alibaba/Sentinel

Flaky test

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#2,974 opened on Nov 26, 2022

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area/testgood first issue

Description

Issue Description

Bug report

Describe what happened (or what feature you want)

The test com.alibaba.csp.sentinel.adapter.reactor.MonoSentinelOperatorIntegrationTest.testEmitSingleLongTimeRt fails when run by itself. But it passes when other methods run before it. Thus, the test is flaky Acc. to the definitions mentioned in IDOFT.

Describe what you expected to happen

The test should pass when run on its own.

How to reproduce it (as minimally and precisely as possible)

Run the test on its own. It will fail. Run the test class. It will pass.

Tell us your environment

Java 1.8 Windows 10 Education. Maven 3.6.3

Anything else we need to know?

Contributor guide

Tech stack
java
Domain
testing
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaJUnit testingMaven
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Examine the test class com.alibaba.csp.sentinel.adapter.reactor.MonoSentinelOperatorIntegrationTest, specifically the method testEmitSingleLongTimeRt. Investigate why the test only passes when run with other tests, likely due to shared state or test ordering. Look for static fields, mocked objects, or reactor context that may persist between tests. Consider adding @Before or @After methods to reset state, or use @DirtiesContext to ensure a fresh context for this test.