pkgs/jni/test/exception_test.dart

// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:io';

import 'package:test/test.dart';
import 'package:jni/jni.dart';

import 'test_util/test_util.dart';

void main() {
  if (!Platform.isAndroid) {
    checkDylibIsUpToDate();
    bool caught = false;
    try {
      // If library does not exist, a helpful error should be thrown.
      // we can't test this directly because `test` schedules functions
      // asynchronously.
      Jni.spawn(dylibDir: "wrong_dir");
    } on HelperNotFoundError catch (_) {
      // stderr.write("\n$_\n");
      spawnJvm();
      caught = true;
    } on JniVmExistsError {
      stderr.writeln('cannot verify: HelperNotFoundError thrown');
    }
    if (!caught) {
      throw "Expected HelperNotFoundException\n"
          "Read exception_test.dart for details.";
    }
  }
  run(testRunner: test);
}

void run({required TestRunnerCallback testRunner}) {
  JObject newRandom(JClass randomClass) {
    return randomClass
        .constructorId('()V')
        .call(randomClass, const JObjectType(), []);
  }

  testRunner("double free throws exception", () {
    final rc = JClass.forName('java/util/Random');
    final r = newRandom(rc);
    r.release();
    expect(r.release, throwsA(isA<DoubleReleaseError>()));
  });

  testRunner("Use after free throws exception", () {
    final rc = JClass.forName('java/util/Random');
    final r = newRandom(rc);
    r.release();
    expect(
        () => rc
            .instanceMethodId("nextInt", "(I)I")
            .call(r, const jintType(), [JValueInt(256)]),
        throwsA(isA<UseAfterReleaseError>()));
  });

  testRunner("An exception in JNI throws JniException in Dart", () {
    final rc = JClass.forName('java/util/Random');
    final r = newRandom(rc);
    expect(
        () => rc
            .instanceMethodId("nextInt", "(I)I")
            .call(r, const jintType(), [JValueInt(-1)]),
        throwsA(isA<JniException>()));
  });
}