KaiSong-UK opened a new pull request, #18290:
URL: https://github.com/apache/dolphinscheduler/pull/18290

   ## Purpose
   
   Part of #16479 [DSIP-64] - Add more workflow Integration test cases in 
master.
   
   ## Changes
   
   Added 3 new workflow graph integration test cases in  
WorkflowStartMoreGraphTestCase.java:
   
   1. **Diamond fork-join pattern** (A -> B, A -> C, B -> D, C -> D) - Classic 
fork-join where two parallel branches merge at a single downstream task.
   2. **Multi-level diamond pattern** (A -> B -> C, A -> D -> E, C -> F, E -> 
F) - Each fork branch contains two serial tasks before merging.
   3. **Four serial tasks chain** (A -> B -> C -> D) - Long serial pipeline 
with 4 linear tasks.
   
   Each test case includes corresponding YAML workflow definitions under 
dolphinscheduler-master/src/test/resources/it/start/.
   
   ## Verification
   
   - All test cases verify the workflow instance reaches `SUCCESS` state
   - All test cases assert each task instance reaches `SUCCESS` state
   - Resource cleanup is verified via 
`masterContainer.assertAllResourceReleased()`


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