legacy tests: migrate test7

test/functional/legacy/007_ball_buffer_list_spec.lua

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+-- 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)