Implement basic test for infrastructure api

src/main/python/ddadevops/release-mixin/test/test_infrastructure_api.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+import pytest as pt
 import sys
 import os
 
@@ -17,4 +18,25 @@ sys.path.append(parent)
 # now we can import the module in the parent
 # directory.
 
-from infrastructure_api import GitApi # todo: implement from services example
+from infrastructure_api import GitApi 
+
+def change_test_dir( tmp_path: Path, monkeypatch: pt.MonkeyPatch):
+    monkeypatch.chdir(tmp_path)
+
+def test_git_api(tmp_path: Path, monkeypatch: pt.MonkeyPatch):
+    # init
+    file_name = 'config.json'
+    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")
+
+    # test   
+    latest_commit = git_api.get_latest_commit()
+    assert "MINOR release" in latest_commit