notifications-api/tests/app/v2/notifications/test_post_letter_notifications.py

import uuid
from unittest.mock import ANY

import pytest
from flask import json, url_for

from app.config import QueueNames
from app.models import (
    EMAIL_TYPE,
    INTERNATIONAL_LETTERS,
    KEY_TYPE_NORMAL,
    KEY_TYPE_TEAM,
    KEY_TYPE_TEST,
    LETTER_TYPE,
    NOTIFICATION_CREATED,
    NOTIFICATION_DELIVERED,
    NOTIFICATION_PENDING_VIRUS_CHECK,
    NOTIFICATION_SENDING,
    SMS_TYPE,
    Job,
    Notification,
)
from app.notifications.process_letter_notifications import (
    create_letter_notification,
)
from app.schema_validation import validate
from app.v2.errors import RateLimitError
from app.v2.notifications.notification_schemas import post_letter_response
from tests import create_service_authorization_header
from tests.app.db import create_letter_contact, create_service, create_template
from tests.conftest import set_config_values

test_address = {
    'address_line_1': 'test 1',
    'address_line_2': 'test 2',
    'postcode': 'test pc'
}


def letter_request(client, data, service_id, key_type=KEY_TYPE_NORMAL, _expected_status=201, precompiled=False):
    if precompiled:
        url = url_for('v2_notifications.post_precompiled_letter_notification')
    else:
        url = url_for('v2_notifications.post_notification', notification_type=LETTER_TYPE)
    resp = client.post(
        url,
        data=json.dumps(data),
        headers=[
            ('Content-Type', 'application/json'),
            create_service_authorization_header(service_id=service_id, key_type=key_type)
        ]
    )
    json_resp = json.loads(resp.get_data(as_text=True))
    assert resp.status_code == _expected_status, json_resp
    return json_resp


@pytest.mark.parametrize('reference', [None, 'reference_from_client'])
def test_post_letter_notification_returns_201(client, sample_letter_template, mocker, reference):
    mock = mocker.patch('app.celery.tasks.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': 'SW1 1AA',
            'name': 'Lizzie'
        }
    }

    if reference:
        data.update({'reference': reference})

    resp_json = letter_request(client, data, service_id=sample_letter_template.service_id)

    assert validate(resp_json, post_letter_response) == resp_json
    assert Job.query.count() == 0
    notification = Notification.query.one()
    assert notification.status == NOTIFICATION_CREATED
    assert resp_json['id'] == str(notification.id)
    assert resp_json['reference'] == reference
    assert resp_json['content']['subject'] == sample_letter_template.subject
    assert resp_json['content']['body'] == sample_letter_template.content
    assert 'v2/notifications/{}'.format(notification.id) in resp_json['uri']
    assert resp_json['template']['id'] == str(sample_letter_template.id)
    assert resp_json['template']['version'] == sample_letter_template.version
    assert (
        'services/{}/templates/{}'.format(
            sample_letter_template.service_id,
            sample_letter_template.id
        ) in resp_json['template']['uri']
    )
    assert not resp_json['scheduled_for']
    assert not notification.reply_to_text
    mock.assert_called_once_with([str(notification.id)], queue=QueueNames.CREATE_LETTERS_PDF)


def test_post_letter_notification_sets_postage(
    client, notify_db_session, mocker
):
    service = create_service(service_permissions=[LETTER_TYPE])
    template = create_template(service, template_type="letter", postage="first")
    mocker.patch('app.celery.tasks.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(template.id),
        'personalisation': {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': 'SW1 1AA',
            'name': 'Lizzie'
        }
    }

    resp_json = letter_request(client, data, service_id=service.id)

    assert validate(resp_json, post_letter_response) == resp_json
    notification = Notification.query.one()
    assert notification.postage == "first"


def test_post_letter_notification_formats_postcode(
    client, notify_db_session, mocker
):
    service = create_service(service_permissions=[LETTER_TYPE])
    template = create_template(service, template_type="letter")
    mocker.patch('app.celery.tasks.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(template.id),
        'personalisation': {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': '  Sw1  1aa   ',
            'name': 'Lizzie'
        }
    }

    resp_json = letter_request(client, data, service_id=service.id)

    assert validate(resp_json, post_letter_response) == resp_json
    notification = Notification.query.one()
    # We store what the client gives us, and only reformat it when
    # generating the PDF
    assert notification.personalisation["postcode"] == '  Sw1  1aa   '


def test_post_letter_notification_stores_country(
    client, notify_db_session, mocker
):
    service = create_service(service_permissions=[LETTER_TYPE, INTERNATIONAL_LETTERS])
    template = create_template(service, template_type="letter")
    mocker.patch('app.celery.tasks.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(template.id),
        'personalisation': {
            'address_line_1': 'Kaiser Wilhelm II',
            'address_line_2': 'Kronprinzenpalais',
            'address_line_5': '   deutschland   ',
        }
    }

    resp_json = letter_request(client, data, service_id=service.id)

    assert validate(resp_json, post_letter_response) == resp_json
    notification = Notification.query.one()
    # In the personalisation we store what the client gives us
    assert notification.personalisation["address_line_1"] == 'Kaiser Wilhelm II'
    assert notification.personalisation["address_line_2"] == 'Kronprinzenpalais'
    assert notification.personalisation["address_line_5"] == '   deutschland   '
    # In the to field we store the whole address with the canonical country
    assert notification.to == (
        'Kaiser Wilhelm II\n'
        'Kronprinzenpalais\n'
        'Germany'
    )
    assert notification.postage == 'europe'
    assert notification.international


def test_post_letter_notification_international_sets_rest_of_world(
    client, notify_db_session, mocker
):
    service = create_service(service_permissions=[LETTER_TYPE, INTERNATIONAL_LETTERS])
    template = create_template(service, template_type="letter")
    mocker.patch('app.celery.tasks.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(template.id),
        'personalisation': {
            'address_line_1': 'Prince Harry',
            'address_line_2': 'Toronto',
            'address_line_5': 'Canada',
        }
    }

    resp_json = letter_request(client, data, service_id=service.id)

    assert validate(resp_json, post_letter_response) == resp_json
    notification = Notification.query.one()

    assert notification.postage == 'rest-of-world'


@pytest.mark.parametrize('permissions, personalisation, expected_error', (
    (
        [LETTER_TYPE],
        {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': 'not a real postcode',
            'name': 'Lizzie'
        },
        'Must be a real UK postcode',
    ),
    (
        [LETTER_TYPE],
        {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': ']Buckingham Palace',
            'postcode': 'SW1A 1AA',
            'name': 'Lizzie'
        },
        'Address lines must not start with any of the following characters: @ ( ) = [ ] ” \\ / , < >',
    ),
    (
        [LETTER_TYPE, INTERNATIONAL_LETTERS],
        {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': 'not a real postcode',
            'name': 'Lizzie'
        },
        'Last line of address must be a real UK postcode or another country',
    ),
))
def test_post_letter_notification_throws_error_for_bad_address(
    client, notify_db_session, mocker, permissions, personalisation, expected_error
):
    service = create_service(service_permissions=permissions)
    template = create_template(service, template_type="letter", postage="first")
    mocker.patch('app.celery.tasks.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(template.id),
        'personalisation': personalisation
    }

    error_json = letter_request(client, data, service_id=service.id, _expected_status=400)

    assert error_json['status_code'] == 400
    assert error_json['errors'] == [{
        'error': 'ValidationError',
        'message': expected_error
    }]


@pytest.mark.parametrize('env', [
    'staging',
    'live',
])
def test_post_letter_notification_with_test_key_creates_pdf_and_sets_status_to_delivered(
        notify_api, client, sample_letter_template, mocker, env):

    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': 'SW1 1AA',
            'name': 'Lizzie'
        },
        'reference': 'foo'
    }

    fake_create_letter_task = mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    fake_create_dvla_response_task = mocker.patch(
        'app.celery.research_mode_tasks.create_fake_letter_response_file.apply_async')

    with set_config_values(notify_api, {
        'NOTIFY_ENVIRONMENT': env
    }):
        letter_request(client, data, service_id=sample_letter_template.service_id, key_type=KEY_TYPE_TEST)

    notification = Notification.query.one()

    fake_create_letter_task.assert_called_once_with([str(notification.id)], queue='research-mode-tasks')
    assert not fake_create_dvla_response_task.called
    assert notification.status == NOTIFICATION_DELIVERED
    assert notification.updated_at is not None


@pytest.mark.parametrize('env', [
    'development',
    'preview',
])
def test_post_letter_notification_with_test_key_creates_pdf_and_sets_status_to_sending_and_sends_fake_response_file(
        notify_api, client, sample_letter_template, mocker, env):

    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': {
            'address_line_1': 'Her Royal Highness Queen Elizabeth II',
            'address_line_2': 'Buckingham Palace',
            'address_line_3': 'London',
            'postcode': 'SW1 1AA',
            'name': 'Lizzie'
        },
        'reference': 'foo'
    }

    fake_create_letter_task = mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    fake_create_dvla_response_task = mocker.patch(
        'app.celery.research_mode_tasks.create_fake_letter_response_file.apply_async')
    with set_config_values(notify_api, {
        'NOTIFY_ENVIRONMENT': env
    }):
        letter_request(client, data, service_id=sample_letter_template.service_id, key_type=KEY_TYPE_TEST)

    notification = Notification.query.one()

    fake_create_letter_task.assert_called_once_with([str(notification.id)], queue='research-mode-tasks')
    assert fake_create_dvla_response_task.called
    assert notification.status == NOTIFICATION_SENDING


def test_post_letter_notification_returns_400_and_missing_template(
    client,
    sample_service_full_permissions
):
    data = {
        'template_id': str(uuid.uuid4()),
        'personalisation': test_address
    }

    error_json = letter_request(client, data, service_id=sample_service_full_permissions.id, _expected_status=400)

    assert error_json['status_code'] == 400
    assert error_json['errors'] == [{'error': 'BadRequestError', 'message': 'Template not found'}]


def test_post_letter_notification_returns_400_for_empty_personalisation(
    client,
    sample_service_full_permissions,
    sample_letter_template
):
    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': {'address_line_1': '', 'address_line_2': '', 'postcode': ''}
    }

    error_json = letter_request(client, data, service_id=sample_service_full_permissions.id, _expected_status=400)

    assert error_json['status_code'] == 400
    assert all([e['error'] == 'ValidationError' for e in error_json['errors']])
    assert set([e['message'] for e in error_json['errors']]) == {
        'Address must be at least 3 lines',
    }


def test_post_notification_returns_400_for_missing_letter_contact_block_personalisation(
    client,
    sample_service,
):
    letter_contact_block = create_letter_contact(
        service=sample_service, contact_block='((contact block))', is_default=True
    )
    template = create_template(
        service=sample_service,
        template_type='letter',
        reply_to=letter_contact_block.id,
    )
    data = {
        'template_id': str(template.id),
        'personalisation': {
            'address_line_1': 'Line 1',
            'address_line_2': 'Line 2',
            'postcode': 'SW1A 1AA',
        },
    }

    error_json = letter_request(
        client,
        data,
        service_id=sample_service.id,
        _expected_status=400,
    )

    assert error_json['status_code'] == 400
    assert error_json['errors'] == [{
        'error': 'BadRequestError',
        'message': 'Missing personalisation: contact block'
    }]


def test_notification_returns_400_for_missing_template_field(
    client,
    sample_service_full_permissions
):
    data = {
        'personalisation': test_address
    }

    error_json = letter_request(client, data, service_id=sample_service_full_permissions.id, _expected_status=400)

    assert error_json['status_code'] == 400
    assert error_json['errors'] == [{
        'error': 'ValidationError',
        'message': 'template_id is a required property'
    }]


def test_notification_returns_400_if_address_doesnt_have_underscores(
    client,
    sample_letter_template
):
    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': {
            'address line 1': 'Her Royal Highness Queen Elizabeth II',
            'address-line-2': 'Buckingham Palace',
            'postcode': 'SW1 1AA',
        }
    }

    error_json = letter_request(client, data, service_id=sample_letter_template.service_id, _expected_status=400)

    assert error_json['status_code'] == 400
    assert error_json['errors'] == [
        {
            'error': 'ValidationError',
            'message': 'Address must be at least 3 lines'
        }
    ]


def test_returns_a_429_limit_exceeded_if_rate_limit_exceeded(
    client,
    sample_letter_template,
    mocker
):
    persist_mock = mocker.patch('app.v2.notifications.post_notifications.persist_notification')
    mocker.patch(
        'app.v2.notifications.post_notifications.check_rate_limiting',
        side_effect=RateLimitError('LIMIT', 'INTERVAL', 'TYPE')
    )

    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': test_address
    }

    error_json = letter_request(client, data, service_id=sample_letter_template.service_id, _expected_status=429)

    assert error_json['status_code'] == 429
    assert error_json['errors'] == [{
        'error': 'RateLimitError',
        'message': 'Exceeded rate limit for key type TYPE of LIMIT requests per INTERVAL seconds'
    }]

    assert not persist_mock.called


@pytest.mark.parametrize('service_args, expected_status, expected_message', [
    (
        {'service_permissions': [EMAIL_TYPE, SMS_TYPE]},
        400,
        'Service is not allowed to send letters',
    ),
    (
        {'restricted': True},
        403,
        'Cannot send letters when service is in trial mode',
    )
])
def test_post_letter_notification_returns_403_if_not_allowed_to_send_notification(
    client,
    notify_db_session,
    service_args,
    expected_status,
    expected_message,
):
    service = create_service(**service_args)
    template = create_template(service, template_type=LETTER_TYPE)

    data = {
        'template_id': str(template.id),
        'personalisation': test_address
    }

    error_json = letter_request(client, data, service_id=service.id, _expected_status=expected_status)
    assert error_json['status_code'] == expected_status
    assert error_json['errors'] == [
        {'error': 'BadRequestError', 'message': expected_message}
    ]


def test_post_letter_notification_doesnt_accept_team_key(client, sample_letter_template, mocker):
    mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(sample_letter_template.id),
        'personalisation': {'address_line_1': 'Foo', 'address_line_2': 'Bar', 'postcode': 'Baz'}
    }

    error_json = letter_request(
        client,
        data,
        sample_letter_template.service_id,
        key_type=KEY_TYPE_TEAM,
        _expected_status=403
    )

    assert error_json['status_code'] == 403
    assert error_json['errors'] == [{'error': 'BadRequestError', 'message': 'Cannot send letters with a team api key'}]


def test_post_letter_notification_doesnt_send_in_trial(client, sample_trial_letter_template, mocker):
    mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')
    data = {
        'template_id': str(sample_trial_letter_template.id),
        'personalisation': {'address_line_1': 'Foo', 'address_line_2': 'Bar', 'postcode': 'Baz'}
    }

    error_json = letter_request(
        client,
        data,
        sample_trial_letter_template.service_id,
        _expected_status=403
    )

    assert error_json['status_code'] == 403
    assert error_json['errors'] == [
        {'error': 'BadRequestError', 'message': 'Cannot send letters when service is in trial mode'}]


def test_post_letter_notification_is_delivered_but_still_creates_pdf_if_in_trial_mode_and_using_test_key(
    client,
    sample_trial_letter_template,
    mocker
):
    fake_create_letter_task = mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')

    data = {
        "template_id": sample_trial_letter_template.id,
        "personalisation": {'address_line_1': 'Foo', 'address_line_2': 'Bar', 'postcode': 'BA5 5AB'}
    }

    letter_request(client, data=data, service_id=sample_trial_letter_template.service_id, key_type=KEY_TYPE_TEST)

    notification = Notification.query.one()
    assert notification.status == NOTIFICATION_DELIVERED
    fake_create_letter_task.assert_called_once_with([str(notification.id)], queue='research-mode-tasks')


def test_post_letter_notification_is_delivered_and_has_pdf_uploaded_to_test_letters_bucket_using_test_key(
    client,
    notify_user,
    mocker
):
    sample_letter_service = create_service(service_permissions=['letter'])
    mocker.patch('app.celery.letters_pdf_tasks.notify_celery.send_task')
    s3mock = mocker.patch('app.v2.notifications.post_notifications.upload_letter_pdf', return_value='test.pdf')
    data = {
        "reference": "letter-reference",
        "content": "bGV0dGVyLWNvbnRlbnQ="
    }
    letter_request(
        client,
        data=data,
        service_id=str(sample_letter_service.id),
        key_type=KEY_TYPE_TEST,
        precompiled=True)

    notification = Notification.query.one()
    assert notification.status == NOTIFICATION_PENDING_VIRUS_CHECK
    s3mock.assert_called_once_with(ANY, b'letter-content', precompiled=True)


def test_post_letter_notification_ignores_reply_to_text_for_service(
    client, notify_db_session, mocker
):
    mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')

    service = create_service(service_permissions=[LETTER_TYPE])
    create_letter_contact(service=service, contact_block='ignored', is_default=True)
    template = create_template(service=service, template_type='letter')
    data = {
        "template_id": template.id,
        "personalisation": {'address_line_1': 'Foo', 'address_line_2': 'Bar', 'postcode': 'BA5 5AB'}
    }
    letter_request(client, data=data, service_id=service.id, key_type=KEY_TYPE_NORMAL)

    notifications = Notification.query.all()
    assert len(notifications) == 1
    assert notifications[0].reply_to_text is None


def test_post_letter_notification_persists_notification_reply_to_text_for_template(
    client, notify_db_session, mocker
):
    mocker.patch('app.celery.letters_pdf_tasks.get_pdf_for_templated_letter.apply_async')

    service = create_service(service_permissions=[LETTER_TYPE])
    create_letter_contact(service=service, contact_block='the default', is_default=True)
    template_letter_contact = create_letter_contact(service=service, contact_block='not the default', is_default=False)
    template = create_template(service=service, template_type='letter', reply_to=template_letter_contact.id)
    data = {
        "template_id": template.id,
        "personalisation": {'address_line_1': 'Foo', 'address_line_2': 'Bar', 'postcode': 'BA5 5AB'}
    }
    letter_request(client, data=data, service_id=service.id, key_type=KEY_TYPE_NORMAL)

    notifications = Notification.query.all()
    assert len(notifications) == 1
    assert notifications[0].reply_to_text == 'not the default'


def test_post_precompiled_letter_with_invalid_base64(client, notify_user, mocker):
    sample_service = create_service(service_permissions=['letter'])
    mocker.patch('app.v2.notifications.post_notifications.upload_letter_pdf')

    data = {
        "reference": "letter-reference",
        "content": "hi"
    }
    auth_header = create_service_authorization_header(service_id=sample_service.id)
    response = client.post(
        path="v2/notifications/letter",
        data=json.dumps(data),
        headers=[('Content-Type', 'application/json'), auth_header])

    assert response.status_code == 400, response.get_data(as_text=True)
    resp_json = json.loads(response.get_data(as_text=True))
    assert resp_json['errors'][0]['message'] == 'Cannot decode letter content (invalid base64 encoding)'

    assert not Notification.query.first()


@pytest.mark.parametrize('notification_postage, expected_postage', [
    ('second', 'second'),
    ('first', 'first'),
    (None, 'second')
])
def test_post_precompiled_letter_notification_returns_201(
    client, notify_user, mocker, notification_postage, expected_postage
):
    sample_service = create_service(service_permissions=['letter'])
    s3mock = mocker.patch('app.v2.notifications.post_notifications.upload_letter_pdf')
    mocker.patch('app.celery.letters_pdf_tasks.notify_celery.send_task')
    data = {
        "reference": "letter-reference",
        "content": "bGV0dGVyLWNvbnRlbnQ="
    }
    if notification_postage:
        data["postage"] = notification_postage
    auth_header = create_service_authorization_header(service_id=sample_service.id)
    response = client.post(
        path="v2/notifications/letter",
        data=json.dumps(data),
        headers=[('Content-Type', 'application/json'), auth_header])

    assert response.status_code == 201, response.get_data(as_text=True)

    s3mock.assert_called_once_with(ANY, b'letter-content', precompiled=True)

    notification = Notification.query.one()

    assert notification.billable_units == 0
    assert notification.status == NOTIFICATION_PENDING_VIRUS_CHECK
    assert notification.postage == expected_postage

    resp_json = json.loads(response.get_data(as_text=True))
    assert resp_json == {'id': str(notification.id), 'reference': 'letter-reference', 'postage': expected_postage}


def test_post_precompiled_letter_notification_if_s3_upload_fails_notification_is_not_persisted(
    client, notify_user, mocker
):
    sample_service = create_service(service_permissions=['letter'])
    persist_letter_mock = mocker.patch('app.v2.notifications.post_notifications.create_letter_notification',
                                       side_effect=create_letter_notification)
    s3mock = mocker.patch('app.v2.notifications.post_notifications.upload_letter_pdf', side_effect=Exception())
    mocker.patch('app.celery.letters_pdf_tasks.notify_celery.send_task')
    data = {
        "reference": "letter-reference",
        "content": "bGV0dGVyLWNvbnRlbnQ="
    }

    auth_header = create_service_authorization_header(service_id=sample_service.id)
    with pytest.raises(expected_exception=Exception):
        client.post(
            path="v2/notifications/letter",
            data=json.dumps(data),
            headers=[('Content-Type', 'application/json'), auth_header])

    assert s3mock.called
    assert persist_letter_mock.called
    assert Notification.query.count() == 0


def test_post_letter_notification_throws_error_for_invalid_postage(client, notify_user, mocker):
    sample_service = create_service(service_permissions=['letter'])
    data = {
        "reference": "letter-reference",
        "content": "bGV0dGVyLWNvbnRlbnQ=",
        "postage": "space unicorn"
    }
    auth_header = create_service_authorization_header(service_id=sample_service.id)
    response = client.post(
        path="v2/notifications/letter",
        data=json.dumps(data),
        headers=[('Content-Type', 'application/json'), auth_header])

    assert response.status_code == 400, response.get_data(as_text=True)
    resp_json = json.loads(response.get_data(as_text=True))
    assert resp_json['errors'][0]['message'] == "postage invalid. It must be first, second, europe or rest-of-world."

    assert not Notification.query.first()


@pytest.mark.parametrize('content_type',
                         ['application/json', 'application/text'])
def test_post_letter_notification_when_payload_is_invalid_json_returns_400(
        client, sample_service, content_type):
    auth_header = create_service_authorization_header(service_id=sample_service.id)
    payload_not_json = {
        "template_id": "dont-convert-to-json",
    }
    response = client.post(
        path='/v2/notifications/letter',
        data=payload_not_json,
        headers=[('Content-Type', content_type), auth_header],
    )

    assert response.status_code == 400
    error_msg = json.loads(response.get_data(as_text=True))["errors"][0]["message"]

    assert error_msg == 'Invalid JSON supplied in POST data'