[committed][gdb/testsuite] Reimplement gdb.gdb/python-selftest.exp as unittest

[Tom de Vries via Gdb-patches <gdb-patches@sourceware.org>]

On 9/3/21 1:21 PM, Tom de Vries wrote:
> Hi,
> 
> The test-case gdb.gdb/python-selftest.exp:
> - patches the gdb_python_initialized variable in gdb to 0
> - checks that the output of a python command is "Python not initialized"
> 
> Reimplement gdb.gdb/python-selftest.exp as unittest, using:
> - execute_command_to_string to capture the output
> - try/catch to catch the "Python not initialized" exception.
> 
> Tested on x86_64-linux.
> 
> [ Passes build & gdb.gdb/unittest.exp, currently doing full regression
> test run. ]
> 
> Any comments?
> 

After the approval for the rewrite of the other test-case, this one
looks obvious.  Committed.

Thanks,
- Tom

> [gdb/testsuite] Reimplement gdb.gdb/python-selftest.exp as unittest
> 
> ---
>  gdb/python/python.c                       | 46 +++++++++++++++++++++++++++++++
>  gdb/testsuite/gdb.gdb/python-selftest.exp | 30 --------------------
>  2 files changed, 46 insertions(+), 30 deletions(-)
> 
> diff --git a/gdb/python/python.c b/gdb/python/python.c
> index e42cbc4fd5e..d1c4e272762 100644
> --- a/gdb/python/python.c
> +++ b/gdb/python/python.c
> @@ -35,6 +35,7 @@
>  #include <ctype.h>
>  #include "location.h"
>  #include "run-on-main-thread.h"
> +#include "gdbsupport/selftest.h"
>  
>  /* Declared constants and enum for python stack printing.  */
>  static const char python_excp_none[] = "none";
> @@ -1879,6 +1880,47 @@ do_start_initialization ()
>  
>  #endif /* HAVE_PYTHON */
>  
> +#if GDB_SELF_TEST
> +namespace selftests {
> +
> +/* Entry point for python unit tests.  */
> +
> +static void
> +test_python ()
> +{
> +#define CMD execute_command_to_string ("python print(5)", 0, true);
> +
> +  std::string output;
> +
> +  output = CMD;
> +  SELF_CHECK (output == "5\n");
> +  output.clear ();
> +
> +  bool saw_exception = false;
> +  scoped_restore reset_gdb_python_initialized
> +    = make_scoped_restore (&gdb_python_initialized, 0);
> +  try
> +    {
> +      output = CMD;
> +    }
> +  catch (const gdb_exception &e)
> +    {
> +      saw_exception = true;
> +      SELF_CHECK (e.reason == RETURN_ERROR);
> +      SELF_CHECK (e.error == GENERIC_ERROR);
> +      SELF_CHECK (*e.message == "Python not initialized");
> +    }
> +  SELF_CHECK (saw_exception);
> +  SELF_CHECK (output.empty ());
> +
> +#undef CMD
> +}
> +
> +#undef CHECK_OUTPUT
> +
> +} // namespace selftests
> +#endif /* GDB_SELF_TEST */
> +
>  /* See python.h.  */
>  cmd_list_element *python_cmd_element = nullptr;
>  
> @@ -1977,6 +2019,10 @@ python executable."),
>  				show_python_dont_write_bytecode,
>  				&user_set_python_list,
>  				&user_show_python_list);
> +
> +#if GDB_SELF_TEST
> +  selftests::register_test ("python", selftests::test_python);
> +#endif /* GDB_SELF_TEST */
>  }
>  
>  #ifdef HAVE_PYTHON
> diff --git a/gdb/testsuite/gdb.gdb/python-selftest.exp b/gdb/testsuite/gdb.gdb/python-selftest.exp
> deleted file mode 100644
> index 74b2c520900..00000000000
> --- a/gdb/testsuite/gdb.gdb/python-selftest.exp
> +++ /dev/null
> @@ -1,30 +0,0 @@
> -# Copyright 2013-2021 Free Software Foundation, Inc.
> -
> -# This program is free software; you can redistribute it and/or modify
> -# it under the terms of the GNU General Public License as published by
> -# the Free Software Foundation; either version 3 of the License, or
> -# (at your option) any later version.
> -#
> -# This program is distributed in the hope that it will be useful,
> -# but WITHOUT ANY WARRANTY; without even the implied warranty of
> -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> -# GNU General Public License for more details.
> -#
> -# You should have received a copy of the GNU General Public License
> -# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> -
> -load_lib selftest-support.exp
> -load_lib gdb-python.exp
> -
> -proc selftest_python {} {
> -    if {[skip_python_tests]} {
> -	return -1
> -    }
> -
> -    gdb_test_no_output "set variable gdb_python_initialized = 0"
> -    gdb_test "call catch_command_errors(execute_command, \"python print(5)\", 0, true)" \
> -	"Python not initialized.* = 0"
> -    return 0
> -}
> -
> -do_self_tests captured_command_loop selftest_python
>