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testutils: add ExpectExactNTimes function to LogObserver #18637

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@clement2026 clement2026 commented Sep 25, 2024

Context #18635 (comment)

#18635 needs this.

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Hi @clement2026. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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All modified and coverable lines are covered by tests ✅

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@@            Coverage Diff             @@
##             main   #18637      +/-   ##
==========================================
+ Coverage   68.77%   68.81%   +0.03%     
==========================================
  Files         420      420              
  Lines       35535    35535              
==========================================
+ Hits        24439    24452      +13     
+ Misses       9666     9651      -15     
- Partials     1430     1432       +2     

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// ExpectExactNTimes returns all lines that satisfy the filter if there are
// exactly `count` of them when the duration ends. Otherwise, it returns an error.
// Make sure ctx has a timeout longer than duration for ExpectExactNTimes to work properly.
func (logOb *LogObserver) ExpectExactNTimes(ctx context.Context, s string, count int, duration time.Duration) ([]string, error) {
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Don't use duration, timeout should be passed via context.

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Do we really need to check if compacted Raft log occured at most N times? This is hard to check, why checking if "compact-index": X is not enough ?

// Expect returns the first N lines containing the given string.
func (logOb *LogObserver) Expect(ctx context.Context, s string, count int) ([]string, error) {
// ExpectAtLeastNTimes returns the first N lines containing the given string.
func (logOb *LogObserver) ExpectAtLeastNTimes(ctx context.Context, s string, count int) ([]string, error) {
return logOb.ExpectFunc(ctx, func(log string) bool { return strings.Contains(log, s) }, count)
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Please update the Expect function instead.
Current implementation of expect should be renamed to ExpectNMatches

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PR needs rebase.

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