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"""
Tests for L{eliot._util}.
"""
from unittest import TestCase
import pprint
from .._util import load_module
class LoadModuleTests(TestCase):
"""
Tests for L{load_module}.
"""
maxDiff = None
def test_returns_module(self):
"""
L{load_module} returns an object with same methods as original module.
"""
loaded = load_module(str("copy"), pprint)
obj = [1, 2, b"hello"]
self.assertEqual(loaded.pformat(obj), pprint.pformat(obj))
def test_name(self):
"""
L{load_module} returns an object with the given name.
"""
name = str("my_copy")
loaded = load_module(name, pprint)
self.assertEqual(loaded.__name__, name)
def test_distinct_from_original(self):
"""
L{load_module} returns a distinct object from the original module.
"""
loaded = load_module(str("copy"), pprint)
# Override repr in copy:
loaded.repr = lambda o: str("OVERRIDE")
# Demonstrate that override applies to copy but not original:
self.assertEqual(
dict(original=pprint.pformat(123), loaded=loaded.pformat(123)),
dict(original="123", loaded="OVERRIDE"),
)
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