test:close-top-level-window

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`test:close-top-level-window`

Use this function to simulate clicking on the close box of a frame.

(test:close-top-level-window frame) -> void
frame : (instance frame%)
Closes frame with this expression:
```
(when (send frame can-close?)
  (send frame on-close)
  (send frame show #f))
```