DA may prosecute or not, Subject to the rules of evidence, DA may have you testify, and will likely help you organize your story for the best presentation of HIS case before the jury.
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Since this is a criminal case it is up to the DA if they want you to testify or not. The DA could plead your husband out, in which case there won't be a trial.
Please note that this answer does not constitute legal advice, and should not be relied on, as each situation is fact specific, and it is not possible to evaluate a legal problem without a comprehensive consultation and review of all the facts and court pleadings filed in the case. This answer does not create an attorney-client relationship.
Should the DA choose to take this case to trial, it is likely that you will be asked to testify because you are the victim in the case and you have the details of the incident. As previously mentioned, if the DA chooses to make an offer and your boyfriend pleads then you will not testify. Additionally, the court may give an indicated sentence that is acceptable to your boyfriend and he may enter a plea as charged without risking a trial.