vim-patch:7.4.503 #2178

Problem:    Cannot append a list of lines to a file.
Solution:   Add the append option to writefile(). (Yasuhiro Matsumoto)

https://code.google.com/p/vim/source/detail?r=v7-4-503

-Ported old legacy test over to
    test/functional/legacy/writefile_spec.lua
-Tests for mapping and signs from the original patch were removed since
    they have nothing to do this with feature

Tested with: make oldtest, make test on OS X.

Signed-off-by: Perry Hung <iperry@gmail.com>

test/functional/legacy/writefile_spec.lua

@@ -0,0 +1,30 @@
+-- Tests for writefile()
+
+local helpers = require('test.functional.helpers')
+local feed, insert, source = helpers.feed, helpers.insert, helpers.source
+local clear, execute, expect = helpers.clear, helpers.execute, helpers.expect
+
+describe('writefile', function()
+  setup(clear)
+
+  it('is working', function()
+    execute('%delete _')
+    execute('let f = tempname()')
+    execute('call writefile(["over","written"], f, "b")')
+    execute('call writefile(["hello","world"], f, "b")')
+    execute('call writefile(["!", "good"], f, "a")')
+    execute('call writefile(["morning"], f, "ab")')
+    execute('call writefile(["", "vimmers"], f, "ab")')
+    execute('bwipeout!')
+    execute('$put =readfile(f)')
+    execute('1 delete _')
+
+    -- Assert buffer contents.
+    expect([[
+      hello
+      world!
+      good
+      morning
+      vimmers]])
+  end)
+end)