patch 8.2.0270: some code not covered by tests

Problem:    Some code not covered by tests.
Solution:   Add test cases. (Yegappan Lakshmanan, closes #5649)
diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index 1a37146..eef22d4 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -1500,6 +1500,22 @@
   bwipe!
 endfunc
 
+" Test for :startreplace and :startgreplace
+func Test_edit_startreplace()
+  new
+  call setline(1, 'abc')
+  call feedkeys("l:startreplace\<CR>xyz\e", 'xt')
+  call assert_equal('axyz', getline(1))
+  call feedkeys("0:startreplace!\<CR>abc\e", 'xt')
+  call assert_equal('axyzabc', getline(1))
+  call setline(1, "a\tb")
+  call feedkeys("0l:startgreplace\<CR>xyz\e", 'xt')
+  call assert_equal("axyz\tb", getline(1))
+  call feedkeys("0i\<C-R>=execute('startreplace')\<CR>12\e", 'xt')
+  call assert_equal("12axyz\tb", getline(1))
+  close!
+endfunc
+
 func Test_edit_noesckeys()
   CheckNotGui
   new
@@ -1519,3 +1535,5 @@
   bwipe!
   set esckeys
 endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab