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Flaky parallel/test-repl-history-navigation #31094

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BridgeAR opened this issue Dec 25, 2019 · 3 comments
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Flaky parallel/test-repl-history-navigation #31094

BridgeAR opened this issue Dec 25, 2019 · 3 comments
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@BridgeAR
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flaky-test Issues and PRs related to the tests with unstable failures on the CI. repl Issues and PRs related to the REPL subsystem. test Issues and PRs related to the tests.

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@BridgeAR
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I added this test recently and it actually checks a race condition. Seems like the test itself is not solid enough tough.

20:40:29 not ok 1604 parallel/test-repl-history-navigation
20:40:29   ---
20:40:29   duration_ms: 3.189
20:40:29   severity: fail
20:40:29   exitcode: 1
20:40:29   stack: |-
20:40:29     Failed test # 6
20:40:29     Last outputs: [
20:40:29       �[32m"'> '"�[39m,
20:40:29       �[32m"'€'"�[39m,
20:40:29       �[32m"' // WOW'"�[39m,
20:40:29       �[32m"'> '"�[39m,
20:40:29       �[32m"'s'"�[39m,
20:40:29       �[32m"' // Always visible'"�[39m,
20:40:29       �[32m"'> '"�[39m,
20:40:29       �[32m"'€'"�[39m,
20:40:29       �[32m"' // WOW'"�[39m
20:40:29     ]
20:40:29     /usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd11-x64/test/parallel/test-repl-history-navigation.js:357
20:40:29                 throw e;
20:40:29                 ^
20:40:29     
20:40:29     AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
20:40:29     + actual - expected
20:40:29     
20:40:29     + ' // WOW'
20:40:29     - '> '
20:40:29         at Writable.write [as _write] (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd11-x64/test/parallel/test-repl-history-navigation.js:351:20)
20:40:29         at doWrite (_stream_writable.js:453:12)
20:40:29         at writeOrBuffer (_stream_writable.js:435:5)
20:40:29         at Writable.write (_stream_writable.js:326:11)
20:40:29         at Timeout._onTimeout (internal/repl/utils.js:231:19)
20:40:29         at listOnTimeout (internal/timers.js:551:17)
20:40:29         at processTimers (internal/timers.js:492:7) {
20:40:29       generatedMessage: true,
20:40:29       code: 'ERR_ASSERTION',
20:40:29       actual: ' // WOW',
20:40:29       expected: '> ',
20:40:29       operator: 'strictEqual'
20:40:29     }
@BridgeAR BridgeAR added repl Issues and PRs related to the REPL subsystem. test Issues and PRs related to the tests. flaky-test Issues and PRs related to the tests with unstable failures on the CI. labels Dec 25, 2019
@BridgeAR BridgeAR self-assigned this Dec 25, 2019
@richardlau richardlau mentioned this issue Jan 8, 2020
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@addaleax
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addaleax commented Feb 6, 2020

This seems easy to reproduce by changing common.platformTimeout(40) to common.platformTimeout(400) in the test.

Is there a chance we could remove the timeouts entirely? There shouldn’t be any in a REPL test, I think.

@BridgeAR
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BridgeAR commented Feb 9, 2020

@addaleax we never specified if a custom completion function may be async or not. Right now async is accepted and if someone types fast the completion could be triggered multiple times. In that case only the very last triggered completion should be accepted. We could pause the stream during the completion instead of using a counter but it's not possible to keep on typing while the completion is running in that case.

@addaleax
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addaleax commented Feb 9, 2020

@BridgeAR I assumed that completion functions may be async, but I don’t understand why that would need to be modelled though timers in the test?

@BridgeAR BridgeAR mentioned this issue Feb 9, 2020
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codebytere pushed a commit that referenced this issue Feb 17, 2020
@BridgeAR @codebytere
test: fix flaky parallel/test-repl-history-navigation test
6dbe6bd 
Two scenarios should be tested:

1. The completion is triggered and the result is printed before the
   next invocation.
2. The completion is triggered multiple times right after each other
   without waiting for the result. In that case only the last result
   should be printed.

The first scenario did not need a timeout while the latter did not
need a timeout for the second invocation.

PR-URL: #31708
Fixes: #31094
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: James M Snell <[email protected]>
targos pushed a commit to targos/node that referenced this issue Apr 25, 2020
@BridgeAR @targos
test: fix flaky parallel/test-repl-history-navigation test
3475eb8 
Two scenarios should be tested:

1. The completion is triggered and the result is printed before the
   next invocation.
2. The completion is triggered multiple times right after each other
   without waiting for the result. In that case only the last result
   should be printed.

The first scenario did not need a timeout while the latter did not
need a timeout for the second invocation.

PR-URL: nodejs#31708
Fixes: nodejs#31094
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: James M Snell <[email protected]>
targos pushed a commit that referenced this issue Apr 28, 2020
@BridgeAR @targos
test: fix flaky parallel/test-repl-history-navigation test
8a044cb 
Two scenarios should be tested:

1. The completion is triggered and the result is printed before the
   next invocation.
2. The completion is triggered multiple times right after each other
   without waiting for the result. In that case only the last result
   should be printed.

The first scenario did not need a timeout while the latter did not
need a timeout for the second invocation.

PR-URL: #31708
Fixes: #31094
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: James M Snell <[email protected]>
@snyk-bot snyk-bot mentioned this issue Jun 1, 2021
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test: fix flaky parallel/test-repl-history-navigation test BridgeAR/node
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