add gd_diff.py + tests for functions in it.

* gd_diff.py (read_file, get_packages): add functions.
* tests/__init__.py: add file.
* tests/files/pkgs.list: add file.
* tests/test_gd_diff.py: add file.

3 files changed, 130 insertions, 0 deletions

diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/__init__.py
diff --git a/tests/files/pkgs.list b/tests/files/pkgs.list
new file mode 100644
index 0000000..af61445
--- /dev/null
+++ b/tests/files/pkgs.list
@@ -0,0 +1,82 @@
+antlr
+apt
+apt-setup
+autoconf
+autoconf2.59
+autoconf2.64
+bacula
+base-files
+base-installer
+batik
+cairomm
+cdebootstrap
+cfitsio3
+choose-mirror
+claws-mail
+db4.6
+db4.7
+db4.8
+                          debian-cd
+debian-edu
+debian-installer
+debian-installer-launcher
+debootstrap
+desktop-base
+doc-linux
+doc-linux-hr
+doc-linux-it
+doc-linux-ja
+doc-linux-pl
+enscript                                                         
+epiphany-browser
+fop
+freetype
+galaxia
+gdm3
+glibmm2.4
+gnewsense-archive-keyring
+gnome-desktop
+gtkmm2.4
+icedove
+iceweasel
+kde4libs
+kdebase
+kdebase-workspace
+kdenetwork
+kernel-wedge
+lensfun
+liferea
+lintian
+linux-2.6
+linux-kernel-di-amd64-2.6
+linux-kernel-di-i386-2.6
+linux-latest-2.6
+live-build
+live-config
+meta-gnome2
+mplayer
+net-retriever
+objcryst-fox
+openoffice.org
+pangomm
+perl-tk
+pkgsel
+popularity-contest
+psutils
+python-apt
+screenlets
+sip4-qt3
+software-center
+tcl8.4
+tcl8.5
+texlive-extra
+tk8.4
+tk8.5
+update-manager
+vim
+wmaker
+xchat
+xdm
+xorg-server
+xserver-xorg-video-siliconmotion
+yeeloong-base
\ No newline at end of file
diff --git a/tests/test_gd_diff.py b/tests/test_gd_diff.py
new file mode 100644
index 0000000..650094f
--- /dev/null
+++ b/tests/test_gd_diff.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+#  This file is part of gns-deb-diff.
+#
+#  gns-deb-diff is under the Public Domain. See
+#  <https://creativecommons.org/publicdomain/zero/1.0>
+
+import os
+import sys
+
+from nose.tools import *
+
+from gd_diff import *
+
+class TestGdDiff(object):
+
+    def setup(self):
+        """Setup method for this class."""
+        self.pkgs_file = "tests/files/pkgs.list"
+        self.pkgs_file_ne = 'tests/nonexistent-file.list'
+
+    def test_read_file_success(self):
+        f_content = read_file(self.pkgs_file)
+
+        assert isinstance(f_content, str)
+        assert_equal(len(f_content.split('\n')), 82)
+
+    @raises(SystemExit)
+    def test_read_file_error(self):
+        with open(os.devnull, 'w') as sys.stderr:
+            f_content = read_file(self.pkgs_file_ne)
+
+
+    def test_get_packages(self):
+        pkgs_iter = get_packages(self.pkgs_file)
+        assert len(list(pkgs_iter)) == 82
+
+    def test_get_packages_sanity(self):
+        pkgs_iter = get_packages(self.pkgs_file)
+
+        for pkg in pkgs_iter:
+            assert not ' ' in pkg
+
+    def teardown(self):
+        """Teardown method for this class."""
+        pass
+