doc/dev: testing guidelines update for GN-105 (!30789) · Merge requests · Administrator / sourcegraph · GitLab

Administrator requested to merge testing-guidelines into main Feb 08, 2022

Created by: bobheadxi

Incorporates changes from https://github.com/sourcegraph/handbook/pull/2055 into the testing principles page, which is now testing principles and guidelines.

Closes https://github.com/sourcegraph/sourcegraph/issues/29894 , closes https://github.com/sourcegraph/sourcegraph/issues/29764 , closes https://github.com/sourcegraph/sourcegraph/issues/29889

Enforcement: https://github.com/sourcegraph/sourcegraph/pull/30278