Add tests for airflow dags

Makefile

+include Makefile.conda
+
 branch := $(shell git rev-parse --abbrev-ref HEAD)
 short_commit_hash := $(shell git rev-parse --short=8 HEAD)
 airflow_host := an-airflow1003.eqiad.wmnet
@@ -25,6 +27,11 @@ ima-venv:
 	rm -f ${ima_home}/${ima_venv_archive}
 	make -C ${ima_home} venv
 
+test_dags: ${pip_requirements_test}
+	${DOCKER_CMD} bash -c "export CONDA_ALWAYS_YES=true; ${CONDA_CMD}; \
+		pip install -r ${pip_requirements_test}; \
+		python -m pytest tests/"
+
 test:
 	cd  ${ima_home}; make test
 

Makefile.conda

+SHELL := /bin/bash
+
+venv := venv
+venv_archive_format := tar.gz
+pip_requirements := requirements.txt
+pip_requirements_test := requirements-test.txt
+conda_python_version = 3.7
+pyspark_version = 2.4.5
+extra_pypi := https://gitlab.wikimedia.org/api/v4/projects/40/packages/pypi/simple
+
+CONDA_CMD := conda config --set pip_interop_enabled True; conda create -n ${venv} python=${conda_python_version}; conda init bash; source ~/.bashrc && conda activate ${venv}
+
+ifneq ($(SKIP_DOCKER),true)
+    CURRENT_DIR := $(shell pwd)
+	DOCKER_IMG := continuumio/miniconda3
+	DOCKER_CMD := docker run -it \
+		--rm \
+		-v ${CURRENT_DIR}:/root \
+		-e SKIP_DOCKER=true \
+		-w /root ${DOCKER_IMG}
+endif
+
+venv:	${pip_requirements}
+	${DOCKER_CMD} bash -c "export CONDA_ALWAYS_YES=true; ${CONDA_CMD}; \
+							pip install --extra-index-url ${extra_pypi} -r ${pip_requirements}; \
+							conda deactivate; \
+							conda install conda-pack; \
+							conda-pack -n ${venv} --format ${venv_archive_format}"
+
+test:   ${pip_requirements_test}
+	${DOCKER_CMD} bash -c "export CONDA_ALWAYS_YES=true; ${CONDA_CMD}; \
+					pip install -r ${pip_requirements_test}; \
+					python -m pytest tests/"
+

image-matching/Makefile

 SHELL := /bin/bash
 
-venv := venv
-venv_archive_format := tar.gz
-pip_requirements := requirements.txt
-pip_requirements_test := requirements-test.txt
-conda_python_version = 3.7
-pyspark_version = 2.4.5
-extra_pypi := https://gitlab.wikimedia.org/api/v4/projects/40/packages/pypi/simple
-
-CONDA_CMD := conda config --set pip_interop_enabled True; conda create -n ${venv} python=${conda_python_version}; conda init bash; source ~/.bashrc && conda activate ${venv}
-
-ifneq ($(SKIP_DOCKER),true)
-	DOCKER_IMG := continuumio/miniconda3
-	DOCKER_CMD := docker run -it \
-		--rm \
-		-v /Users/gmodena/repos/gitlab/platform-airflow-dags/image-matching:/root \
-		-e SKIP_DOCKER=true \
-		-w /root ${DOCKER_IMG}
-endif
-
-venv:	${pip_requirements}
-	${DOCKER_CMD} bash -c "export CONDA_ALWAYS_YES=true; ${CONDA_CMD}; \
-							pip install --extra-index-url ${extra_pypi} -r ${pip_requirements}; \
-							conda deactivate; \
-							conda install conda-pack; \
-							conda-pack -n ${venv} --format ${venv_archive_format}"
+include ../Makefile.conda
 
 test:   ${pip_requirements_test}
 	${DOCKER_CMD} bash -c "export CONDA_ALWAYS_YES=true; ${CONDA_CMD}; \

requirements-test.txt

+pytest==6.2.5
+apache-airflow==2.2.0
+apache-airflow-providers-papermill==2.1.0

tests/dags/test_dag_integrity.py

+"""
+Modified from
+https://github.com/danielvdende/data-testing-with-airflow/blob/master/integrity_tests/test_dag_integrity.py.
+Testing Airflow workflows - ensuring your DAGs work before going into production, https://www.youtube.com/watch?v=ANJnYbLwLjE&t=1184s
+
+DAG integrity test for airflow.
+"""
+import glob
+import importlib.util
+from os import path
+
+import pytest
+from airflow import models as airflow_models
+from airflow.utils.dag_cycle_tester import check_cycle
+
+DAGS_PATH = glob.glob(path.join(path.dirname(__file__), '..', '..', 'dags', '*.py'))
+
+
+def _exec_module(name: str, location: str):
+    spec = importlib.util.spec_from_file_location(name, location)
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+
+    return module
+
+
+@pytest.mark.parametrize('dag_path', DAGS_PATH)
+def test_dag_integrity(dag_path):
+    dag_name = path.basename(dag_path)
+    module = _exec_module(dag_name, str(dag_path))
+    dag_objects = [var for var in vars(module).values() if isinstance(var, airflow_models.DAG)]
+    assert dag_objects
+
+    # Ensure  that all dags are acyclic
+    for dag in dag_objects:
+        check_cycle(dag)
+