Add -race to list when it is specified for test options

[shibayu36]

The build cache is completely different between go test and go test -race. Therefore, if you run go test and then go test -race, it will recompile.

Now gotosplit does not specify -race in go test -list even if -race is specified in the test options. Therefore, when -race is specified, go test is executed in test list creation, and go test -race is executed in test execution. As a result, the compilation is run twice.

gotesplit -total 4 -index 0 -junit-dir=build/test-results . /playground -- -race

So, in this PR, if -race is specified, change it so that -race is also specified when go test -list is used.

confirm

In addition to adding the test, I checked that the options are correct with printf debugging.

# on https://github.com/shibayu36/go-playground
$ gotesplit -total 4 -index 0 -junit-dir=build/test-results ./playground -- -race
[test -list . -race ./playground]
$ gotesplit -total 4 -index 0 -junit-dir=build/test-results ./playground
[test -list . ./playground]
$ gotesplit -total 4 -index 0 -junit-dir=build/test-results ./playground -- -p 1
[test -list . ./playground]

[Songmu]

I see. This is small but important.

[Songmu]

Released as v0.3.1.