The Reds made it nine goals from two pre-season outings but were given a much tougher ride against French third tier outfit Toulon than they were last week at Stalybridge.
Barnsley made the perfect start, opening the scoring in the first minute through Cauley Woodrow who escaped to go one-on-one with the keeper and score with a lovely dink.
However throughout the match the Reds defence look shaky and were often exposed on the counter with the first outing as pair for Aapo Halme and Bambo Diaby proving it needs more work on the training ground.
The uncertainty saw Toulon turn the deficit around by the 20th minute mark, first through a penalty given for handball against Halme within minutes of Woodrow's opener and then from one of many counters finishing off a low cross into the area.
The frentic pace of the first half would continue with Woodrow making it 2-2 almost instantly with a lovely finish across the goalkeeper.
Incredibly Barnsley were back in front after 37minutes with a lovely passing move in midfield ending with Cameron McGeehan feeding Mike Bahre to finish from eight yards.
The scoring was complete a minute before half-time when Barnsley were awarded a penalty for a foul on Ben Williams and Woodrow completed his hattrick- just moments after Toulon had struck the post after again exposing the Reds on the counter.
Barnsley did have the chance to score five for the second friendly in a row but new recruit from Derby County Luke Thomas saw the third penalty of the match saved.
First half XI:
Brad Collins
Ben Williams
Aapo Halme
Bambo Diaby
Toby Sibbick
Mamdou Thiam
Alex Mowatt
Cameron McGeehan
Jacob Brown
Mike Bahre
Cauley Woodrow
Second half XI:
Brad Collins
Dimitri Cavare
Mads Anderson
Bambo Diaby
Ben Williams
Alex Mowatt
Cameron McGeehan
Jordan Green
Callum Styles
Luke Thomas
Cauley Woodrow
Second half subsititues:
60mins (George Miller and Victor Adeboyejo for Mowatt and Woodrow)
72mins (Jordan Helliwell, Jasper Moon and Aiden Marsh for McGeehan, Diaby and Williams)