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Testing Celery Executor Deployment Configurations in Apache Airflow

This test suite validates the deployment configurations for Airflow’s Celery and CeleryKubernetes executors in a Helm chart environment. It ensures proper volume mounting and configuration settings for worker deployments across different executor types.

Test Coverage Overview

The test suite provides comprehensive coverage of worker deployment configurations in Airflow Helm charts.

Key areas tested include:

Volume configuration for Celery executor deployments
Volume configuration for CeleryKubernetes executor deployments
DAG persistence and Git sync integration
Worker deployment template validation

Implementation Analysis

The testing approach utilizes the Helm template generator to render and validate chart configurations. It employs jmespath queries to verify specific deployment specifications and volume configurations, ensuring proper template rendering for different executor types.

The implementation follows a declarative pattern, testing both standard Celery and hybrid CeleryKubernetes executor scenarios.

Technical Details

Testing tools and components include:

Helm template generator for chart rendering
JMESPath for JSON/YAML path queries
Python unit test framework
Git sync configuration validation
Volume persistence verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices in infrastructure validation.

Notable practices include:

Isolation of template rendering for specific components
Explicit verification of critical configuration parameters
Structured assertion patterns for deployment specifications
Comprehensive executor type coverage

apache/airflow

helm_tests/airflow_aux/test_celery_kubernetes_executor.py

            
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# to you under the Apache License, Version 2.0 (the
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# with the License.  You may obtain a copy of the License at
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#   http://www.apache.org/licenses/LICENSE-2.0
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations

import jmespath

from tests.charts.helm_template_generator import render_chart


class TestCeleryKubernetesExecutor:
    """Tests celery kubernetes executor."""

    def test_should_create_a_worker_deployment_with_the_celery_executor(self):
        docs = render_chart(
            values={
                "executor": "CeleryExecutor",
                "dags": {"persistence": {"enabled": True}, "gitSync": {"enabled": True}},
            },
            show_only=["templates/workers/worker-deployment.yaml"],
        )

        assert jmespath.search("spec.template.spec.volumes[0].name", docs[0]) == "config"
        assert jmespath.search("spec.template.spec.volumes[1].name", docs[0]) == "dags"

    def test_should_create_a_worker_deployment_with_the_celery_kubernetes_executor(self):
        docs = render_chart(
            values={
                "executor": "CeleryKubernetesExecutor",
                "dags": {"gitSync": {"enabled": True}, "persistence": {"enabled": False}},
            },
            show_only=["templates/workers/worker-deployment.yaml"],
        )

        assert jmespath.search("spec.template.spec.volumes[0].name", docs[0]) == "config"
        assert jmespath.search("spec.template.spec.volumes[1].name", docs[0]) == "dags"