Test Door (Portal 2)
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A Test Door corresponds to the double round doors found in the regular testing course. One of the sides displays Portal 2's Exit symbol. In the official levels following the introduction chapter, that type of door is used specifically in test chambers to show the beginning and the end of the test chamber, in order to separate unrelated puzzles (as opposed to Portal where that type of door can be found in the middle of the course as an integral puzzle element).
prop_testchamber_door is the main entity that creates the door visuals, collisions and sounds. Its corresponding instance makes use of areaportals, tweaks and further exploit prevention mechanisms.