tests/test_db.py


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import sqlite3

import pytest
from flaskr.db import get_db


def test_get_close_db(app):
    with app.app_context():
        db = get_db()
        assert db is get_db()

    with pytest.raises(sqlite3.ProgrammingError) as e:
        db.execute('SELECT 1')

    assert 'closed' in str(e.value)


def test_init_db_command(runner, monkeypatch):
    """
    This test uses Pytest’s monkeypatch fixture to replace the init_db
    function with one that records that it’s been called. The runner fixture you
    wrote above is used to call the init-db command by name.
    """
    class Recorder(object):
        called = False

    def fake_init_db():
        Recorder.called = True

    monkeypatch.setattr('flaskr.db.init_db', fake_init_db)
    result = runner.invoke(args=['init-db'])
    assert 'Initialized' in result.output
    assert Recorder.called