如何单位测试返回Uni/Multi的Smallrye变反应库？

Question

我在我的夸克应用程序中使用Smallrye反应库，因为它在夸克应用程序中是本地支持的。

我试图为服务类编写单元测试。我不知道如何为返回Uni/Multi.的方法编写单元测试

一种返回Uni<String>的方法

public Uni<String> hello(final String name) {
    final String message = "Hello " + name;
    return Uni.createFrom().item(message);
}

为上述方法实现的单元

@Test
void testHello() {
    final Uni<String> casePass = hello("Ram");
    // assertion passes and all good with this.
    casePass.subscribe().with(message -> Assertions.assertEquals("Hello Ram", message));
    
    final Uni<String> caseFail = hello("Ravan");
    //  It is expected to fail the assertion, and it does. But the test is not failing, instead aseertion fail message simply logged to the console.
    caseFail.subscribe().with(message -> Assertions.assertEquals("Hello Sita", message));
}

控制台日志

[-- Mutiny had to drop the following exception --]
Exception received by: io.smallrye.mutiny.helpers.UniCallbackSubscriber.onItem(UniCallbackSubscriber.java:71)
org.opentest4j.AssertionFailedError: expected: <Hello Sita> but was: <Hello Ram>
    at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
    at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
    at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
    at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
    at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1124)
...

Answer 1

有几种方法。您可以使用Smallrye.io/小型化/叛变/指南/测试中提供的实用方法。但是，如果根据您的评论，您需要更多信息，我建议您采用以下方法：

final Uni<Greeting> casePass = hello("Ram");
Greeting g = casePAss.await().atMost(Duration.ofSeconds(5)); // To be sure we don't stay tucked
// Assertions come here

所以，基本上，你阻止，直到项目被发送。避免使用await().indefinitely()，因为如果Uni从未发送项目，它可能会阻塞您的测试。如果Uni发送失败，await()...并不会抛出异常。

Answer 2

我真的推荐使用来自SmallRey的测试方式。

https://smallrye.io/smallrye-mutiny/1.7.0/guides/testing/

例如，您仍然可以从多个/uni使用调用中获取对象。

 public static Uni<String> hello(final String name) {
    final String message = "Hello " + name;
    return Uni.createFrom().item(message);
}

@Test
public void testUnit() {
    UniAssertSubscriber<String> tester = hello("someone")
            .invoke( i -> Assertions.assertEquals("Hello someone", i))
            .invoke(i -> Assertions.assertNotNull(i))
            .subscribe().withSubscriber(UniAssertSubscriber.create());
    tester.assertCompleted();
}

@Test
public void secondUnit() {
    UniAssertSubscriber<String> tester = hello("none")
            .invoke( i -> Assertions.assertEquals("Hello someone", i))
            .invoke(i -> Assertions.assertNotNull(i))
            .subscribe().withSubscriber(UniAssertSubscriber.create());
    tester.assertCompleted();
}

我希望你能那样使用它