Use a different way to get tasks count for asserting test_perf_dag

[pankajkoti]

The PR makes a change in the assert of test_perf_dag to use len(dag.tasks) which works with both AF2 and AF3 for getting the task count in the DAG. We observed that task_count attribute is unavailable on DAG object in AF3 like it's available in AF3.

closes: #1710

[Copilot]

Pull Request Overview

This PR aims to support Airflow 3 compatibility by updating test assertions and skipping tests that are currently failing or unsupported with Airflow 3. Key changes include:

• Replacing the DAG task count check with len(dag.tasks) in test_perf_dag.
• Adding skip markers and TODOs in multiple tests for Airflow 3 compatibility.
• Updating CI configurations and project metadata (pyproject.toml and GitHub workflows) to include Airflow 3.0.

Reviewed Changes

Copilot reviewed 12 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_example_k8s_dags.py	Adds skip markers for Airflow 3 compatibility.
tests/test_example_dags.py	Updates DAG file ignores and DBT version handling for AF3.
tests/test_cache.py	Skips cache tests on Airflow 3.0+.
tests/perf/test_performance.py	Changes task count assertion to len(dag.tasks).
tests/operators/test_virtualenv.py	Adjusts patching and assertions for virtualenv execution in AF3.
tests/operators/test_local.py	Introduces skip markers for various tests under AF3.
tests/operators/test_kubernetes.py	Adds skip markers for AF3 compatibility.
tests/listeners/test_dag_run_listener.py	Applies skip markers for AF3 in listener tests.
tests/dbt/parser/test_output.py	Updates imports to handle Airflow 3 conditional imports.
pyproject.toml	Adds Airflow 3.0 to the testing matrix.
dev/dags/example_tests_multiple_parents.py	Uses Path.resolve() for clearer file resolution.
.github/workflows/test.yml	Updates test workflows to include Airflow 3.0 in the matrix.

Files not reviewed (5)

• scripts/test/integration-dbt-1-5-4.sh: Language not supported
• scripts/test/integration-dbt-async.sh: Language not supported
• scripts/test/integration-setup.sh: Language not supported
• scripts/test/performance-setup.sh: Language not supported
• scripts/test/pre-install-airflow.sh: Language not supported

Comments suppressed due to low confidence (2)

tests/operators/test_virtualenv.py:112

• [nitpick] The command prefix 'uv' used in the virtualenv execution assertions is not self-explanatory; consider adding inline documentation or renaming the expected value for improved clarity.

assert virtualenv_call[0][0][0] == "uv"

tests/test_example_dags.py:91

• Review the DBT version check logic to ensure that the change does not unintentionally allow async DAGs to run on unsupported DBT versions.

if DBT_VERSION < Version("1.6.0"):

[pankajkoti]

TODO: Rebase after #1646 is merged. The branch is cut from the branch in that PR.

Main is merged back in the branch.

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[tatiana]

Looks great, thanks, @pankajkoti !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.50%. Comparing base (6762ebd) to head (4ca57c9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1714   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files          83       83           
  Lines        5049     5049           
=======================================
  Hits         4923     4923           
  Misses        126      126           

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