Refactor TestCase files into python modules

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

tests/test_init.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import os
+import pathlib
+import shutil
+import sys
+import unittest
+
+import fdroidserver.common
+import fdroidserver.init
+from . import testcommon
+
+basedir = pathlib.Path(__file__).parent
+
+
+class InitTest(unittest.TestCase):
+    '''fdroidserver/init.py'''
+
+    def setUp(self):
+        fdroidserver.common.config = None
+        fdroidserver.init.config = None
+        self._td = testcommon.mkdtemp()
+        self.testdir = self._td.name
+        os.chdir(self.testdir)
+
+    def tearDown(self):
+        os.chdir(basedir)
+        self._td.cleanup()
+
+    def test_disable_in_config(self):
+        configfile = pathlib.Path('config.yml')
+        configfile.write_text('keystore: NONE\nkeypass: mysupersecrets\n')
+        configfile.chmod(0o600)
+        config = fdroidserver.common.read_config()
+        self.assertEqual('NONE', config['keystore'])
+        self.assertEqual('mysupersecrets', config['keypass'])
+        fdroidserver.init.disable_in_config('keypass', 'comment')
+        self.assertIn('#keypass:', configfile.read_text())
+        fdroidserver.common.config = None
+        config = fdroidserver.common.read_config()
+        self.assertIsNone(config.get('keypass'))
+
+    @unittest.skipIf(os.name == 'nt', "calling main() like this hangs on Windows")
+    def test_main_in_empty_dir(self):
+        """Test that `fdroid init` will find apksigner and add it to the config"""
+
+        shutil.copy(basedir / 'keystore.jks', self.testdir)
+
+        bindir = os.path.join(os.getcwd(), 'bin')
+        os.mkdir(bindir)
+        apksigner = os.path.join(bindir, 'apksigner')
+        open(apksigner, 'w').close()
+        os.chmod(apksigner, 0o755)  # nosec B103
+
+        sys.argv = ['fdroid init', '--keystore', 'keystore.jks', '--repo-keyalias=sova']
+        with unittest.mock.patch.dict(os.environ, {'PATH': bindir}):
+            fdroidserver.init.main()
+        self.assertEqual(apksigner, fdroidserver.init.config.get('apksigner'))