add tests for root_dir

tests/test_mpsd_software.py

@@ -539,6 +539,28 @@ def test_initialize_environment(tmp_path):
     assert pytest_wrapped_e.value.code == 1
 
 
+def test_get_root_dir(tmp_path):
+    """Test that the root directory is correct."""
+    with mod.os_chdir(tmp_path):
+        # test that  function exists with error 1 if root dir doesn't exist
+        with pytest.raises(SystemExit) as pytest_wrapped_e:
+            mod.get_root_dir()
+        assert pytest_wrapped_e.type == SystemExit
+        assert pytest_wrapped_e.value.code == 1
+
+        # test that initialize_environment creates the root dir
+        mod.initialize_environment(tmp_path)
+        root_dir = mod.get_root_dir()
+        assert root_dir == tmp_path
+
+        # test that root_dir from paret is detected correctly
+        sub_dir = tmp_path / "sub_dir"
+        sub_dir.mkdir()
+        with mod.os_chdir(sub_dir):
+            root_dir = mod.get_root_dir()
+            assert root_dir == tmp_path
+
+
 def test_interface(tmp_path):
     """Test other things (not implemented yet)."""
     pass