patch 8.1.2143: cannot see each command even when 'verbose' is set

Problem:    Cannot see each command even when 'verbose' is set.
Solution:   List each command when 'verbose' is at least 16.
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 98768b5..55f35e7 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -1,5 +1,8 @@
 " Tests for editing the command line.
 
+source check.vim
+source screendump.vim
+
 func Test_complete_tab()
   call writefile(['testfile'], 'Xtestfile')
   call feedkeys(":e Xtest\t\r", "tx")
@@ -687,6 +690,26 @@
   call delete('Xlog')
 endfunc
 
+func Test_verbose_option()
+  CheckScreendump
+
+  let lines =<< trim [SCRIPT]
+    command DoSomething echo 'hello' |set ts=4 |let v = '123' |echo v
+    call feedkeys("\r", 't') " for the hit-enter prompt
+    set verbose=20
+  [SCRIPT]
+  call writefile(lines, 'XTest_verbose')
+
+  let buf = RunVimInTerminal('-S XTest_verbose', {'rows': 12})
+  call term_wait(buf, 100)
+  call term_sendkeys(buf, ":DoSomething\<CR>")
+  call VerifyScreenDump(buf, 'Test_verbose_option_1', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('XTest_verbose')
+endfunc
+
 func Test_setcmdpos()
   func InsertTextAtPos(text, pos)
     call assert_equal(0, setcmdpos(a:pos))