Manuel Pellegrini's men were playing their final friendly game before they start their Premier League campaign in Austria by beating their French opponents.
The 'Irons' have been active in the transfer market, and their new stars such as Jack Wilshere and club-record signing Felipe Anderson were on show in the match.
The east London club were positive in the game, and had several good chances through Anderson and Michail Antonio to decisively dispatch Angers, but both players failed to convert their efforts.
However, experienced striker Javier Hernandez was the decisive player in the contest.
Full-back Aaron Cresswell whipped in a ball in to the box, where the Mexican talisman was waiting to pounce on the ball and send it in to the top corner of the opposition's net.
West Ham will next play Liverpool, as they get their Premier League season under way at Anfield on 12th August.