OutsideJqwikException升级后的简单测试用例

Question

测试问题

我编写了下面的示例代码，并在intelliJ上运行它，并一直在v1.5.0+上获得相同的异常。相同的代码在1.4.0和更低的版本上工作得很好.

下面是示例代码，我将实际测试代码简化为：

import java.util.Random;
import net.jqwik.api.Arbitraries;
import net.jqwik.api.Arbitrary;
import net.jqwik.api.Combinators;

public class Test {

    public static Arbitrary<String> testing() {
        return Combinators.withBuilder(StringBuilder::new)
            .use(Arbitraries.of("123")).in(StringBuilder::append)
            .build(StringBuilder::toString);
    }

    @org.junit.jupiter.api.Test
    public void test() {
        testing().generator(0).next(new Random()).value();
    }
}

堆栈跟踪：

net.jqwik.engine.execution.lifecycle.OutsideJqwikException: The current action must be run on a jqwik thread, i.e. container, property or hook.
Maybe you spawned off a thread?

    at net.jqwik.engine.execution.lifecycle.CurrentTestDescriptor.get(CurrentTestDescriptor.java:50)
    at net.jqwik.engine.facades.StoreFacadeImpl.get(StoreFacadeImpl.java:24)
    at net.jqwik.api.lifecycle.Store.get(Store.java:92)
    at net.jqwik.api.lifecycle.Store.getOrCreate(Store.java:68)
    at net.jqwik.engine.facades.Memoize.generatorStore(Memoize.java:13)
    at net.jqwik.engine.facades.Memoize.memoizedGenerator(Memoize.java:26)
    at net.jqwik.engine.facades.ArbitraryFacadeImpl.memoizedGenerator(ArbitraryFacadeImpl.java:221)
    at net.jqwik.api.Arbitrary.generator(Arbitrary.java:92)
    at net.jqwik.api.Combinators$Combinator2$1.rawGenerator(Combinators.java:264)
    at net.jqwik.api.Combinators$Combinator2$1.generator(Combinators.java:255)
    at net.jqwik.engine.facades.ArbitraryFacadeImpl$2.generator(ArbitraryFacadeImpl.java:79)
    at com.test.my.code.project.Test.test(Test.java:18)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
    at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
    at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
    at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService.invokeAll(ForkJoinPoolHierarchicalTestExecutorService.java:129)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
    at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService.invokeAll(ForkJoinPoolHierarchicalTestExecutorService.java:129)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at org.junit.platform.engine.support.hierarchical.ForkJoinPoolHierarchicalTestExecutorService$ExclusiveTask.compute(ForkJoinPoolHierarchicalTestExecutorService.java:185)
    at java.base/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:189)
    at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
    at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
    at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
    at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
    at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)


Process finished with exit code 255

删除generate(int).

• Changing的
• 将使测试通过，所以从.example到.example的异常或者使用@
• 标记似乎也有帮助，但我认为我不需要这样做，因为这是升级后的一个新问题。

Answer 1

jqwik不再支持以这种方式使用生成器。相反，您必须使用：Arbitrary.sample()或Arbitrary.sampleStream()来生成@Property或@Example方法之外的值：

@org.junit.jupiter.api.Test
public void test() {
    testing().sample();
}

其原因是，有效地产生价值需要相当多的状态机在罩下。要获得更多指导，您应该阅读https://jqwik.net/docs/current/user-guide.html#using-arbitraries-directly，特别是https://jqwik.net/docs/current/user-guide.html#using-arbitraries-outside-jqwik-lifecycle。

此外，至少使用1.5.6版的jqwik，更好的是使用最新的1.6.1版本。

想到的另一个问题是:为什么要自己生成样本而不使用jqwik的生命周期？这有几个合理的原因，但是标准用例已经被@Example和@Property所涵盖了。