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pipe_tests.py
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/
pipe_tests.py
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from unittest import TestCase
from pious.transform.pipes import Pipe, Ensure, Rename
from pious.transform.pipes import RemoveKeys, AutoIncrement
class PipeTest(TestCase):
def test_bind_accepts_iterator(self):
a = [1, 2, 3]
p = Pipe()
try:
p.bind(a)
except Exception:
self.fail("pipe.bind() raised an unexpectedly exception!")
def test_bind_pukes_if_not_passed_an_iterator(self):
p = Pipe()
self.assertRaises(Exception, p, {})
class EnsureTest(TestCase):
def test_sets_undefined_key(self):
a = [
{'a': 1, 'b': 1}
]
p = Ensure({'c': 2})
p.bind(a)
for i in p:
self.assertIn('c', i)
def test_does_not_overwrite_existing_key(self):
a = [
{'a': 1, 'b': 1}
]
p = Ensure({'a': 2})
p.bind(a)
for i in p:
self.assertIn('a', i)
self.assertEquals(i['a'], 1)
class RenameTest(TestCase):
def test_renames_single_key(self):
test_data = [
{'old_key': 'a_value'},
{'old_key': 'a_value'}
]
key_map = {
'old_key': 'new_key'
}
p = Rename(key_map)
p.bind(test_data)
for i in p:
self.assertIn('new_key', i)
self.assertEquals(i['new_key'], 'a_value')
self.assertNotIn('old_key', i)
def test_renames_multiple_keys(self):
test_data = [
{
'old_key1': 'a_value1',
'old_key2': 'a_value2'
},
{
'old_key1': 'a_value1',
'old_key2': 'a_value2'
},
]
key_map = {
'old_key1': 'new_key1',
'old_key2': 'new_key2'
}
p = Rename(key_map)
p.bind(test_data)
for i in p:
self.assertIn('new_key1', i)
self.assertEquals(i['new_key1'], 'a_value1')
self.assertNotIn('old_key1', i)
self.assertIn('new_key2', i)
self.assertEquals(i['new_key2'], 'a_value2')
self.assertNotIn('old_key2', i)
class RemoveKeysTest(TestCase):
def test_single_key_removed(self):
test_data = [
{'a_key': 'a_value'},
]
keys = [
'a_key'
]
p = RemoveKeys(keys)
p.bind(test_data)
for i in p:
self.assertNotIn('a_key', i)
def test_remaining_key_unaffected(self):
test_data = [
{'a_key': 'a_value', 'a_n_other_key': 'a_n_other_value'},
]
keys = [
'a_key'
]
p = RemoveKeys(keys)
p.bind(test_data)
for i in p:
self.assertNotIn('a_key', i)
self.assertIn('a_n_other_key', i)
self.assertEquals(i['a_n_other_key'], 'a_n_other_value')
class AutoIncrementTest(TestCase):
def test_key_added(self):
test_data = [
{'a': 'b'},
{'a': 'b'}
]
p = AutoIncrement('counter')
p.bind(test_data)
for i in p:
self.assertIn('counter', i)
def test_key_increments(self):
test_data = [
{'a': 'b'},
{'a': 'b'}
]
p = AutoIncrement('counter')
p.bind(test_data)
c = 0
for i in p:
c += 1
self.assertIn('counter', i)
self.assertEquals(i['counter'], c)
def test_key_increment_interval(self):
test_data = [
{'a': 'b'},
{'a': 'b'}
]
p = AutoIncrement('counter', interval=2)
p.bind(test_data)
c = 0
for i in p:
c += 2
self.assertIn('counter', i)
self.assertEquals(i['counter'], c)
def test_key_increment_start(self):
test_data = [
{'a': 'b'},
{'a': 'b'}
]
p = AutoIncrement('counter', start_value=2)
p.bind(test_data)
c = 2
for i in p:
c += 1
self.assertIn('counter', i)
self.assertEquals(i['counter'], c)