如何仅测试一个基准功能？

In my Go package there are several benchmark files like map1_benchmark_test.go and map2_benchmark_test.go. In every *_benchmark_test.go file, there is more than one benchmark function like func BenchmarkMapTravel(b *testing.B) and func BenchmarkMapGet(b *testing.B).

Question is, how can I test just one benchmark function?

I attempted to read some manuals, and got nothing about benchmark by running go help test.

Description of testing flags

-test.bench pattern
    Run benchmarks matching the regular expression.
    By default, no benchmarks run.

-test.run pattern
    Run only those tests and examples matching the regular
    expression.

For convenience, each of these -test.X flags of the test binary is also available as the flag -X in 'go test' itself.

For help,

$ go help testflag

For example,

go test -test.bench MapTravel
go test -test.bench MapGet

or

go test -bench MapTravel
go test -bench MapGet

To bypass test functions, include a -test.run pattern that filters out every single test. For example,

go test -test.bench MapTravel -test.run=thisexpressionwontmatchanytest

or

go test -bench MapTravel -run=^$

Test only TestFuncOne

$>> go test -run TestFuncOne

stuff_to_test.go

TestFuncOne() {
}

TestFuncTwo() {
}

There is no flag you can provide, that will run only benchmarks (or only one benchmark). The only flags related to these are:

-bench regexp Run benchmarks matching the regular expression. By default, no benchmarks run. To run all benchmarks, use '-bench .' or '-bench=.'.

-run regexp Run only those tests and examples matching the regular expression.

So if you want only to run one benchmark, you can do this:

go test -bench=nameOfYourBenchmark -run=^a

This will cause to run only tests that starts with a. And because each test should be named Test<something>, there will be no tests to run.

To run only benchmarks:

go test -bench=. -run=^a