How to use the puppetboard.app.app.test_request_context function in puppetboard

def test_error_server(mock_puppetdb_environments):
    with app.app.test_request_context():
        (output, error_code) = server_error(None)
        soup = BeautifulSoup(output, 'html.parser')

        assert 'Internal Server Error' in soup.h2.text
        assert error_code == 500

def test_early_error_server(mock_server_error):
    with app.app.test_request_context():
        (output, error_code) = server_error(None)
        soup = BeautifulSoup(output, 'html.parser')
        assert 'Internal Server Error' in soup.h2.text
        assert error_code == 500

def test_error_precond(mock_puppetdb_environments):
    with app.app.test_request_context():
        (output, error_code) = precond_failed(None)
        soup = BeautifulSoup(output, 'html.parser')

        long_string = "%s %s" % ('You\'ve configured Puppetboard with an API',
                                 'version that does not support this feature.')
        assert long_string in soup.p.text
        assert error_code == 412

def test_error_bad_request(mock_puppetdb_environments):
    with app.app.test_request_context():
        (output, error_code) = bad_request(None)
        soup = BeautifulSoup(output, 'html.parser')

        assert 'The request sent to PuppetDB was invalid' in soup.p.text
        assert error_code == 400

def test_error_not_found(mock_puppetdb_environments):
    with app.app.test_request_context():
        (output, error_code) = not_found(None)
        soup = BeautifulSoup(output, 'html.parser')

        long_string = "%s %s" % ('What you were looking for could not',
                                 'be found in PuppetDB.')
        assert long_string in soup.p.text
        assert error_code == 404