>Why you expect that junior developer (someone with very little or no development experience)

I don't think thats the definition of a junior developer. Test tools are apart of building software, you should be hiring devs that have created projects that use tests of some sort, if not with the technology you're using.

>I expect that junior developer in software field should be able to program only.

I don't know how you can have little to no dev experience and know how to program.