human
Give me a the Python program you requested given the following:
Complete the below
@pytest.fixture(scope='module')
def database(tmpdir_factory, builtin_mock, config):

    ''''Creates a mock database with some packages installed note that
    the ref count for dyninst here will be 3, as it\'s recycled
    across each install.'
    '''
assistant
#Here is the Python program you requested.
    install_path = tmpdir_factory.mktemp('install_for_database')
    spack_install_path = py.path.local(spack.store.root)
    spack.store.root = str(install_path)
    install_layout = spack.directory_layout.YamlDirectoryLayout(str(install_path))
    spack_install_layout = spack.store.layout
    spack.store.layout = install_layout
    install_db = spack.database.Database(str(install_path))
    spack_install_db = spack.store.db
    spack.store.db = install_db
    Entry = collections.namedtuple('Entry', ['path', 'layout', 'db'])
    Database = collections.namedtuple('Database', ['real', 'mock', 'install', 'uninstall', 'refresh'])
    real = Entry(path=spack_install_path, layout=spack_install_layout, db=spack_install_db)
    mock = Entry(path=install_path, layout=install_layout, db=install_db)
    def _install(spec):
        s = spack.spec.Spec(spec)
        s.concretize()
        pkg = spack.repo.get(s)
        pkg.do_install(fake=True)
    def _uninstall(spec):
        spec.package.do_uninstall(spec)
    def _refresh():
        with spack.store.db.write_transaction():
            for spec in spack.store.db.query():
                _uninstall(spec)
            _install('mpileaks    ^mpich')
            _install('mpileaks    ^mpich2')
            _install('mpileaks    ^zmpi')
            _install('externaltest')
    t = Database(real=real, mock=mock, install=_install, uninstall=_uninstall, refresh=_refresh)
    with spack.store.db.write_transaction():
        t.install('mpileaks    ^mpich')
        t.install('mpileaks    ^mpich2')
        t.install('mpileaks    ^zmpi')
        t.install('externaltest')
    (yield t)
    with spack.store.db.write_transaction():
        for spec in spack.store.db.query():
            t.uninstall(spec)
    install_path.remove(rec=1)
    spack.store.root = str(spack_install_path)
    spack.store.layout = spack_install_layout
    spack.store.db = spack_install_db