patch 8.2.0342: some code in ex_getln.c not covered by tests

Problem:    Some code in ex_getln.c not covered by tests.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5717)
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 8c58026..c32a3f0 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -1188,6 +1188,7 @@
 func Test_cmdline_edit()
   let str = ":one two\<C-U>"
   let str ..= "one two\<C-W>\<C-W>"
+  let str ..= "one\<BS>\<C-H>\<Del>"
   let str ..= "\<Left>five\<Right>"
   let str ..= "\<Home>two "
   let str ..= "\<C-Left>one "
@@ -1206,6 +1207,7 @@
   set rightleftcmd=search
   let str = "/one two\<C-U>"
   let str ..= "one two\<C-W>\<C-W>"
+  let str ..= "one\<BS>\<C-H>\<Del>"
   let str ..= "\<Right>five\<Left>"
   let str ..= "\<Home>two "
   let str ..= "\<C-Right>one "
@@ -1233,4 +1235,37 @@
   call assert_equal("\"e \<C-\>\<C-Y>", @:)
 endfunc
 
+" Test for 'imcmdline' and 'imsearch'
+" This test doesn't actually test the input method functionality.
+func Test_cmdline_inputmethod()
+  new
+  call setline(1, ['', 'abc', ''])
+  set imcmdline
+
+  call feedkeys(":\"abc\<CR>", 'xt')
+  call assert_equal("\"abc", @:)
+  call feedkeys(":\"\<C-^>abc\<C-^>\<CR>", 'xt')
+  call assert_equal("\"abc", @:)
+  call feedkeys("/abc\<CR>", 'xt')
+  call assert_equal([2, 1], [line('.'), col('.')])
+  call feedkeys("/\<C-^>abc\<C-^>\<CR>", 'xt')
+  call assert_equal([2, 1], [line('.'), col('.')])
+
+  set imsearch=2
+  call cursor(1, 1)
+  call feedkeys("/abc\<CR>", 'xt')
+  call assert_equal([2, 1], [line('.'), col('.')])
+  call cursor(1, 1)
+  call feedkeys("/\<C-^>abc\<C-^>\<CR>", 'xt')
+  call assert_equal([2, 1], [line('.'), col('.')])
+  set imdisable
+  call feedkeys("/\<C-^>abc\<C-^>\<CR>", 'xt')
+  call assert_equal([2, 1], [line('.'), col('.')])
+  set imdisable&
+  set imsearch&
+
+  set imcmdline&
+  %bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab