legacy tests: migrate test7

src/nvim/testdir/test7.in

@@ -1,26 +0,0 @@
-Test for autocommand that changes the buffer list, when doing ":ball".
-
-STARTTEST
-:so small.vim
-/^start of
-A1:.,/end of/w! Xxx1   " write test file Xxx1
-:sp Xxx1
-:close
-$r2:.,/end of/w! Xxx2    " write test file Xxx2
-:sp Xxx2
-:close
-$r3:.,/end of/w! Xxx3    " write test file Xxx3
-:sp Xxx3
-:close
-:au BufReadPost Xxx2 bwipe
-$r4:ball                 " open window for all args, close Xxx2
-:.,$w! test.out          " Write contents of this file
-:w >>test.out        " Append contents of second window (Xxx1)
-:/^start of/,$w >>test.out   " Append contents of last window (this file)
-:qa!
-ENDTEST
-
-start of test file Xxx
-	this is a test
-	this is a test
-end of test file Xxx

src/nvim/testdir/test7.ok

@@ -1,12 +0,0 @@
-start of test file Xxx4
-	this is a test
-	this is a test
-end of test file Xxx
-start of test file Xxx1
-	this is a test
-	this is a test
-end of test file Xxx
-start of test file Xxx4
-	this is a test
-	this is a test
-end of test file Xxx

test/functional/legacy/007_ball_buffer_list_spec.lua

@@ -0,0 +1,77 @@
+-- Test for autocommand that changes the buffer list, when doing ":ball".
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe(':ball', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      start of test file Xxx
+          this is a test
+          this is a test
+      end of test file Xxx]])
+
+    execute('w! Xxx0')
+    feed('gg')
+
+    -- Write test file Xxx1
+    feed('A1:.,/end of/w! Xxx1<cr>')
+    execute('sp Xxx1')
+    execute('close')
+
+    -- Write test file Xxx2
+    feed('$r2:.,/end of/w! Xxx2<cr>')
+    execute('sp Xxx2')
+    execute('close')
+
+    -- Write test file Xxx3
+    feed('$r3:.,/end of/w! Xxx3<cr>')
+    execute('sp Xxx3')
+    execute('close')
+
+    execute('au BufReadPost Xxx2 bwipe')
+
+    -- Open window for all args, close Xxx2
+    feed('$r4:ball<cr>')
+   
+    -- Write contents of this file
+    execute('%yank A')
+    
+    -- Append contents of second window (Xxx1) 
+    feed('')
+    execute('%yank A')
+
+    -- Append contents of last window (this file)
+    feed('')
+    execute('%yank A')
+
+    execute('bf')
+    execute('%d')
+    execute('0put=@a')
+    execute('1d | $d')
+
+    expect([[
+      start of test file Xxx4
+          this is a test
+          this is a test
+      end of test file Xxx
+      start of test file Xxx1
+          this is a test
+          this is a test
+      end of test file Xxx
+      start of test file Xxx4
+          this is a test
+          this is a test
+      end of test file Xxx]])
+  end)
+
+  teardown(function()
+    os.remove('Xxx0')
+    os.remove('Xxx1')
+    os.remove('Xxx2')
+    os.remove('Xxx3')
+  end)
+end)