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.