diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index b3d2936..c5a7d85 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -4481,6 +4481,8 @@
   call assert_equal(['Foobar', 'FooBARR'], g:compl_info.matches)
   call feedkeys("gg/FO\<tab>\<f9>", 'tx')
   call assert_equal({},  g:compl_info)
+  call feedkeys("gg/\\cFo\<tab>\<f9>", 'tx')
+  call assert_equal(['\cFoobar', '\cFooBAr', '\cFooBARR'], g:compl_info.matches)
   set ignorecase
   call feedkeys("gg/f\<tab>\<f9>", 'tx')
   call assert_equal(['foobar', 'fooBAr', 'fooBARR'], g:compl_info.matches)
@@ -4488,13 +4490,19 @@
   call assert_equal(['Foobar', 'FooBAr', 'FooBARR'], g:compl_info.matches)
   call feedkeys("gg/FO\<tab>\<f9>", 'tx')
   call assert_equal(['FOobar', 'FOoBAr', 'FOoBARR'], g:compl_info.matches)
+  call feedkeys("gg/\\Cfo\<tab>\<f9>", 'tx')
+  call assert_equal(['\CfooBAr', '\Cfoobar'], g:compl_info.matches)
   set smartcase
   call feedkeys("gg/f\<tab>\<f9>", 'tx')
-  call assert_equal(['foobar', 'fooBAr', 'fooBARR'], g:compl_info.matches)
+  call assert_equal(['foobar', 'fooBAr', 'foobarr'], g:compl_info.matches)
   call feedkeys("gg/Fo\<tab>\<f9>", 'tx')
   call assert_equal(['Foobar', 'FooBARR'], g:compl_info.matches)
   call feedkeys("gg/FO\<tab>\<f9>", 'tx')
   call assert_equal({},  g:compl_info)
+  call feedkeys("gg/\\Cfo\<tab>\<f9>", 'tx')
+  call assert_equal(['\CfooBAr', '\Cfoobar'], g:compl_info.matches)
+  call feedkeys("gg/\\cFo\<tab>\<f9>", 'tx')
+  call assert_equal(['\cFoobar', '\cFooBAr', '\cFooBARR'], g:compl_info.matches)
 
   bw!
   call test_override("char_avail", 0)