test_context_processing() — flask Function Reference

Architecture documentation for the test_context_processing() function in test_blueprints.py from the flask codebase.

Function python ApplicationCore AppLifeCycle

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ApplicationCore→ AppLifeCycle→ test_context_processing() — flask Function Reference

Dependency Diagram

graph TD
  6408bdf7_49fd_4391_3434_19a0dbe5dbfb["test_context_processing()"]
  4366a441_d387_52f9_ec8d_1c41c71c00a8["test_blueprints.py"]
  6408bdf7_49fd_4391_3434_19a0dbe5dbfb -->|defined in| 4366a441_d387_52f9_ec8d_1c41c71c00a8
  style 6408bdf7_49fd_4391_3434_19a0dbe5dbfb fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

tests/test_blueprints.py lines 682–720

def test_context_processing(app, client):
    answer_bp = flask.Blueprint("answer_bp", __name__)

    def template_string():
        return flask.render_template_string(
            "{% if notanswer %}{{ notanswer }} is not the answer. {% endif %}"
            "{% if answer %}{{ answer }} is the answer.{% endif %}"
        )

    # App global context processor
    @answer_bp.app_context_processor
    def not_answer_context_processor():
        return {"notanswer": 43}

    # Blueprint local context processor
    @answer_bp.context_processor
    def answer_context_processor():
        return {"answer": 42}

    # Setup endpoints for testing
    @answer_bp.route("/bp")
    def bp_page():
        return template_string()

    @app.route("/")
    def app_page():
        return template_string()

    # Register the blueprint
    app.register_blueprint(answer_bp)

    app_page_bytes = client.get("/").data
    answer_page_bytes = client.get("/bp").data

    assert b"43" in app_page_bytes
    assert b"42" not in app_page_bytes

    assert b"42" in answer_page_bytes
    assert b"43" in answer_page_bytes