Replace test case runner with a pythonic version

test

@@ -0,0 +1,28 @@
+#!/usr/bin/python
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Script to run Plinth test cases
+"""
+
+import unittest
+
+
+if __name__ == '__main__':
+    test_suite = unittest.defaultTestLoader.discover('plinth.tests')
+    unittest.TextTestRunner().run(test_suite)

test.sh

@@ -1,30 +0,0 @@
-#! /bin/sh
-
-# This file is meant to be run from the Plinth root directory:
-#
-# $ cd plinth/
-# $ ./test.sh
-
-PYTHONPATH=modules/installed/lib:$PYTHONPATH
-PYTHONPATH=vendor:$PYTHONPATH
-PYTHONPATH=.:$PYTHONPATH
-export PYTHONPATH
-
-for arg in "$@"
-do
-    if [ "$arg" = "--pause" ]
-    then
-        pause=1
-    fi
-done
-
-for file in tests/*.py
-do
-    echo "Testing ${file}:"
-    python $file
-
-    if [ "$pause" = 1 ]
-    then
-        read X
-    fi
-done