diff --git a/cosmos/operators/virtualenv.py b/cosmos/operators/virtualenv.py
index babc431b8..5036064f2 100644
--- a/cosmos/operators/virtualenv.py
+++ b/cosmos/operators/virtualenv.py
@@ -125,7 +125,7 @@ def _get_or_create_venv_py_interpreter(self) -> str:
             )
 
         self.log.info(f"Checking if {str(self.__lock_file)} exists")
-        while not self.__is_lock_available():
+        while not self._is_lock_available():
             self.log.info("Waiting for lock to release")
             time.sleep(1)
 
@@ -154,7 +154,7 @@ def _pid(self) -> int:
         return os.getpid()
     
     @depends_on_virtualenv_dir
-    def __is_lock_available(self) -> bool:
+    def _is_lock_available(self) -> bool:
         if self.__lock_file.is_file():
             with open(self.__lock_file, "r") as lf:
                 pid = int(lf.read())
diff --git a/tests/operators/test_virtualenv.py b/tests/operators/test_virtualenv.py
index e13228f57..3997fa75e 100644
--- a/tests/operators/test_virtualenv.py
+++ b/tests/operators/test_virtualenv.py
@@ -72,15 +72,18 @@ def test_run_command(
 @patch("cosmos.operators.virtualenv.DbtLocalBaseOperator.store_compiled_sql")
 @patch("cosmos.operators.virtualenv.DbtLocalBaseOperator.exception_handling")
 @patch("cosmos.operators.virtualenv.DbtLocalBaseOperator.subprocess_hook")
+@patch("cosmos.operators.virtualenv.DbtVirtualenvBaseOperator._is_lock_available")
 @patch("airflow.hooks.base.BaseHook.get_connection")
 def test_supply_virtualenv_dir_flag(
     mock_get_connection,
+    mock_lock_available,
     mock_subprocess_hook,
     mock_exception_handling,
     mock_store_compiled_sql,
     mock_calculate_openlineage_events_completes,
     mock_execute,
 ):
+    mock_lock_available.return_value = True
     mock_get_connection.return_value = Connection(
         conn_id="fake_conn",
         conn_type="postgres",
diff --git a/tests/test_converter.py b/tests/test_converter.py
index 23423b912..3b409256f 100644
--- a/tests/test_converter.py
+++ b/tests/test_converter.py
@@ -114,12 +114,14 @@ def test_converter_creates_dag_with_project_path_str(mock_load_dbt_graph, execut
         # (ExecutionMode.DOCKER, {"image": "sample-image"}),
     ],
 )
+@patch("cosmos.converter.DbtGraph.filtered_nodes", nodes)
+@patch("cosmos.converter.DbtGraph.load")
 def test_converter_raises_warning(mock_load_dbt_graph, execution_mode, virtualenv_dir, operator_args, caplog):
     """
     This test will raise a warning if we are trying to pass ExecutionMode != `VirtualEnv`
     and still pass a defined `virtualenv_dir`
     """
-    project_config = ProjectConfig(dbt_project_path=SAMPLE_DBT_PROJECT)
+    project_config = ProjectConfig(dbt_project_path=SAMPLE_DBT_PROJECT.as_posix())
     execution_config = ExecutionConfig(execution_mode=execution_mode, virtualenv_dir=virtualenv_dir)
     render_config = RenderConfig(emit_datasets=True)
     profile_config = ProfileConfig(
@@ -137,8 +139,6 @@ def test_converter_raises_warning(mock_load_dbt_graph, execution_mode, virtualen
         operator_args=operator_args,
     )
 
-    assert converter
-
     assert "`ExecutionConfig.virtualenv_dir` is only supported when \
                 ExecutionConfig.execution_mode is set to ExecutionMode.VIRTUALENV." in caplog.text