patch 9.1.1254: need more tests for the comment plugin

Problem:  need more tests for the comment plugin
Solution: add a tests for the [gb]:comment_first_col setting
          (Maxim Kim)

closes: #16995

Signed-off-by: Maxim Kim <habamax@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_plugin_comment.vim

@@ -1,3 +1,5 @@
+" Test for the comment package
+
 source check.vim
 source term_util.vim
 
@@ -105,7 +107,6 @@ func Test_bothends_uncomment()
   call assert_equal(["int main() {", "  return 0;", "}"], result)
 endfunc
 
-
 func Test_mixed_comment()
   CheckScreendump
   let lines =<< trim END
@@ -177,6 +178,56 @@ func Test_mixed_indent_comment()
   call assert_equal(["/* int main() { */", "\t/* if 1 { */", "\t  /* return 0; */",  "\t/* } */", "    /* return 1; */", "/* } */"], result)
 endfunc
 
+func Test_buffer_first_col_comment()
+  CheckScreendump
+  let lines =<< trim END
+    def Hello():
+      print("Hello")
+      pass
+  END
+
+  let input_file = "test_first_col_comment_input.py"
+  call writefile(lines, input_file, "D")
+
+  let buf = RunVimInTerminal('-c "packadd comment" -c "let b:comment_first_col=1" ' .. input_file, {})
+
+  call term_sendkeys(buf, "jgcc")
+  let output_file = "comment_first_col_test.py"
+  call term_sendkeys(buf, $":w {output_file}\<CR>")
+  defer delete(output_file)
+
+  call StopVimInTerminal(buf)
+
+  let result = readfile(output_file)
+
+  call assert_equal(["def Hello():", '#   print("Hello")', "  pass"], result)
+endfunc
+
+func Test_global_first_col_comment()
+  CheckScreendump
+  let lines =<< trim END
+    def Hello():
+      print("Hello")
+      pass
+  END
+
+  let input_file = "test_first_col_comment_input.py"
+  call writefile(lines, input_file, "D")
+
+  let buf = RunVimInTerminal('-c "packadd comment" -c "let g:comment_first_col=1" ' .. input_file, {})
+
+  call term_sendkeys(buf, "jgcj")
+  let output_file = "comment_first_col_test.py"
+  call term_sendkeys(buf, $":w {output_file}\<CR>")
+  defer delete(output_file)
+
+  call StopVimInTerminal(buf)
+
+  let result = readfile(output_file)
+
+  call assert_equal(["def Hello():", '#   print("Hello")', "#   pass"], result)
+endfunc
+
 func Test_textobj_icomment()
   CheckScreendump
   let lines =<< trim END

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1254,
 /**/
     1253,
 /**/