" Typically, Boeing tests the wings and components separately, while Airbus tests entire assemblies.'
Partly right- mostly wrong. While BA does test some items separately, they always test two complete structures.
One airframe is used for a static test of a complete but non flyable structure to ultimate- wings, body- usually but not always to destruction when the wings are bent up to failure. . The other is a fatigue test - wings, body pressurized, etc to simulate a typiical takeoff and cruise and landing cycle. Go to the Boeing site for some facts and data.
for example
Static test complete
Boeing Moves 787 Dreamliner Fatigue Test Airframe to Testing Rig - Feb 02, 2010
https://www.youtube.com/watch?v=Ai2HmvAXcU0
https://www.youtube.com/watch?v=UFSh04Zl4Yw
"
LiveLeak com Boeing 787 Dreamliner Wing Loading Test-- its the 777 !
note the video labeled 787 is actually the 777 wing test in 1995 - I wuz there !!