Refactor TestCase files into python modules

Convert all TestCase files into standard python modules to be run and
discovered by unittest.

tests/test_gpgsign.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+
+import json
+import os
+import shutil
+import tempfile
+import unittest
+
+from fdroidserver import common, gpgsign
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+basedir = Path(__file__).parent
+
+
+class GpgsignTest(unittest.TestCase):
+    def setUp(self):
+        self.tempdir = tempfile.TemporaryDirectory()
+        os.chdir(self.tempdir.name)
+        self.repodir = Path('repo')
+        self.repodir.mkdir()
+
+        gpgsign.config = None
+        config = common.read_config()
+        config['verbose'] = True
+        config['gpghome'] = str((basedir / 'gnupghome').resolve())
+        config['gpgkey'] = '1DBA2E89'
+        gpgsign.config = config
+
+    def tearDown(self):
+        self.tempdir.cleanup()
+
+    @patch('sys.argv', ['fdroid gpgsign', '--verbose'])
+    @patch('fdroidserver.gpgsign.FDroidPopen')
+    def test_sign_index(self, FDroidPopen):
+        """This skips running gpg because its hard to setup in a test env"""
+        index_v1_json = 'repo/index-v1.json'
+        shutil.copy(basedir / index_v1_json, 'repo')
+        shutil.copy(basedir / 'SpeedoMeterApp.main_1.apk', 'repo')
+
+        def _side_effect(gpg):
+            f = gpg[-1]
+            sig = gpg[3]
+            self.assertTrue(sig.startswith(f))
+            open(sig, 'w').close()
+            p = MagicMock()
+            p.returncode = 0
+            return p
+
+        FDroidPopen.side_effect = _side_effect
+        gpgsign.main()
+        self.assertTrue(FDroidPopen.called)
+        self.assertTrue((self.repodir / 'index-v1.json').exists())
+        self.assertTrue((self.repodir / 'index-v1.json.asc').exists())
+        self.assertTrue((self.repodir / 'SpeedoMeterApp.main_1.apk.asc').exists())
+        self.assertFalse((self.repodir / 'index.jar.asc').exists())
+        # smoke check status JSON
+        with (self.repodir / 'status/gpgsign.json').open() as fp:
+            data = json.load(fp)
+        self.assertIn('index-v1.json', data['signed'])