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Josh Bleecher Snyder 4bb2c6980d util/testingutil: new package with MinAllocsPerRun ... testing.AllocsPerRun measures the total allocations performed by the entire program while repeatedly executing a function f. If some unrelated part of the rest of the program happens to allocate a lot during that period, you end up with a test failure. Ideally, the rest of the program would be silent while testing.AllocsPerRun executes. Realistically, that is often unachievable. AllocsPerRun attempts to mitigate this by setting GOMAXPROCS to 1, but that doesn't prevent other code from running; it only makes it less likely. You can also mitigate this by passing a large iteration count to AllocsPerRun, but that is unreliable and needlessly expensive. Unlike most of package testing, AllocsPerRun doesn't use any toolchain magic, so we can just write a replacement. One wild idea is to change how we count mallocs. Instead of using runtime.MemStats, turn on memory profiling with a memprofilerate of 1. Discard all samples from the profile whose stack does not contain testing.AllocsPerRun. Count the remaining samples to determine the number of mallocs. That's fun, but overkill. Instead, this change adds a simple API that attempts to get f to run at least once with a target number of allocations. This is useful when you know that f should allocate consistently. We can then assume that any iterations with too many allocations are probably due to one-time costs or background noise. This suits most uses of AllocsPerRun. Ratcheting tests tend to be significantly less flaky, because they are biased towards success. They can also be faster, because they can exit early, once success has been reached. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>		3 years ago
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integration	control/controlclient,tailcfg: propagate registration errors to the frontend	3 years ago
natlab	fix: typo spelling grammar	3 years ago
staticcheck	tstest/staticcheck: import the main package to fix "go mod tidy"	4 years ago
allocs.go	util/testingutil: new package with MinAllocsPerRun	3 years ago
clock.go	tstest/natlab: add a stateful firewall.	4 years ago
log.go	tstest: make MemLogger.String acquire its mutex	3 years ago
log_test.go	tstest: rename LogListener to LogLineTracker	4 years ago
resource.go	net/dns{,/resolver}: refactor DNS forwarder, send out of right link on macOS/iOS	3 years ago
tstest.go	tstest: add WaitFor helper	4 years ago