### Discussed in https://github.com/apache/airflow/discussions/33345

<div type='discussions-op-text'>

<sup>Originally posted by **vuphamcs** August 11, 2023</sup>
### Description

Is there a variable similar to `prev_start_date_success` but for the previous DAG run’s completion date? The value I’m hoping to retrieve to use within the next DAG run is `2023-08-10 16:04:30`

![image](https://github.com/apache/airflow/assets/1600760/9e2af349-4c3e-47e1-8a1a-9d8827b56f57)


### Use case/motivation

One particular use case is to help guarantee that the next DAG run only queries data that was inserted during the existing DAG run, and not the past DAG run.

```python
prev_ts = context['prev_end_date_success']

sql = f"SELECT * FROM results WHERE created_at > {context['prev_end_date_success']}"
```

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
</div>
def f():
            raise Exception
        with pytest.raises(CalledProcessError):
            self.run_as_task(f)
    def test_fail_with_message(self):
        def f():
            raise Exception("Custom error message")
        with pytest.raises(AirflowException) as e:
            self.run_as_task(f)
            assert "Custom error message" in str(e)
    def test_string_args(self):
        def f():
            global virtualenv_string_args
            print(virtualenv_string_args)
            if virtualenv_string_args[0] != virtualenv_string_args[2]:
                raise Exception
        self.run_as_task(f, string_args=[1, 2, 1])
    def test_with_args(self):
        def f(a, b, c=False, d=False):
            if a == 0 and b == 1 and c and not d:
                return True
            else:
                raise Exception
        self.run_as_task(f, op_args=[0, 1], op_kwargs={"c": True})
    def test_return_none(self):
        def f():
            return None
        task = self.run_as_task(f)
        assert task.execute_callable() is None
    def test_return_false(self):