A method performed by an interaction test system for enabling interaction in a test environment between a first test object comprising a vehicle and a vehicle occupant supporting one or more driving assistance functions, or supporting at least partially autonomous driving, and at least a second test object adapted to communicate directly or indirectly with said first test object , wherein during a test session, said first test object is situated within a first physical test environment and said at least second test object comprising a vulnerable road user, VRU, or a second vehicle and a second vehicle occupant thereof is situated within at least a second physical test environment physically separated from said first test environment , said method comprising: providing a first virtual reality layer associated with said first test environment , to said first test object , and at least a second virtual reality layer associated with said at least second test environment , to said at least second test object , such that a mixed reality perceived by said first test object corresponds to a mixed reality perceived by said at least second test object ; and continuously, periodically, or intermittently: deriving first object data associated with said first test object , said first object data comprising status information and/or actions of said first test object ; providing first object behaviour data based on said first object data , to said at least second virtual reality layer, such that at least a portion of said status information and/or actions of said first test object , are comprised in the mixed reality perceived by said at least second test object ; deriving at least second object data associated with said at least second test object , said at least second object data comprising status information and/or actions of said at least second test object ; and providing at least second object behaviour data based on said at least second object data , to said first virtual reality layer, such that at least a portion of said status information and/or actions of said at least second test object are comprised in the mixed reality perceived by the first test object . providing a first virtual reality layer associated with said first test environment , to said first test object , and at least a second virtual reality layer associated with said at least second test environment , to said at least second test object , such that a mixed reality perceived by said first test object corresponds to a mixed reality perceived by said at least second test object ; and continuously, periodically, or intermittently: deriving first object data associated with said first test object , said first object data comprising status information and/or actions of said first test object ; providing first object behaviour data based on said first object data , to said at least second virtual reality layer, such that at least a portion of said status information and/or actions of said first test object , are comprised in the mixed reality perceived by said at least second test object ; deriving at least second object data associated with said at least second test object , said at least second object data comprising status information and/or actions of said at least second test object ; and providing at least second object behaviour data based on said at least second object data , to said first virtual reality layer, such that at least a portion of said status information and/or actions of said at least second test object are comprised in the mixed reality perceived by the first test object . <EOS>