patch 8.2.0898: missing help for a function goes unnoticed

Problem:    Missing help for a function goes unnoticed.
Solution:   Add a test. (Gary Johnson)

src/testdir/Make_all.mak

@@ -139,6 +139,7 @@ NEW_TESTS = \
 	test_fnamemodify \
 	test_fold \
 	test_functions \
+	test_function_lists \
 	test_ga \
 	test_getcwd \
 	test_getvar \
@@ -374,6 +375,7 @@ NEW_TESTS_RES = \
 	test_fnameescape.res \
 	test_fold.res \
 	test_functions.res \
+	test_function_lists.res \
 	test_getcwd.res \
 	test_getvar.res \
 	test_gf.res \

src/testdir/test_function_lists.vim

@@ -0,0 +1,105 @@
+" Test to verify that the three function lists,
+"
+"   global_functions[] in src/evalfunc.c
+"   *functions* in runtime/doc/eval.txt
+"   *function-list* in runtime/doc/usr_41.txt
+"
+" contain the same functions and that the global_functions and ":help
+" functions" lists are in ASCII order.
+
+func Test_function_lists()
+
+  " Delete any files left over from an earlier run of this test.
+
+  call delete("Xglobal_functions.diff")
+  call delete("Xfunctions.diff")
+  call delete("Xfunction-list.diff")
+
+  " Create a file of the functions in evalfunc.c:global_functions[].
+
+  enew!
+  read ../evalfunc.c
+  1,/^static funcentry_T global_functions\[\] =$/d
+  call search('^};$')
+  .,$d
+  v/^    {/d
+  %s/^    {"//
+  %s/".*//
+  w! Xglobal_functions
+
+  " Verify that those functions are in ASCII order.
+
+  sort u
+  w! Xsorted_global_functions
+  let l:unequal = assert_equalfile("Xsorted_global_functions", "Xglobal_functions",
+      \ "global_functions[] not sorted")
+  if l:unequal && executable("diff")
+    call system("diff -u Xsorted_global_functions Xglobal_functions > Xglobal_functions.diff")
+  endif
+
+  " Create a file of the functions in evalfunc.c:global_functions[] that are
+  " not obsolete, sorted in ASCII order.
+
+  enew!
+  read ../evalfunc.c
+  1,/^static funcentry_T global_functions\[\] =$/d
+  call search('^};$')
+  .,$d
+  v/^    {/d
+  g/\/\/ obsolete$/d
+  %s/^    {"//
+  %s/".*//
+  sort u
+  w! Xsorted_current_global_functions
+
+  " Verify that the ":help functions" list is complete and in ASCII order.
+
+  enew!
+  read ../../runtime/doc/eval.txt
+  call search('\*functions\*$')
+  call search('^USAGE')
+  1,.d
+  call search('\*\K\k*()\*$')
+  .,$d
+  v/^\S/d
+  %s/(.*//
+  let l:lines = getline(1, '$')
+  call uniq(l:lines)
+  call writefile(l:lines, "Xfunctions")
+  let l:unequal = assert_equalfile("Xsorted_current_global_functions", "Xfunctions",
+      \ "\":help functions\" not sorted or incomplete")
+  if l:unequal && executable("diff")
+    call system("diff -u Xsorted_current_global_functions Xfunctions > Xfunctions.diff")
+  endif
+
+  " Verify that the ":help function-list" list is complete.
+
+  enew!
+  read ../../runtime/doc/usr_41.txt
+  call search('\*function-list\*$')
+  1,.d
+  call search('^==*$')
+  .,$d
+  v/^\t\S/d
+  %s/(.*//
+  %left
+  sort u
+  w! Xfunction-list
+  let l:unequal = assert_equalfile("Xsorted_current_global_functions", "Xfunction-list",
+      \ "\":help functions-list\" incomplete")
+  if l:unequal && executable("diff")
+    call system("diff -u Xsorted_current_global_functions Xfunction-list > Xfunction-list.diff")
+  endif
+
+  " Clean up.
+
+  call delete("Xglobal_functions")
+  call delete("Xsorted_global_functions")
+  call delete("Xsorted_current_global_functions")
+  call delete("Xfunctions")
+  call delete("Xfunction-list")
+  enew!
+
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    898,
 /**/
     897,
 /**/