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test_suites_functional.py
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test_suites_functional.py
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# =================================================================
#
# Authors: Ricardo Garcia Silva <ricardo.garcia.silva@gmail.com>
# Tom Kralidis <tomkralidis@gmail.com>
#
# Copyright (c) 2017 Ricardo Garcia Silva
# Copyright (c) 2017 Tom Kralidis
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# =================================================================
"""Functional tests for several test suites"""
import codecs
from difflib import SequenceMatcher
from difflib import unified_diff
from io import BytesIO
import json
import os
import re
import wsgiref.util
from lxml import etree
from lxml import objectify
import pytest
from pycsw import server
pytestmark = pytest.mark.functional
def test_suites(test_identifier, use_xml_canonicalisation,
save_results_directory, configuration, request_method,
request_data, expected_result, normalize_identifier_fields):
"""Test suites.
This function is automatically parametrized by pytest as a result of the
``conftest:pytest_generate_tests`` function. The input parameters are thus
supplied by pytest as a result of discovering and parsing the existing
test suites located under ``tests/functionaltests/suites``.
Parameters
----------
configuration: SafeConfigParser
The configuration to use with the pycsw server instance under test
request_method: str
The HTTP method of the request. Either GET or POST.
request_data: str
Either the path to the request file, for POST requests, or the request
parameters, for GET requests
expected_result: str
Path to the file that holds the expected result
normalize_identifier_fields: bool
Whether to normalize the identifier fields in responses. This
parameter is used only in the 'harvesting' and 'manager' suites
use_xml_canonicalisation: bool
Whether to compare results with their expected values by using xml
canonicalisation or simply by doing a diff.
save_results_directory: str
Path to a directory where to test results should be saved to. A value
of ``None`` (the default) means that results will not get saved to
disk.
"""
request_environment = _prepare_wsgi_test_environment(request_method,
request_data)
pycsw_server = server.Csw(rtconfig=configuration, env=request_environment)
encoding = "utf-8"
status, raw_contents = pycsw_server.dispatch_wsgi()
contents = raw_contents.decode(encoding)
with codecs.open(expected_result, encoding=encoding) as fh:
expected = fh.read()
normalized_result = _normalize(
contents,
normalize_identifiers=normalize_identifier_fields
)
if use_xml_canonicalisation:
print("Comparing results using XML canonicalization...")
matches_expected = _compare_with_xml_canonicalisation(
normalized_result, expected)
else:
print("Comparing results using diffs...")
matches_expected = _compare_without_xml_canonicalisation(
normalized_result, expected)
if not matches_expected and use_xml_canonicalisation:
print("expected: {0}".format(expected))
print("response: {0}".format(normalized_result))
if save_results_directory is not None:
_save_test_result(save_results_directory, normalized_result,
test_identifier, encoding)
assert matches_expected
def _compare_with_xml_canonicalisation(normalized_result, expected):
try:
matches_expected = _test_xml_result(normalized_result, expected)
except etree.XMLSyntaxError:
# the file is either not XML (perhaps JSON?) or malformed
matches_expected = _test_json_result(normalized_result, expected)
except etree.C14NError:
print("XML canonicalisation has failed. Trying to compare result "
"with expected using difflib")
matches_expected = _test_xml_diff(normalized_result, expected)
return matches_expected
def _compare_without_xml_canonicalisation(normalized_result, expected):
return _test_xml_diff(normalized_result, expected)
def _prepare_wsgi_test_environment(request_method, request_data):
"""Set up a testing environment for tests.
Parameters
----------
request_method: str
The HTTP method of the request. Sould be either GET or POST.
request_data: str
Either the path to the request file, for POST requests or the request
parameters, for GET requests.
Returns
-------
request_environment: dict
A mapping with the environment variables to use in the test
"""
request_environment = {
"REQUEST_METHOD": request_method.upper(),
"QUERY_STRING": "",
"REMOTE_ADDR": "127.0.0.1"
}
if request_method == "POST":
print("request_path: {0}".format(request_data))
request_buffer = BytesIO()
encoding = "utf-8"
with codecs.open(request_data, encoding=encoding) as fh:
contents = fh.read()
request_buffer.write(contents.encode(encoding))
request_environment["CONTENT_LENGTH"] = request_buffer.tell()
request_buffer.seek(0)
request_environment["wsgi.input"] = request_buffer
else:
print("Request contents: {0}".format(request_data))
request_environment["QUERY_STRING"] = request_data
wsgiref.util.setup_testing_defaults(request_environment)
return request_environment
def _test_xml_result(result, expected, encoding="utf-8"):
"""Compare the XML test results with an expected value.
This function compares the test result with the expected values by
performing XML canonicalization (c14n)[1]_, which compares the semantic
meanings of both XML files.
Parameters
----------
result: str
The result of running the test as a unicode string
expected: str
The expected outcome as a unicode string.
Returns
-------
bool
Whether the result matches the expectations or not.
Raises
------
etree.XMLSyntaxError
If any of the input parameters is not a valid XMl.
etree.C14NError
If any of the input parameters cannot be canonicalized. This may
happen if there are relative namespace URIs in any of the XML
documents, as they are explicitly not allowed when doing XML c14n
References
----------
.. [1] http://www.w3.org/TR/xml-c14n
"""
result_element = etree.fromstring(result.encode(encoding))
expected_element = etree.fromstring(expected.encode(encoding))
result_buffer = BytesIO()
result_tree = result_element.getroottree()
objectify.deannotate(result_tree, cleanup_namespaces=True)
result_tree.write_c14n(result_buffer)
expected_buffer = BytesIO()
expected_tree = expected_element.getroottree()
objectify.deannotate(expected_tree, cleanup_namespaces=True)
expected_tree.write_c14n(expected_buffer)
matches = result_buffer.getvalue() == expected_buffer.getvalue()
return matches
def _test_json_result(result, expected, encoding="utf-8"):
"""Compare the JSON test results with an expected value.
Parameters
----------
result: str
The result of running the test.
expected: str
The expected outcome.
Returns
-------
bool
Whether the result matches the expectations or not.
"""
result_dict = json.loads(result, encoding=encoding)
expected_dict = json.loads(expected, encoding=encoding)
return result_dict == expected_dict
def _test_xml_diff(result, expected):
"""Compare two XML strings by using python's ``difflib.SequenceMatcher``.
This is a character-by-character comparison and does not take into account
the semantic meaning of XML elements and attributes.
Parameters
----------
result: str
The result of running the test.
expected: str
The expected outcome.
Returns
-------
bool
Whether the result matches the expectations or not.
"""
sequence_matcher = SequenceMatcher(None, result, expected)
ratio = sequence_matcher.ratio()
matches = ratio == pytest.approx(1.0)
if not matches:
print("Result does not match expected.")
diff = unified_diff(result.splitlines(), expected.splitlines())
print("\n".join(list(diff)))
return matches
def _normalize(sresult, normalize_identifiers=False):
"""Normalize test output so it can be compared with the expected result.
Several dynamic elements of a pycsw response (such as time,
updateSequence, etc) are replaced with static constants to ease comparison.
Parameters
----------
sresult: str
The test result as a unicode string.
normalize_identifiers: bool, optional
Whether identifier fields should be normalized.
Returns
-------
str
The normalized response.
"""
# XML responses
version = re.search(r'<!-- (.*) -->', sresult)
updatesequence = re.search(r'updateSequence="(\S+)"', sresult)
timestamp = re.search(r'timestamp="(.*)"', sresult)
timestamp2 = re.search(r'timeStamp="(.*)"', sresult)
timestamp3 = re.search(
r'<oai:responseDate>(.*)</oai:responseDate>',
sresult
)
timestamp4 = re.search(
r'<oai:earliestDatestamp>(.*)</oai:earliestDatestamp>',
sresult
)
zrhost = re.search(r'<zr:host>(.*)</zr:host>', sresult)
zrport = re.search(r'<zr:port>(.*)</zr:port>', sresult)
elapsed_time = re.search(r'elapsedTime="(.*)"', sresult)
expires = re.search(r'expires="(.*?)"', sresult)
atom_updated = re.findall(r'<atom:updated>(.*)</atom:updated>',
sresult)
if version:
sresult = sresult.replace(version.group(0),
r'<!-- PYCSW_VERSION -->')
if updatesequence:
sresult = sresult.replace(updatesequence.group(0),
r'updateSequence="PYCSW_UPDATESEQUENCE"')
if timestamp:
sresult = sresult.replace(timestamp.group(0),
r'timestamp="PYCSW_TIMESTAMP"')
if timestamp2:
sresult = sresult.replace(timestamp2.group(0),
r'timeStamp="PYCSW_TIMESTAMP"')
if timestamp3:
sresult = sresult.replace(
timestamp3.group(0),
r'<oai:responseDate>PYCSW_TIMESTAMP</oai:responseDate>'
)
if timestamp4:
sresult = sresult.replace(
timestamp4.group(0),
r'<oai:earliestDatestamp>PYCSW_TIMESTAMP</oai:earliestDatestamp>'
)
if zrport:
sresult = sresult.replace(zrport.group(0),
r'<zr:port>PYCSW_PORT</zr:port>')
if zrhost:
sresult = sresult.replace(zrhost.group(0),
r'<zr:host>PYCSW_HOST</zr:host>')
if elapsed_time:
sresult = sresult.replace(elapsed_time.group(0),
r'elapsedTime="PYCSW_ELAPSED_TIME"')
if expires:
sresult = sresult.replace(expires.group(0),
r'expires="PYCSW_EXPIRES"')
for au in atom_updated:
sresult = sresult.replace(au, r'PYCSW_TIMESTAMP')
# for csw:HarvestResponse documents, mask identifiers
# which are dynamically generated for OWS endpoints
if sresult.find(r'HarvestResponse') != -1:
identifier = re.findall(
r'<dc:identifier>(\S+)</dc:identifier>',
sresult
)
for i in identifier:
sresult = sresult.replace(i, r'PYCSW_IDENTIFIER')
# JSON responses
timestamp = re.search(r'"@timestamp": "(.*?)"', sresult)
if timestamp:
sresult = sresult.replace(timestamp.group(0),
r'"@timestamp": "PYCSW_TIMESTAMP"')
# harvesting-based GetRecords/GetRecordById responses
if normalize_identifiers:
dcid = re.findall(
r'<dc:identifier>(urn:uuid.*)</dc:identifier>',
sresult
)
isoid = re.findall(r'id="(urn:uuid.*)"', sresult)
isoid2 = re.findall(
r'<gco:CharacterString>(urn:uuid.*)</gco',
sresult
)
for d in dcid:
sresult = sresult.replace(d, r'PYCSW_IDENTIFIER')
for i in isoid:
sresult = sresult.replace(i, r'PYCSW_IDENTIFIER')
for i2 in isoid2:
sresult = sresult.replace(i2, r'PYCSW_IDENTIFIER')
return sresult
def _save_test_result(target_directory_path, test_result, filename, encoding):
"""Save the input test result to disk"""
full_directory_path = os.path.abspath(
os.path.expanduser(os.path.expandvars(target_directory_path)))
try:
os.makedirs(full_directory_path)
except OSError as exc:
if exc.errno == 17: # directory already exists
pass
else:
raise
target_path = os.path.join(full_directory_path, filename)
with codecs.open(target_path, "w", encoding=encoding) as fh:
fh.write(test_result)
return target_path