legacy tests: migrate test5

src/nvim/testdir/test5.in

@@ -1,29 +0,0 @@
-Test for autocommand that deletes the current buffer on BufLeave event.
-Also test deleting the last buffer, should give a new, empty buffer.
-
-STARTTEST
-:so small.vim
-:au BufLeave Xxx bwipe
-/start of
-:.,/end of/w! Xxx               " write test file Xxx
-:sp Xxx                         " split to Xxx
-:bwipe                          " delete buffer Xxx, now we're back here
-G?this is a
-othis is some more text
-:                               " Append some text to this file
-:?start?,$w! test.out           " Write current file contents
-:bwipe test.out                 " delete alternate buffer
-:au bufleave test5.in bwipe
-:bwipe!                         " delete current buffer, get an empty one
-ithis is another test line:w >>test.out
-:                               " append an extra line to the output file
-:qa!
-ENDTEST
-
-start of test file Xxx
-vim: set noai :
-	this is a test
-	this is a test
-	this is a test
-	this is a test
-end of test file Xxx

src/nvim/testdir/test5.ok

@@ -1,9 +0,0 @@
-start of test file Xxx
-vim: set noai :
-	this is a test
-	this is a test
-	this is a test
-	this is a test
-this is some more text
-end of test file Xxx
-this is another test line