tests/template/test_templater.py

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from __future__ import annotations

import jinja2

from airflow import DAG
from airflow.template.templater import Templater
from airflow.utils.context import Context


class TestTemplater:
    def test_get_template_env(self):
        # Test get_template_env when a DAG is provided
        templater = Templater()
        dag = DAG(dag_id="test_dag", render_template_as_native_obj=True)
        env = templater.get_template_env(dag)
        assert isinstance(env, jinja2.Environment)
        assert not env.sandboxed

        # Test get_template_env when no DAG is provided
        templater = Templater()
        env = templater.get_template_env()
        assert isinstance(env, jinja2.Environment)
        assert env.sandboxed

    def test_prepare_template(self):
        # Test that prepare_template is a no-op
        templater = Templater()
        templater.prepare_template()

    def test_resolve_template_files_logs_exception(self, caplog):
        templater = Templater()
        templater.message = "template_file.txt"
        templater.template_fields = ["message"]
        templater.template_ext = [".txt"]
        templater.resolve_template_files()
        assert "Failed to resolve template field 'message'" in caplog.text

    def test_render_template(self):
        context = Context({"name": "world"})  # type: ignore
        templater = Templater()
        templater.message = "Hello {{ name }}"
        templater.template_fields = ["message"]
        templater.template_ext = [".txt"]
        rendered_content = templater.render_template(templater.message, context)
        assert rendered_content == "Hello world"