The tests were first spotted by frequent social media app tipster Jean Manchun Wong, who notes that the feature is available on Android devices in select markets.
Facebook Messenger, seemingly due to prolonged external nagging, has started public testing Dark Mode in certain countries
They have put up a fair warning that Dark Mode isn't everywhere yet so don't complain when some UI burns your eyes off
— Jane "not Facebook Employee" Manchun Wong (@wongmjane) December 31, 2018
It’s unclear which markets are receiving the test, however. For example, I’ve been unable to find a dark mode setting anywhere in Messenger on my iPhone 7 Plus.
Those who are in the testing areas can find the feature under the ‘Me’ section of the Messenger app.
“We’re conducting a small test of dark mode in a handful of markets,” a Facebook Messenger spokesperson said in an emailed statement to CNET. “We don’t have anything further to share at this time.”
In other Messenger news, Facebook is also testing an ‘unsend’ feature.