src/test/java/io/reactivex/rxjava4/exceptions/ExceptionsTest.java - 4.x - githubmirror/RxJava

src/test/java/io/reactivex/rxjava4/exceptions/ExceptionsTest.java
198 строк6 KB
David Karnok
4.x: Streamable + range, fromArray, take, error, defer (#8206)
01 июл 2026, 10:11
01 июл 2026, 10:1193d6ddd
/*
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
 * the License for the specific language governing permissions and limitations under the License.
 */

package io.reactivex.rxjava4.exceptions;

import static org.junit.jupiter.api.Assertions.*;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.jupiter.api.Test;

import io.reactivex.rxjava4.core.*;
import io.reactivex.rxjava4.disposables.Disposable;
import io.reactivex.rxjava4.internal.util.ExceptionHelper;
import io.reactivex.rxjava4.plugins.RxJavaPlugins;
import io.reactivex.rxjava4.subjects.PublishSubject;
import io.reactivex.rxjava4.testsupport.TestHelper;

public class ExceptionsTest extends RxJavaTest {

    @Test
    public void constructorShouldBePrivate() {
        TestHelper.checkUtilityClass(ExceptionHelper.class);
    }

    @Test
    public void onErrorNotImplementedIsThrown() {
        List<Throwable> errors = TestHelper.trackPluginErrors();

        Observable.just(1, 2, 3).subscribe(_ -> {
            throw new RuntimeException("hello");
        });

        TestHelper.assertError(errors, 0, RuntimeException.class);
        assertTrue(errors.getFirst().getMessage().contains("hello"), errors.getFirst().toString());
        RxJavaPlugins.reset();
    }

    @Test
    public void stackOverflowWouldOccur() {
        final PublishSubject<Integer> a = PublishSubject.create();
        final PublishSubject<Integer> b = PublishSubject.create();
        final int MAX_STACK_DEPTH = 800;
        final AtomicInteger depth = new AtomicInteger();

        a.subscribe(new Observer<>() /* NFI */ {

            @Override
            public void onSubscribe(Disposable d) {

            }

            @Override
            public void onComplete() {

            }

            @Override
            public void onError(Throwable e) {
                e.printStackTrace();
            }

            @Override
            public void onNext(Integer n) {
                b.onNext(n + 1);
            }
        });
        b.subscribe(new Observer<>() /* NFI */ {

            @Override
            public void onSubscribe(Disposable d) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onComplete() {

            }

            @Override
            public void onError(Throwable e) {
                e.printStackTrace();
            }

            @Override
            public void onNext(Integer n) {
                if (depth.get() < MAX_STACK_DEPTH) {
                    depth.set(Thread.currentThread().getStackTrace().length);
                    a.onNext(n + 1);
                }
            }
        });
        a.onNext(1);
        assertTrue(depth.get() >= MAX_STACK_DEPTH);
    }

    @Test
    public void stackOverflowErrorIsThrown() {
        assertThrows(StackOverflowError.class, () -> {
            Observable.just(1).subscribe(new Observer<>() /* NFI */ {

                @Override
                public void onSubscribe(Disposable d) {

                }

                @Override
                public void onComplete() {

                }

                @Override
                public void onError(Throwable e) {
                    e.printStackTrace();
                }

                @Override
                public void onNext(Integer t) {
                    throw new StackOverflowError();
                }

            });
        });
    }

    @Test
    public void utilityClass() {
        TestHelper.checkUtilityClass(Exceptions.class);
    }

    @Test
    public void manualPropagate() {

        try {
            Exceptions.propagate(new InternalError());
            fail("Didn't throw exception");
        } catch (InternalError ex) {
            // expected
        }

        try {
            throw Exceptions.propagate(new IllegalArgumentException());
        } catch (IllegalArgumentException ex) {
            // expected
        }

        try {
            throw ExceptionHelper.wrapOrThrow(new IOException());
        } catch (RuntimeException ex) {
            if (!(ex.getCause() instanceof IOException)) {
                fail(ex.toString() + ": should have thrown RuntimeException(IOException)");
            }
        }
    }

    @Test
    public void errorNotImplementedNull1() {
        OnErrorNotImplementedException ex = new OnErrorNotImplementedException(null);

        assertTrue(ex.getCause() instanceof NullPointerException, "" + ex.getCause());
    }

    @Test
    public void errorNotImplementedNull2() {
        OnErrorNotImplementedException ex = new OnErrorNotImplementedException("Message", null);

        assertTrue(ex.getCause() instanceof NullPointerException, "" + ex.getCause());
    }

    @Test
    public void errorNotImplementedWithCause() {
        OnErrorNotImplementedException ex = new OnErrorNotImplementedException("Message", new TestException("Forced failure"));

        assertTrue(ex.getCause() instanceof TestException, "" + ex.getCause());

        assertEquals("Forced failure", ex.getCause().getMessage(), "" + ex.getCause());
    }

    @Test
    public void throwIfFatalLinkageError() {
        assertThrows(LinkageError.class, () -> {
            Exceptions.throwIfFatal(new LinkageError());
        });
    }
}