Tag link test: design test framework

[abeddow91]

The next test to be run will be the "tag link" test. We need to determine the test framework for this.

Test framework document. ](https://docs.google.com/document/d/1FH5nghUZytjxE-Nt6T6ryx0UHwP8k92HjN7Ne7CB-ws/edit)

To be determined:

• [x] Audience sample size of control / variant
• [x] Test duration
• [x] Start and end date