
module — tripping clippy::items_after_test_module under -D warnings. Extract
the test module into jni_emitter/tests.rs and include! it last so the test
module is the final item. No behavior change; the test still passes.

Author: tobocop2

src/backends/kotlin/gen_bindings/jni_emitter.rs

@@ -32,3 +32,6 @@ include!("jni_emitter/constructors.rs");
 include!("jni_emitter/binary_json.rs");
 include!("jni_emitter/trait_bridge.rs");
 include!("jni_emitter/paths.rs");
+// Included last so the `#[cfg(test)]` module is the final item in this flattened module
+// (`clippy::items_after_test_module`).
+include!("jni_emitter/tests.rs");

src/backends/kotlin/gen_bindings/jni_emitter/bridge_object.rs

@@ -237,29 +237,3 @@ fn trait_bridge_manages_jni_function(func_name: &str, config: &ResolvedCrateConf
                 || bridge.clear_fn.as_deref() == Some(func_name))
     })
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::core::config::{KotlinAndroidConfig, TraitBridgeConfig};
-
-    #[test]
-    fn jni_bridge_object_treats_android_trait_lifecycle_functions_as_managed() {
-        let config = ResolvedCrateConfig {
-            kotlin_android: Some(KotlinAndroidConfig::default()),
-            trait_bridges: vec![TraitBridgeConfig {
-                trait_name: "Renderer".to_string(),
-                register_fn: Some("register_renderer".to_string()),
-                unregister_fn: Some("unregister_renderer".to_string()),
-                clear_fn: Some("clear_renderers".to_string()),
-                ..TraitBridgeConfig::default()
-            }],
-            ..ResolvedCrateConfig::default()
-        };
-
-        assert!(trait_bridge_manages_jni_function("register_renderer", &config));
-        assert!(trait_bridge_manages_jni_function("unregister_renderer", &config));
-        assert!(trait_bridge_manages_jni_function("clear_renderers", &config));
-        assert!(!trait_bridge_manages_jni_function("list_renderers", &config));
-    }
-}

src/backends/kotlin/gen_bindings/jni_emitter/tests.rs

@@ -0,0 +1,29 @@
+// Tests for the JNI emitter. Kept in a separate file `include!`d last by `jni_emitter.rs` so the
+// `#[cfg(test)]` module is the final item in the flattened module (the other `include!`d files
+// contribute production items, which must not follow a test module — `clippy::items_after_test_module`).
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::core::config::{KotlinAndroidConfig, TraitBridgeConfig};
+
+    #[test]
+    fn jni_bridge_object_treats_android_trait_lifecycle_functions_as_managed() {
+        let config = ResolvedCrateConfig {
+            kotlin_android: Some(KotlinAndroidConfig::default()),
+            trait_bridges: vec![TraitBridgeConfig {
+                trait_name: "Renderer".to_string(),
+                register_fn: Some("register_renderer".to_string()),
+                unregister_fn: Some("unregister_renderer".to_string()),
+                clear_fn: Some("clear_renderers".to_string()),
+                ..TraitBridgeConfig::default()
+            }],
+            ..ResolvedCrateConfig::default()
+        };
+
+        assert!(trait_bridge_manages_jni_function("register_renderer", &config));
+        assert!(trait_bridge_manages_jni_function("unregister_renderer", &config));
+        assert!(trait_bridge_manages_jni_function("clear_renderers", &config));
+        assert!(!trait_bridge_manages_jni_function("list_renderers", &config));
+    }
+}