diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 1c0c715..49d2de0 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -75,7 +75,6 @@
 	test108.out \
 	test_autocmd_option.out \
 	test_autoformat_join.out \
-	test_breakindent.out \
 	test_changelist.out \
 	test_close_count.out \
 	test_comparators.out \
@@ -141,6 +140,7 @@
 	    test_assert.res \
 	    test_autochdir.res \
 	    test_backspace_opt.res \
+	    test_breakindent.res \
 	    test_bufwintabinfo.res \
 	    test_cdo.res \
 	    test_channel.res \
diff --git a/src/testdir/test_breakindent.in b/src/testdir/test_breakindent.in
deleted file mode 100644
index d286931..0000000
--- a/src/testdir/test_breakindent.in
+++ /dev/null
@@ -1,122 +0,0 @@
-Test for breakindent
-
-STARTTEST
-:so small.vim
-:if !exists("+breakindent") | e! test.ok | w! test.out | qa! | endif
-:10new|:vsp|:vert resize 20
-:put =\"\tabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP\"
-:set ts=4 sw=4 sts=4 breakindent
-:fu! ScreenChar(line, width)
-:	let c=''
-:	for i in range(1,a:width)
-:		let c.=nr2char(screenchar(a:line, i))
-:	endfor
-:       let c.="\n"
-:	for i in range(1,a:width)
-:		let c.=nr2char(screenchar(a:line+1, i))
-:	endfor
-:       let c.="\n"
-:	for i in range(1,a:width)
-:		let c.=nr2char(screenchar(a:line+2, i))
-:	endfor
-:	return c
-:endfu
-:fu DoRecordScreen()
-:	wincmd l
-:	$put =printf(\"\n%s\", g:test)
-:	$put =g:line1
-:	wincmd p
-:endfu
-:set briopt=min:0
-:let g:test="Test 1: Simple breakindent"
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:let g:test="Test 2: Simple breakindent + sbr=>>"
-:set sbr=>>
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:let g:test ="Test 3: Simple breakindent + briopt:sbr"
-:set briopt=sbr,min:0 sbr=++
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:let g:test ="Test 4: Simple breakindent + min width: 18"
-:set sbr= briopt=min:18
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:let g:test =" Test 5: Simple breakindent + shift by 2"
-:set briopt=shift:2,min:0
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:let g:test=" Test 6: Simple breakindent + shift by -1"
-:set briopt=shift:-1,min:0
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:let g:test=" Test 7: breakindent + shift by +1 + nu + sbr=? briopt:sbr"
-:set briopt=shift:1,sbr,min:0 nu sbr=? nuw=4
-:let line1=ScreenChar(line('.'),10)
-:call DoRecordScreen()
-:let g:test=" Test 8: breakindent + shift:1 + nu + sbr=# list briopt:sbr"
-:set briopt=shift:1,sbr,min:0 nu sbr=# list
-:let line1=ScreenChar(line('.'),10)
-:call DoRecordScreen()
-:let g:test=" Test 9: breakindent + shift by +1 + 'nu' + sbr=# list"
-:set briopt-=sbr
-:let line1=ScreenChar(line('.'),10)
-:call DoRecordScreen()
-:let g:test=" Test 10: breakindent + shift by +1 + 'nu' + sbr=~ cpo+=n"
-:set cpo+=n sbr=~ nu nuw=4 nolist briopt=sbr,min:0
-:let line1=ScreenChar(line('.'),10)
-:call DoRecordScreen()
-:wincmd p
-:let g:test="\n Test 11: strdisplaywidth when breakindent is on"
-:set cpo-=n sbr=>> nu nuw=4 nolist briopt= ts=4
-:let text=getline(2) "skip leading tab when calculating text width
-:let width = strlen(text[1:])+indent(2)*4+strlen(&sbr)*3 " text wraps 3 times
-:$put =g:test
-:$put =printf(\"strdisplaywidth: %d == calculated: %d\", strdisplaywidth(text), width)
-:let g:str="\t\t\t\t\t{"
-:let g:test=" Test 12: breakindent + long indent"
-:wincmd p
-:set all& breakindent linebreak briopt=min:10 nu numberwidth=3 ts=4
-:$put =g:str
-zt:let line1=ScreenChar(1,10)
-:wincmd p
-:call DoRecordScreen()
-:"
-:" Test, that the string "    a\tb\tc\td\te" is correctly
-:" displayed in a 20 column wide window (see bug report
-:" https://groups.google.com/d/msg/vim_dev/ZOdg2mc9c9Y/TT8EhFjEy0IJ
-:only
-:vert 20new
-:set all& nocp breakindent briopt=min:10
-:call setline(1, ["    a\tb\tc\td\te", "    z   y       x       w       v"])
-:/^\s*a
-fbgjyl:let line1 = @0
-:?^\s*z
-fygjyl:let line2 = @0
-:quit!
-:$put ='Test 13: breakindent with wrapping Tab'
-:$put =line1
-:$put =line2
-:"
-:let g:test="Test 14: breakindent + visual blockwise delete #1"
-:set all& breakindent viminfo+=nviminfo
-:30vnew
-:normal! 3a1234567890
-:normal! a    abcde
-:exec "normal! 0\<C-V>tex"
-:let line1=ScreenChar(line('.'),8)
-:call DoRecordScreen()
-:"
-:let g:test="Test 15: breakindent + visual blockwise delete #2"
-:%d
-:normal! 4a1234567890
-:exec "normal! >>\<C-V>3f0x"
-:let line1=ScreenChar(line('.'),20)
-:call DoRecordScreen()
-:quit!
-:"
-:%w! test.out
-:qa!
-ENDTEST
-dummy text
diff --git a/src/testdir/test_breakindent.ok b/src/testdir/test_breakindent.ok
deleted file mode 100644
index 3eb9c24..0000000
--- a/src/testdir/test_breakindent.ok
+++ /dev/null
@@ -1,74 +0,0 @@
-
-	abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP
-
-Test 1: Simple breakindent
-    abcd
-    qrst
-    GHIJ
-
-Test 2: Simple breakindent + sbr=>>
-    abcd
-    >>qr
-    >>EF
-
-Test 3: Simple breakindent + briopt:sbr
-    abcd
-++  qrst
-++  GHIJ
-
-Test 4: Simple breakindent + min width: 18
-    abcd
-  qrstuv
-  IJKLMN
-
- Test 5: Simple breakindent + shift by 2
-    abcd
-      qr
-      EF
-
- Test 6: Simple breakindent + shift by -1
-    abcd
-   qrstu
-   HIJKL
-
- Test 7: breakindent + shift by +1 + nu + sbr=? briopt:sbr
-  2     ab
-?        m
-?        x
-
- Test 8: breakindent + shift:1 + nu + sbr=# list briopt:sbr
-  2 ^Iabcd
-#      opq
-#      BCD
-
- Test 9: breakindent + shift by +1 + 'nu' + sbr=# list
-  2 ^Iabcd
-       #op
-       #AB
-
- Test 10: breakindent + shift by +1 + 'nu' + sbr=~ cpo+=n
-  2     ab
-~       mn
-~       yz
-
- Test 11: strdisplaywidth when breakindent is on
-strdisplaywidth: 46 == calculated: 64
-					{
-
- Test 12: breakindent + long indent
-56        
-          
-~         
-Test 13: breakindent with wrapping Tab
-d
-w
-
-Test 14: breakindent + visual blockwise delete #1
-e       
-~       
-~       
-
-Test 15: breakindent + visual blockwise delete #2
-        1234567890  
-~                   
-~                   
diff --git a/src/testdir/test_breakindent.vim b/src/testdir/test_breakindent.vim
new file mode 100644
index 0000000..bf363dc
--- /dev/null
+++ b/src/testdir/test_breakindent.vim
@@ -0,0 +1,241 @@
+" Test for breakindent
+"
+" Note: if you get strange failures when adding new tests, it might be that
+" while the test is run, the breakindent cacheing gets in its way.
+" It helps to change the tabastop setting and force a redraw (e.g. see
+" Test_breakindent08())
+if !exists('+breakindent')
+  finish
+endif
+
+let s:input ="\tabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP"
+
+function s:screenline(lnum, width) abort
+  " always get 4 screen lines
+  redraw!
+  let line = []
+  for j in range(3)
+    for c in range(1, a:width)
+  call add(line, nr2char(screenchar(a:lnum+j, c)))
+    endfor
+    call add(line, "\n")
+  endfor
+  return join(line, '')
+endfunction
+
+function s:testwindows(...)
+  10new
+  vsp
+  vert resize 20
+  setl ts=4 sw=4 sts=4 breakindent 
+  put =s:input
+  if a:0
+    exe a:1
+  endif
+endfunction
+
+function s:close_windows(...)
+  bw!
+  if a:0
+    exe a:1
+  endif
+  unlet! g:line g:expect
+endfunction
+
+function Test_breakindent01()
+  " simple breakindent test
+  call s:testwindows('setl briopt=min:0')
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="    abcd\n    qrst\n    GHIJ\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows()
+endfunction
+
+function Test_breakindent02()
+  " simple breakindent test with showbreak set
+  call s:testwindows('setl briopt=min:0 sbr=>>')
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="    abcd\n    >>qr\n    >>EF\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent03()
+  " simple breakindent test with showbreak set and briopt including sbr
+  call s:testwindows('setl briopt=sbr,min:0 sbr=++')
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="    abcd\n++  qrst\n++  GHIJ\n"
+  call assert_equal(g:expect, g:line)
+  " clean up
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent04()
+  " breakindent set with min width 18
+  call s:testwindows('setl sbr= briopt=min:18')
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="    abcd\n  qrstuv\n  IJKLMN\n"
+  call assert_equal(g:expect, g:line)
+  " clean up
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent05()
+  " breakindent set and shift by 2
+  call s:testwindows('setl briopt=shift:2,min:0')
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="    abcd\n      qr\n      EF\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows()
+endfunction
+
+function Test_breakindent06()
+  " breakindent set and shift by -1
+  call s:testwindows('setl briopt=shift:-1,min:0')
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="    abcd\n   qrstu\n   HIJKL\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows()
+endfunction
+
+function Test_breakindent07()
+  " breakindent set and shift by 1, Number  set sbr=? and briopt:sbr
+  call s:testwindows('setl briopt=shift:1,sbr,min:0 nu sbr=? nuw=4 cpo+=n')
+  let g:line=s:screenline(line('.'),10)
+  let g:expect="  2     ab\n?        m\n?        x\n"
+  call assert_equal(g:expect, g:line)
+  " clean up
+  call s:close_windows('set sbr= cpo-=n')
+endfunction
+
+function Test_breakindent07a()
+  " breakindent set and shift by 1, Number  set sbr=? and briopt:sbr
+  call s:testwindows('setl briopt=shift:1,sbr,min:0 nu sbr=? nuw=4')
+  let g:line=s:screenline(line('.'),10)
+  let g:expect="  2     ab\n    ?    m\n    ?    x\n"
+  call assert_equal(g:expect, g:line)
+  " clean up
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent08()
+  " breakindent set and shift by 1, Number and list set sbr=# and briopt:sbr
+  call s:testwindows('setl briopt=shift:1,sbr,min:0 nu nuw=4 sbr=# list cpo+=n ts=4')
+  " make sure, cache is invalidated!
+  set ts=8
+  redraw!
+  set ts=4
+  redraw!
+  let g:line=s:screenline(line('.'),10)
+  let g:expect="  2 ^Iabcd\n#      opq\n#      BCD\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows('set sbr= cpo-=n')
+endfunction
+
+function Test_breakindent08a()
+  " breakindent set and shift by 1, Number and list set sbr=# and briopt:sbr
+  call s:testwindows('setl briopt=shift:1,sbr,min:0 nu nuw=4 sbr=# list')
+  let g:line=s:screenline(line('.'),10)
+  let g:expect="  2 ^Iabcd\n    #  opq\n    #  BCD\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent09()
+  " breakindent set and shift by 1, Number and list set sbr=#
+  call s:testwindows('setl briopt=shift:1,min:0 nu nuw=4 sbr=# list')
+  let g:line=s:screenline(line('.'),10)
+  let g:expect="  2 ^Iabcd\n       #op\n       #AB\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent10()
+  " breakindent set, Number set sbr=~
+  call s:testwindows('setl cpo+=n sbr=~ nu nuw=4 nolist briopt=sbr,min:0')
+  " make sure, cache is invalidated!
+  set ts=8
+  redraw!
+  set ts=4
+  redraw!
+  let g:line=s:screenline(line('.'),10)
+  let g:expect="  2     ab\n~       mn\n~       yz\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows('set sbr= cpo-=n')
+endfunction
+
+function Test_breakindent11()
+  " test strdisplaywidth()
+  call s:testwindows('setl cpo-=n sbr=>> nu nuw=4 nolist briopt= ts=4')
+  let text=getline(2)
+  let width = strlen(text[1:])+indent(2)+strlen(&sbr)*3 " text wraps 3 times
+  call assert_equal(width, strdisplaywidth(text))
+  call s:close_windows('set sbr=')
+endfunction
+
+function Test_breakindent12()
+  " test breakindent with long indent
+  let s:input="\t\t\t\t\t{"
+  call s:testwindows('setl breakindent linebreak briopt=min:10 nu numberwidth=3 ts=4 list listchars=tab:>-')
+  let g:line=s:screenline(2,16)
+  let g:expect=" 2 >--->--->--->\n          ---{  \n~               \n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows('set nuw=4 listchars=')
+endfunction
+
+function Test_breakindent13()
+  let s:input=""
+  call s:testwindows('setl breakindent briopt=min:10 ts=8')
+  vert resize 20
+  call setline(1, ["    a\tb\tc\td\te", "    z   y       x       w       v"])
+  1
+  norm! fbgj"ayl
+  2
+  norm! fygj"byl
+  call assert_equal('d', @a)
+  call assert_equal('w', @b)
+  call s:close_windows()
+endfunction
+
+function Test_breakindent14()
+  let s:input=""
+  call s:testwindows('setl breakindent briopt= ts=8')
+  vert resize 30
+  norm! 3a1234567890
+  norm! a    abcde
+  exec "norm! 0\<C-V>tex"
+  let g:line=s:screenline(line('.'),8)
+  let g:expect="e       \n~       \n~       \n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows()
+endfunction
+
+function Test_breakindent15()
+  let s:input=""
+  call s:testwindows('setl breakindent briopt= ts=8 sw=8')
+  vert resize 30
+  norm! 4a1234567890
+  exe "normal! >>\<C-V>3f0x"
+  let g:line=s:screenline(line('.'),20)
+  let g:expect="        1234567890  \n~                   \n~                   \n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows()
+endfunction
+
+function Test_breakindent16()
+  " Check that overlong lines are indented correctly.
+  " TODO: currently it does not fail even when the bug is not fixed.
+  let s:input=""
+  call s:testwindows('setl breakindent briopt=min:0 ts=4')
+  call setline(1, "\t".repeat("1234567890", 10))
+  resize 6
+  norm! 1gg$
+  redraw!
+  let g:line=s:screenline(1,10)
+  let g:expect="    123456\n    789012\n    345678\n"
+  call assert_equal(g:expect, g:line)
+  let g:line=s:screenline(4,10)
+  let g:expect="    901234\n    567890\n    123456\n"
+  call assert_equal(g:expect, g:line)
+  call s:close_windows()
+endfunction