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

test/functional/legacy/005_bufleave_delete_buffer.lua

@@ -0,0 +1,71 @@
+-- Test for autocommand that deletes the current buffer on BufLeave event.
+-- Also test deleting the last buffer, should give a new, empty buffer.
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe('test5', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      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]])
+
+    execute('w! Xxx0')
+    execute('au BufLeave Xxx bwipe')
+    execute('/start of')
+
+    -- Write test file Xxx.
+    execute('.,/end of/w! Xxx')
+
+    -- Split to Xxx.
+    execute('sp Xxx')
+
+    -- Delete buffer Xxx, now we're back here.
+    execute('bwipe')
+    feed('G?this is a<cr>')
+    feed('othis is some more text<esc>')
+
+    -- Append some text to this file.
+
+    -- Write current file contents.
+    execute('?start?,$yank A')
+
+    -- Delete alternate buffer.
+    execute('bwipe test.out')
+    execute('au bufleave test5.in bwipe')
+
+    -- Delete current buffer, get an empty one.
+    execute('bwipe!')
+    feed('ithis is another test line<esc>:yank A<cr>')
+
+    -- Output results
+    execute('%d')
+    execute('0put a')
+    execute('1d | $d')
+
+    -- Assert buffer contents.
+    expect([[
+      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]])
+  end)
+
+  teardown(function()
+    os.remove('Xxx')
+    os.remove('Xxx0')
+  end)
+end)