wic: setup infrastructure for nosetests

cd scripts && nosetests runs 3 simple tests and
produces nice test coverage report for wic codebase.

This infra can be used to test other scripts and modules.

(From OE-Core rev: 510dadc2cd8ff8a09932c101512dba74d4624a07)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/setup.cfg

@@ -0,0 +1,6 @@
+[nosetests]
+verbosity=2
+exe=1
+with-coverage=1
+cover-erase=1
+cover-package=wic,image

scripts/tests/01_wic_test_help.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+#
+# Copyright (c) 2015, Intel Corporation.
+# All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# 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, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# AUTHORS
+# Ed Bartosh <ed.bartosh@linux.intel.com>
+
+import imp
+import unittest
+
+class TestWicHelp(unittest.TestCase):
+    """Test help output of wic (sub)commands"""
+
+    def setUp(self):
+        self.main = imp.load_source("wic", "wic").main
+
+    def testhelp(self):
+        self.assertRaises(SystemExit, self.main, ['--help'])
+
+    def testcreatehelp(self):
+        self.assertRaises(SystemExit, self.main, ['create', '--help'])
+
+    def testlisthelp(self):
+        self.assertRaises(SystemExit, self.main, ['list', '--help'])