add integration test

.github/workflows/test-package.yml

@@ -82,7 +82,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest]
     steps:
       - uses: actions/checkout@v3
       - uses: subosito/flutter-action@v2
@@ -129,6 +129,7 @@ jobs:
       - run: flutter config --enable-linux-desktop
       - run: flutter pub get
       - run: flutter test
+      - run: flutter test integration_test/integration_test.dart -d linux
       - run: flutter build linux
 
   build_jni_example_windows:
@@ -147,6 +148,7 @@ jobs:
           java-version: '11'
       - run: flutter config --enable-windows-desktop
       - run: flutter pub get
+      - run: flutter test integration_test/integration_test.dart -d windows
       - run: flutter build windows
 
   build_jni_example_macos:

jni/example/integration_test/integration_test.dart

@@ -0,0 +1,39 @@
+import 'dart:io';
+// import 'package:path/path.dart' as path;
+import 'package:ffi/ffi.dart';
+
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:jni/jni.dart';
+
+void main() {
+  if (!Platform.isAndroid) {
+    Jni.spawn();
+  }
+
+  var jni = Jni.getInstance();
+
+  testWidgets('Manually lookup & call Long.toHexString static method',
+      (tester) async {
+    final arena = Arena();
+    final env = jni.getEnv();
+
+    final longClass = env.FindClass("java/lang/Long".toNativeChars(arena));
+    final hexMethod = env.GetStaticMethodID(
+        longClass,
+        "toHexString".toNativeChars(arena),
+        "(J)Ljava/lang/String;".toNativeChars(arena));
+
+    for (var i in [1, 80, 13, 76, 1134453224145]) {
+      final jres = env.CallStaticObjectMethodA(
+          longClass, hexMethod, Jni.jvalues([JValueLong(i)], allocator: arena));
+
+      final res = env.asDartString(jres);
+      expect(res, equals(i.toRadixString(16)));
+
+      env.DeleteLocalRef(jres);
+    }
+    env.DeleteLocalRef(longClass);
+    arena.releaseAll();
+  });
+}

jni/example/pubspec.lock

@@ -1,6 +1,13 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.11"
   async:
     dependency: transitive
     description:
@@ -43,6 +50,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.16.0"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -64,11 +78,23 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.1"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.1.2"
   flutter:
     dependency: "direct main"
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_driver:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -81,6 +107,16 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  fuchsia_remote_debug_protocol:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  integration_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   jni:
     dependency: "direct main"
     description:
@@ -117,19 +153,33 @@ packages:
     source: hosted
     version: "1.7.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.1"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.0"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.2.4"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -163,6 +213,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
+  sync_http:
+    dependency: transitive
+    description:
+      name: sync_http
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.0"
   term_glyph:
     dependency: transitive
     description:
@@ -177,12 +234,33 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.9"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "8.2.2"
+  webdriver:
+    dependency: transitive
+    description:
+      name: webdriver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
 sdks:
   dart: ">=2.17.5 <3.0.0"

jni/example/pubspec.yaml

@@ -31,7 +31,7 @@ dependencies:
     sdk: flutter
 
   ffi:
-
+  path:
   jni:
     # When depending on this package from a real application you should use:
     #   jni: ^x.y.z
@@ -47,6 +47,8 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  integration_test:
+    sdk: flutter
 
   # The "flutter_lints" package below contains a set of recommended lints to
   # encourage good coding practices. The lint set provided by the package is