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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testing
func TestBenchmarkBLoop(t *T) {
var initialStart highPrecisionTime
var firstStart highPrecisionTime
var lastStart highPrecisionTime
var runningEnd bool
runs := 0
iters := 0
finalBN := 0
bRet := Benchmark(func(b *B) {
initialStart = b.start
runs++
for b.Loop() {
if iters == 0 {
firstStart = b.start
}
lastStart = b.start
iters++
}
finalBN = b.N
runningEnd = b.timerOn
})
// Verify that a b.Loop benchmark is invoked just once.
if runs != 1 {
t.Errorf("want runs == 1, got %d", runs)
}
// Verify that at least one iteration ran.
if iters == 0 {
t.Fatalf("no iterations ran")
}
// Verify that b.N, bRet.N, and the b.Loop() iteration count match.
if finalBN != iters || bRet.N != iters {
t.Errorf("benchmark iterations mismatch: %d loop iterations, final b.N=%d, bRet.N=%d", iters, finalBN, bRet.N)
}
// Make sure the benchmark ran for an appropriate amount of time.
if bRet.T < benchTime.d {
t.Fatalf("benchmark ran for %s, want >= %s", bRet.T, benchTime.d)
}
// Verify that the timer is reset on the first loop, and then left alone.
if firstStart == initialStart {
t.Errorf("b.Loop did not reset the timer")
}
if lastStart != firstStart {
t.Errorf("timer was reset during iteration")
}
// Verify that it stopped the timer after the last loop.
if runningEnd {
t.Errorf("timer was still running after last iteration")
}
}
// See also TestBenchmarkBLoop* in other files.
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