def test_check_format(headers):
args = {'f': 'html'}
headers_ = headers.copy()
assert check_format({}, headers_) is None
assert check_format(args, headers_) == 'html'
args['f'] = 'json'
assert check_format(args, headers_) == 'json'
headers_['Accept'] = 'text/html'
assert check_format({}, headers_) == 'html'
headers_['Accept'] = 'application/json'
assert check_format({}, headers_) == 'json'
headers_['accept'] = 'text/html'
assert check_format({}, headers_) == 'html'
hh = 'text/html,application/xhtml+xml,application/xml;q=0.9,'
headers_['Accept'] = hh
assert check_format({}, headers_) == 'html'
headers_['accept'] = hh
assert check_format({}, headers_) == 'html'
def test_check_format():
args = {'f': 'html'}
req_headers = {}
assert check_format({}, req_headers) is None
assert check_format(args, req_headers) == 'html'
args['f'] = 'json'
assert check_format(args, req_headers) == 'json'
args['f'] = 'jsonld'
assert check_format(args, req_headers) == 'jsonld'
args['f'] = 'html'
assert check_format(args, req_headers) == 'html'
req_headers['Accept'] = 'text/html'
assert check_format({}, req_headers) == 'html'
req_headers['Accept'] = 'application/json'
assert check_format({}, req_headers) == 'json'
req_headers['Accept'] = 'application/ld+json'
assert check_format({}, req_headers) == 'jsonld'
req_headers['accept'] = 'text/html'
assert check_format({}, req_headers) == 'html'
hh = 'text/html,application/xhtml+xml,application/xml;q=0.9,'
req_headers['Accept'] = hh
assert check_format({}, req_headers) == 'html'
req_headers['accept'] = hh
assert check_format({}, req_headers) == 'html'
req_headers = make_req_headers(HTTP_ACCEPT=hh)
assert check_format({}, req_headers) == 'html'
req_headers = make_req_headers(HTTP_ACCEPT='text/html')
assert check_format({}, req_headers) == 'html'
req_headers = make_req_headers(HTTP_ACCEPT='application/json')
assert check_format({}, req_headers) == 'json'
req_headers = make_req_headers(HTTP_ACCEPT='application/ld+json')
assert check_format({}, req_headers) == 'jsonld'
# Overrule HTTP content negotiation
args['f'] = 'html'
assert check_format(args, req_headers) == 'html'
req_headers = make_req_headers(HTTP_ACCEPT='text/html')
args['f'] = 'json'
assert check_format(args, req_headers) == 'json'
