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io: add test for Pipe constructor allocations

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Updates #67633

Change-Id: If3da9317ba36cb8a7868db94b45c402e1793e018
Reviewed-on: https://go-review.googlesource.com/c/go/+/588219
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Cuong Manh Le 2024-05-24 23:41:22 +07:00 • committed by Gopher Robot
parent d0146bd85b
commit b43d6c57de
1 changed files with 18 additions and 0 deletions
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18
src/io/pipe_test.go
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@ -421,3 +421,21 @@ func sortBytesInGroups(b []byte, n int) []byte {
slices.SortFunc(groups, bytes.Compare)
return bytes.Join(groups, nil)
}
var (
rSink *PipeReader
wSink *PipeWriter
)
func TestPipeAllocations(t *testing.T) {
numAllocs := testing.AllocsPerRun(10, func() {
rSink, wSink = Pipe()
})
// go.dev/cl/473535 claimed Pipe() should only do 2 allocations,
// plus the 2 escaping to heap for simulating real world usages.
expectedAllocs := 4
if int(numAllocs) > expectedAllocs {
t.Fatalf("too many allocations for io.Pipe() call: %f", numAllocs)
}
}