Fix service test and cleanup services

We now create a temporary git repository that creates a release commit.
Remove whitespaces, unused imports.

services.py

@@ -16,11 +16,10 @@ class PrepareReleaseService():
         self.git_api.commit(commit_message)
 
     def write_and_commit_release(self):
-        self.__write_and_commit_version(self.release.release_version(), commit_message=f'Release {self.release.release_version().get_version_string()}')
+        self.__write_and_commit_version(self.release.release_version(), commit_message=f'Release v{self.release.release_version().get_version_string()}')
 
     def write_and_commit_bump(self):
-        self.__write_and_commit_version(self.release.bump_version(), commit_message=f'Version bump')
-    
+        self.__write_and_commit_version(self.release.bump_version(), commit_message='Version bump')
 
 class TagAndPushReleaseService():
 
@@ -32,5 +31,3 @@ class TagAndPushReleaseService():
         message = 'Release ' + annotation
         self.git_api.tag_annotated(annotation, message, 1)
         # self.git_api.push()
-    
-

test/test_services.py

@@ -1,3 +1,4 @@
+import pytest as pt
 from pathlib import Path
 import sys
 import os
@@ -17,26 +18,38 @@ sys.path.append(parent)
 # now we can import the module in the parent
 # directory.
 
-from services import InitReleaseService
+from services import PrepareReleaseService
 from domain import ReleaseType
 from infrastructure import VersionRepository, ReleaseRepository, ReleaseTypeRepository
 from infrastructure_api import GitApi
 
-def test_init_release_service(tmp_path):
+def change_test_dir( tmp_path: Path, monkeypatch: pt.MonkeyPatch):
+    monkeypatch.chdir(tmp_path)
+
+def test_prepare_release_service(tmp_path: Path, monkeypatch: pt.MonkeyPatch):
     # init
     file_name = 'config.json'
-    with open(f'test/resources/{file_name}', 'r') as gradle_file:
-        contents = gradle_file.read()
-
+    with open(f'test/resources/{file_name}', 'r') as json_file:
+        contents = json_file.read()
     f = tmp_path / file_name
     f.write_text(contents)
+    change_test_dir(tmp_path, monkeypatch) # change the context of the script execution to tmp_path
+
+    git_api = GitApi()
+    git_api.init()
+    git_api.add_file(file_name)
+    git_api.commit("MINOR release")
 
     repo = ReleaseRepository(VersionRepository(f), ReleaseTypeRepository(GitApi()), 'main')
-    release_service = InitReleaseService(repo)
-    version = release_service.get_version().create_release_version(ReleaseType.MINOR)
+    prepare_release_service = PrepareReleaseService(repo)
+    prepare_release_service.main_branch = "main"
+    prepare_release_service.write_and_commit_release()
+
+    latest_commit = git_api.get_latest_commit()
 
-    assert "123.124.0" in version.get_version_string()
+    assert '"Release v123.124.0 "\n' in latest_commit
 
-    version = version.create_bump_version()
+    prepare_release_service.write_and_commit_bump()
+    latest_commit = git_api.get_latest_commit()
 
-    assert "123.124.1-SNAPSHOT" in version.get_version_string()
+    assert '"Version bump "\n' in latest_commit