How to test only one benchmark function? - unit-testing

Question

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.

Answer 1

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=^$

Answer 2

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

Answer 3

Test only TestFuncOne
$>> go test -run TestFuncOne
stuff_to_test.go
TestFuncOne() {
}
TestFuncTwo() {
}