Add unit tests to cover the basic sbprocess helpers in safeeval and the new

`text` arg in particular. Use the `pwd` command for testing assuming that it's
portable across all sane platforms.

Author: jonasbardino

tests/test_mig_shared_safeeval.py

@@ -0,0 +1,92 @@
+# -*- coding: utf-8 -*-
+#
+# --- BEGIN_HEADER ---
+#
+# test_mig_shared_safeeval - unit test of the corresponding mig shared module
+# Copyright (C) 2003-2025  The MiG Project by the Science HPC Center at UCPH
+#
+# This file is part of MiG.
+#
+# MiG 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 2 of the License, or
+# (at your option) any later version.
+#
+# MiG 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+# USA.
+#
+# --- END_HEADER ---
+#
+
+"""Unit test safeeval functions"""
+
+import os
+import sys
+
+from tests.support import MigTestCase, testmain
+
+from mig.shared.safeeval import *
+
+
+PWD_STR = os.getcwd()
+PWD_BYTES = PWD_STR.encode('utf8')
+
+
+class MigSharedSafeeval(MigTestCase):
+    """Wrap unit tests for the corresponding module"""
+
+    def test_subprocess_call(self):
+        """Check that pwd call without args succeeds"""
+        retval = subprocess_call(['pwd'], stdout=subprocess_pipe)
+        self.assertEqual(retval, 0, "unexpected subprocess call pwd retval")
+
+    def test_subprocess_call_invalid(self):
+        """Check that pwd call with invalid arg fails"""
+        retval = subprocess_call(['pwd', '-h'], stderr=subprocess_pipe)
+        self.assertNotEqual(retval, 0,
+                            "unexpected subprocess call nosuchcommand retval")
+
+    def test_subprocess_check_output(self):
+        """Check that pwd command output matches getcwd as bytes"""
+        data = subprocess_check_output(['pwd'], stdout=subprocess_pipe,
+                                       stderr=subprocess_pipe).strip()
+        self.assertEqual(data, PWD_BYTES,
+                         "mismatch in subprocess check pwd output")
+
+    def test_subprocess_check_output_text(self):
+        """Check that pwd command output matches getcwd as string"""
+        data = subprocess_check_output(['pwd'], stdout=subprocess_pipe,
+                                       stderr=subprocess_pipe,
+                                       text=True).strip()
+        self.assertEqual(data, PWD_STR,
+                         "mismatch in subprocess check pwd output")
+
+    def test_subprocess_popen(self):
+        """Check that pwd popen output matches getcwd as bytes"""
+        proc = subprocess_popen(['pwd'], stdout=subprocess_pipe,
+                                stderr=subprocess_stdout)
+        retval = proc.wait()
+        data = proc.stdout.read().strip()
+        self.assertEqual(data, PWD_BYTES,
+                         "mismatch in subprocess popen pwd output")
+
+    def test_subprocess_popen_text(self):
+        """Check that pwd popen output matches getcwd as string"""
+        orig = os.getcwd()
+        proc = subprocess_popen(['pwd'], stdout=subprocess_pipe,
+                                stderr=subprocess_stdout, text=True)
+        retval = proc.wait()
+        data = proc.stdout.read().strip()
+        self.assertEqual(data, PWD_STR,
+                         "mismatch in subprocess popen pwd output")
+
+
+if __name__ == '__main__':
+    testmain()