Very importantly, this hasn't been described as a "test failure."
That was heavily implied:
Sources tell KOMO there was a stunned silence after it happened.
…
an event occurred that forced the test team to halt testing. … The team is currently working to understand what happened and ensure the area is safe for work to continue.
Edit: You're not going to silence the crowd with a successful test and you don't temporarily halt testing because of a successful test.
Edit 2: Seattle Times says this explicitly: This ground test failure is another blow.
Yes, but this isn't the language they'd use if one of the test success criteria was "no door blows out" and then a door blows out.
This is evidenced by their plan to "analyze the door and run the test again." If this were actually a test failure, they'd be "analyzing the door, redesigning a bunch of stuff, and running the test again."
That was heavily implied:
Sources tell KOMO there was a stunned silence after it happened.
…
an event occurred that forced the test team to halt testing. … The team is currently working to understand what happened and ensure the area is safe for work to continue.
Edit: You're not going to silence the crowd with a successful test and you don't temporarily halt testing because of a successful test.
Edit 2: Seattle Times says this explicitly: This ground test failure is another blow.