seanghaeli opened a new pull request, #68871:
URL: https://github.com/apache/airflow/pull/68871
`test_try_adopt_task_instances` is currently **red on main** across the
provider test jobs (Non-DB / LowestDeps / LatestBoto / Pendulum2 for `amazon`):
```
airflow-core/src/airflow/executors/workloads/task.py:103: in make
ser_ti = TaskInstanceDTO.model_validate(ti, from_attributes=True)
pydantic_core.ValidationError: 1 validation error for TaskInstanceDTO
hostname
Input should be a valid string, input_value=<Mock name='mock.hostname'>,
input_type=Mock
```
#68027 routes orphaned-task adoption through
`TaskInstanceDTO.model_validate(...)`, and `TaskInstanceDTO` inherits a
required `hostname: str` from the SDK `TaskInstance`. The test builds
`mock.Mock(spec=TaskInstance)` orphaned tasks and sets ~18 attributes but never
`.hostname`, so validation receives a `Mock` and raises a `string_type` error.
Fix: set `task.hostname` on the orphaned-task mocks so the DTO validates.
**Verified locally** (breeze, py3.10): `test_try_adopt_task_instances` now
passes (`1 passed`); previously failed with the ValidationError above.
related: #68027
---
##### Was generative AI tooling used to co-author this PR?
- [x] Yes — Claude Code (Opus 4.8)
Generated-by: Claude Code (Opus 4.8) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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