diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index e75cb71..2975464 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -204,6 +204,21 @@
   set formatexpr=
 endfunc
 
+" When 'formatexpr' returns non-zero, internal formatting is used.
+func Test_normal_formatexpr_returns_nonzero()
+  new
+  call setline(1, ['one', 'two'])
+  func! Format()
+    return 1
+  endfunc
+  setlocal formatexpr=Format()
+  normal VGgq
+  call assert_equal(['one two'], getline(1, '$'))
+  setlocal formatexpr=
+  delfunc Format
+  close!
+endfunc
+
 " basic test for formatprg
 func Test_normal06_formatprg()
   " only test on non windows platform
diff --git a/src/testdir/test_textformat.vim b/src/testdir/test_textformat.vim
index 49c1f06..f4792b9 100644
--- a/src/testdir/test_textformat.vim
+++ b/src/testdir/test_textformat.vim
@@ -1091,6 +1091,17 @@
   setlocal fo+=aw tw=10
   call feedkeys("iabc abc a abc\<Esc>k0weade", 'xt')
   call assert_equal(['abc abcde ', 'a abc'], getline(1, '$'))
+
+  " Test for 'a', 'w' and '1' options.
+  setlocal textwidth=0
+  setlocal fo=1aw
+  %d
+  call setline(1, '. foo')
+  normal 72ig
+  call feedkeys('a uu uu uu', 'xt')
+  call assert_equal('g uu uu ', getline(1)[-8:])
+  call assert_equal(['uu. foo'], getline(2, '$'))
+
   %bw!
 endfunc
 
@@ -1113,4 +1124,185 @@
   %bw!
 endfunc
 
+" Test for formatting lines using gq in visual mode
+func Test_visual_gq_format()
+  new
+  call setline(1, ['one two three four', 'five six', 'one two'])
+  setl textwidth=10
+  call feedkeys('ggv$jj', 'xt')
+  redraw!
+  normal gq
+  %d
+  call setline(1, ['one two three four', 'five six', 'one two'])
+  normal G$
+  call feedkeys('v0kk', 'xt')
+  redraw!
+  normal gq
+  setl textwidth&
+  close!
+endfunc
+
+" Test for 'n' flag in 'formatoptions' to format numbered lists
+func Test_fo_n()
+  new
+  setlocal autoindent
+  setlocal textwidth=12
+  setlocal fo=n
+  call setline(1, ['  1) one two three four', '  2) two'])
+  normal gggqG
+  call assert_equal(['  1) one two', '     three', '     four', '  2) two'],
+        \ getline(1, '$'))
+  close!
+endfunc
+
+" Test for 'formatlistpat' option
+func Test_formatlistpat()
+  new
+  setlocal autoindent
+  setlocal textwidth=10
+  setlocal fo=n
+  setlocal formatlistpat=^\\s*-\\s*
+  call setline(1, ['  - one two three', '  - two'])
+  normal gggqG
+  call assert_equal(['  - one', '    two', '    three', '  - two'],
+        \ getline(1, '$'))
+  close!
+endfunc
+
+" Test for the 'b' and 'v' flags in 'formatoptions'
+" Text should wrap only if a space character is inserted at or before
+" 'textwidth'
+func Test_fo_b()
+  new
+  setlocal textwidth=20
+
+  setlocal formatoptions=t
+  call setline(1, 'one two three four')
+  call feedkeys('Amore', 'xt')
+  call assert_equal(['one two three', 'fourmore'], getline(1, '$'))
+
+  setlocal formatoptions=bt
+  %d
+  call setline(1, 'one two three four')
+  call feedkeys('Amore five', 'xt')
+  call assert_equal(['one two three fourmore five'], getline(1, '$'))
+
+  setlocal formatoptions=bt
+  %d
+  call setline(1, 'one two three four')
+  call feedkeys('A five', 'xt')
+  call assert_equal(['one two three four', 'five'], getline(1, '$'))
+
+  setlocal formatoptions=vt
+  %d
+  call setline(1, 'one two three four')
+  call feedkeys('Amore five', 'xt')
+  call assert_equal(['one two three fourmore', 'five'], getline(1, '$'))
+
+  close!
+endfunc
+
+" Test for the '1' flag in 'formatoptions'. Don't wrap text after a one letter
+" word.
+func Test_fo_1()
+  new
+  setlocal textwidth=20
+
+  setlocal formatoptions=t
+  call setline(1, 'one two three four')
+  call feedkeys('A a bird', 'xt')
+  call assert_equal(['one two three four a', 'bird'], getline(1, '$'))
+
+  %d
+  setlocal formatoptions=t1
+  call setline(1, 'one two three four')
+  call feedkeys('A a bird', 'xt')
+  call assert_equal(['one two three four', 'a bird'], getline(1, '$'))
+
+  close!
+endfunc
+
+" Test for 'l' flag in 'formatoptions'. When starting insert mode, if a line
+" is longer than 'textwidth', then it is not broken.
+func Test_fo_l()
+  new
+  setlocal textwidth=20
+
+  setlocal formatoptions=t
+  call setline(1, 'one two three four five')
+  call feedkeys('A six', 'xt')
+  call assert_equal(['one two three four', 'five six'], getline(1, '$'))
+
+  %d
+  setlocal formatoptions=tl
+  call setline(1, 'one two three four five')
+  call feedkeys('A six', 'xt')
+  call assert_equal(['one two three four five six'], getline(1, '$'))
+
+  close!
+endfunc
+
+" Test for the '2' flag in 'formatoptions'
+func Test_fo_2()
+  new
+  setlocal autoindent
+  setlocal formatoptions=t2
+  setlocal textwidth=30
+  call setline(1, ["\tfirst line of a paragraph.",
+        \ "second line of the same paragraph.",
+        \ "third line."])
+  normal gggqG
+  call assert_equal(["\tfirst line of a",
+        \ "paragraph.  second line of the",
+        \ "same paragraph.  third line."], getline(1, '$'))
+  close!
+endfunc
+
+" Test for formatting lines where only the first line has a comment.
+func Test_fo_gq_with_firstline_comment()
+  new
+  setlocal formatoptions=tcq
+  call setline(1, ['- one two', 'three'])
+  normal gggqG
+  call assert_equal(['- one two three'], getline(1, '$'))
+
+  %d
+  call setline(1, ['- one', '- two'])
+  normal gggqG
+  call assert_equal(['- one', '- two'], getline(1, '$'))
+  close!
+endfunc
+
+" Test for trying to join a comment line with a non-comment line
+func Test_join_comments()
+  new
+  call setline(1, ['one', '/* two */', 'three'])
+  normal gggqG
+  call assert_equal(['one', '/* two */', 'three'], getline(1, '$'))
+  close!
+endfunc
+
+" Test for using 'a' in 'formatoptions' with comments
+func Test_autoformat_comments()
+  new
+  setlocal formatoptions+=a
+  call feedkeys("a- one\n- two\n", 'xt')
+  call assert_equal(['- one', '- two', ''], getline(1, '$'))
+
+  %d
+  call feedkeys("a\none\n", 'xt')
+  call assert_equal(['', 'one', ''], getline(1, '$'))
+
+  setlocal formatoptions+=aw
+  %d
+  call feedkeys("aone \ntwo\n", 'xt')
+  call assert_equal(['one two', ''], getline(1, '$'))
+
+  %d
+  call feedkeys("aone\ntwo\n", 'xt')
+  call assert_equal(['one', 'two', ''], getline(1, '$'))
+
+  close!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 105df76..d35cbab 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    686,
+/**/
     685,
 /**/
     684,