legacy tests: migrate test28

src/nvim/testdir/test28.ok

@@ -1,2 +0,0 @@
-sd
-map __2 asdsecondsdsd0map __5 asd0fifth

test/functional/legacy/028_source_ctrl_v_spec.lua

@@ -0,0 +1,40 @@
+-- Test for sourcing a file with CTRL-V's at the end of the line
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe('CTRL-V at the end of the line', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      firstline
+      map __1 afirst
+      map __2 asecond
+      map __3 athird
+      map __4 afourth
+      map __5 afifth
+      map __1 asdX
+      map __2 asdXX
+      map __3 asdXX
+      map __4 asdXXX
+      map __5 asdXXX
+      lastline]])
+
+    feed(':%s/X/<C-v><C-v>/g<cr>')
+    feed(':/firstline/+1,/lastline/-1w! Xtestfile<cr>')
+    execute('so Xtestfile')
+    execute('%d')
+    feed('Gmm__1<Esc><Esc>__2<Esc>__3<Esc><Esc>__4<Esc>__5<Esc>')
+    feed(":'m,$s/<C-v><C-@>/0/g<cr>")
+
+    expect([[
+      sd
+      map __2 asdsecondsdsd0map __5 asd0fifth]])
+  end)
+
+  teardown(function()
+    os.remove('Xtestfile')
+  end)
+end)