testing: (*testing.Benchmark).Log always logs

[jeffallen]

With this benchmark:

package main
import "testing"
func BenchmarkLog(b *testing.B) {
b.Log("why?")
}

I get this output:

$ go test -bench .
testing: warning: no tests to run
PASS
BenchmarkLog 2000000000 0.00 ns/op
--- BENCH: BenchmarkLog
issue_test.go:6: why?
issue_test.go:6: why?
issue_test.go:6: why?
issue_test.go:6: why?
issue_test.go:6: why?
issue_test.go:6: why?

The docs say, "The text will be printed only if the test fails or the -test.v flag is set."

Why is b.Log logging anyway?

[ianlancetaylor]

I think this is a documentation issue. The code says:

        // Unlike with tests, we ignore the -chatty flag and always print output for
        // benchmarks since the output generation time will skew the results.

[jeffallen]

Thanks guys. Great service!