""" Test factory function for auto-creating tests for encodings having __examples__ defined. """

def _template(self):

tfile = "test-codec-%s.txt" % params['name']

icase = params.get('ignore_case')

icdec = lambda s: s.lower() if icase in ["decode", "both"] else s

icenc = lambda s: s.lower() if icase in ["encode", "both"] else s

# first, define if only encode is used ; if so, decoding must occur right after encode tests, otherwise just

# execute the defined decode tests

dec = True

for k in params['examples'].keys():

if k.startswith("dec"):

dec = False

# now execute tests relying on the given examples

for k, examples in params['examples'].items():

# multiple encoding names can be given, e.g. 'enc(morse|morse-AB|...)'

m = re.match(r"(?:dec|enc|enc-dec)\((.*?)(?:\|(.*?))*\)", k)

if m:

f1 = getattr(codecs, ["decode", "encode"][k.startswith("enc")])

f2 = getattr(codecs, ["encode", "decode"][k.startswith("enc")])

for ename in m.groups():

if ename is None:

continue

# erroneous encoding name test

if examples is None:

self.assertRaises(LookupError, f1, "test", ename)

continue

# unhandled character error tests

encmap = params.get('encmap')

if encmap and params['intype'] not in ["bin", "ord"] and not params['no_error']:

if not isinstance(encmap, list):

encmap = [encmap]

for em in encmap:

if k.startswith("dec"):

em = {v: k for k, v in em.items()}

# find one handled character and one unhandled

c1, c2 = None, None

p = list(map(ord, printable))

for i in chain(p, set(range(256)) - set(p)):

if chr(i) in em.keys():

c1 = chr(i)

break

for i in chain(set(range(256)) - set(p), p):

if chr(i) not in em.keys():

c2 = chr(i)

break

# now check that it raises the right error or not given the selected errors handling

if c1 and c2:

sep = params['sep'][0] if len(params['sep']) > 0 else ""

self.assertRaises(ValueError, f1, c2, ename)

self.assertRaises(ValueError, f1, c2, ename, "BAD_ERRORS")

if not k.startswith("enc-dec"):

self.assertEqual(f1(c1 + c2, ename, "ignore"), f1(c1, ename))

self.assertEqual(f1(c1 + c2, ename, "leave"), f1(c1, ename) + sep + c2)

self.assertEqual(f1(c1 + c2, ename, "replace"), f1(c1, ename) + sep + \

params.get('repl_minlen', 1) * params['repl_char'])

# examples validation tests

if k.startswith("enc-dec") and isinstance(examples, list):

for s in examples:

self.assertEqual(icdec(f2(icenc(f1(s, ename)), ename)), icdec(s))

self.assertEqual(icdec(f2(icenc(f1(b(s), ename)), ename)), b(icdec(s)))

# file tests

with codecs.open(tfile, 'wb', encoding=ename) as f:

f.write(b(s))

with codecs.open(tfile, 'rb', encoding=ename) as f:

s2 = f.read().strip(b("\x00"))

self.assertEqual(b(icdec(s2)), b(icdec(s)))

os.remove(tfile)

else:

for s1, s2 in examples.items():

# willingly erroneous tests

if s2 is None:

self.assertRaises(ValueError, f1, s1, ename)

continue

# raw text tests

self.assertEqual(icenc(f1(s1, ename)), icenc(s2))

self.assertEqual(b(icenc(f1(s1, ename))), b(icenc(s2)))

self.assertIsNotNone(f1(s1, ename, "replace"))

self.assertIsNotNone(f1(s1, ename, "ignore"))

if dec:

self.assertEqual(icdec(f2(s2, ename)), icdec(s1))

self.assertEqual(b(icdec(f2(s2, ename))), b(icdec(s1)))

self.assertIsNotNone(f2(s2, ename, "replace"))

self.assertIsNotNone(f2(s2, ename, "ignore"))

if k.startswith("enc"):

# file tests

with codecs.open(tfile, 'wb', encoding=ename) as f:

f.write(b(s1))

with codecs.open(tfile, 'rb', encoding=ename) as f:

s = f.read().strip(b("\x00"))

self.assertEqual(b(icdec(f2(s2, ename))), b(icdec(s)))

os.remove(tfile)