[3] Shortly thereafter, he entered territorial politics and ran for Kam Lake's seat in the Legislative Assembly, defeating incumbent cabinet minister Dave Ramsay in a two-way contest.
[5] In 2018, Testart introduced an amendment to the territorial Elections Act to permit the introduction of party politics in the legislative assembly,[6] but his motion received no support from other MLAs and was dropped.
[7] In 2019, he planned to organize a group of ideologically aligned MLA candidates in the 2019 Northwest Territories general election under the banner of a would-be "Liberal Democratic" slate.
[8] Ultimately, Testart would abandon the project, scrapping any electoral alliance between candidates, and remained an independent after claiming "there was a concerted campaign of disinformation" that undermined his efforts.
The only candidate who was not previously a cabinet minister, after Shane Thompson dropped out before the vote, Testart surprisingly overcame fellow Yellowknife area MLA Caroline Wawzonek, and placed second to Hay River North's R.J. Simpson.