Refactor TestCase files into python modules

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

tests/test_vcs.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+
+import os
+import unittest
+
+from git import Repo
+
+import fdroidserver.common
+import fdroidserver.metadata
+from .testcommon import mkdtemp
+
+
+class VCSTest(unittest.TestCase):
+    """For some reason the VCS classes are in fdroidserver/common.py"""
+
+    def setUp(self):
+        self._td = mkdtemp()
+        os.chdir(self._td.name)
+
+    def tearDown(self):
+        self._td.cleanup()
+
+    def test_remote_set_head_can_fail(self):
+        # First create an upstream repo with one commit
+        upstream_repo = Repo.init("upstream_repo")
+        with open(upstream_repo.working_dir + "/file", 'w') as f:
+            f.write("Hello World!")
+        upstream_repo.index.add([upstream_repo.working_dir + "/file"])
+        upstream_repo.index.commit("initial commit")
+        commitid = upstream_repo.head.commit.hexsha
+
+        # Now clone it once manually, like gitlab runner gitlab-runner sets up a repo during CI
+        clone1 = Repo.init("clone1")
+        clone1.create_remote("upstream", "file://" + upstream_repo.working_dir)
+        clone1.remote("upstream").fetch()
+        clone1.head.reference = clone1.commit(commitid)
+        clone1.head.reset(index=True, working_tree=True)
+        self.assertTrue(clone1.head.is_detached)
+
+        # and now we want to use this clone as a source repo for fdroid build
+        config = {}
+        os.mkdir("build")
+        config['sdk_path'] = 'MOCKPATH'
+        config['ndk_paths'] = {'r10d': os.getenv('ANDROID_NDK_HOME')}
+        config['java_paths'] = {'fake': 'fake'}
+        fdroidserver.common.config = config
+        app = fdroidserver.metadata.App()
+        app.RepoType = 'git'
+        app.Repo = clone1.working_dir
+        app.id = 'com.gpl.rpg.AndorsTrail'
+        build = fdroidserver.metadata.Build()
+        build.commit = commitid
+        build.androidupdate = ['no']
+        vcs, build_dir = fdroidserver.common.setup_vcs(app)
+        # force an init of the repo, the remote head error only occurs on the second gotorevision call
+
+        fdroidserver.common.options = type('Options', (), {'verbose': False})
+        vcs.gotorevision(build.commit)
+        fdroidserver.common.prepare_source(
+            vcs,
+            app,
+            build,
+            build_dir=build_dir,
+            srclib_dir="ignore",
+            extlib_dir="ignore",
+        )
+        self.assertTrue(os.path.isfile("build/com.gpl.rpg.AndorsTrail/file"))