document_function_test.py

# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from unittest import mock

import flask
from google.cloud import documentai
import pytest

import document_function

_BIGQUERY_REQUEST_JSON = {
    "calls": [
        ["https://storage.googleapis.com/bucket/apple", "application/pdf"],
        ["https://storage.googleapis.com/bucket/banana", "application/pdf"],
    ]
}
_BIGQUERY_RESPONSE_JSON = {
    "replies": [
        {"text": "apple"},
        {"text": "banana"},
    ]
}


# Create a fake "app" for generating test request contexts.
@pytest.fixture(scope="module")
def app() -> flask.Flask:
    return flask.Flask(__name__)


@mock.patch("document_function.urllib.request")
@mock.patch("document_function.documentai")
def test_document_function(
    mock_documentai: object,
    mock_request: object,
    app: flask.Flask,
) -> None:
    mock_request.urlopen = mock.Mock(read=mock.Mock(return_value=b"filedata"))
    process_document_mock = mock.Mock(
        side_effect=[
            documentai.ProcessResponse({"document": {"text": "apple"}}),
            documentai.ProcessResponse({"document": {"text": "banana"}}),
        ]
    )
    mock_documentai.DocumentProcessorServiceClient = mock.Mock(
        return_value=mock.Mock(process_document=process_document_mock)
    )
    with app.test_request_context(json=_BIGQUERY_REQUEST_JSON):
        response = document_function.document_ocr(flask.request)
        assert response.status_code == 200
        assert response.get_json() == _BIGQUERY_RESPONSE_JSON


@mock.patch("document_function.urllib.request")
@mock.patch("document_function.documentai")
def test_document_function_error(
    mock_documentai: object,
    mock_request: object,
    app: flask.Flask,
) -> None:
    mock_request.urlopen = mock.Mock(read=mock.Mock(return_value=b"filedata"))
    process_document_mock = mock.Mock(side_effect=Exception("API error"))
    mock_documentai.DocumentProcessorServiceClient = mock.Mock(
        return_value=mock.Mock(process_document=process_document_mock)
    )
    with app.test_request_context(json=_BIGQUERY_REQUEST_JSON):
        response = document_function.document_ocr(flask.request)
        assert response.status_code == 400
        assert "API error" in str(response.get_data())