Hi. There are a few common strategies to testing an experiment before running live traffic at it.
1. Clone the experiment for use in a dev/staging environment; change the tracking key. This is probably the cleanest option.
2. Use a separate experiment phase (phase 1 = QA, phase 2 = live experiment)
3. Wipe the QA data in your datasource before starting and/or use a separate datasource for QA