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# Copyright (c) 2010 Jonathan M. Lange. See LICENSE for details.
from testtools import TestCase
from testtools.helpers import (
try_import,
try_imports,
)
from testtools.matchers import (
Equals,
Is,
)
class TestTryImport(TestCase):
def test_doesnt_exist(self):
# try_import('thing', foo) returns foo if 'thing' doesn't exist.
marker = object()
result = try_import('doesntexist', marker)
self.assertThat(result, Is(marker))
def test_None_is_default_alternative(self):
# try_import('thing') returns None if 'thing' doesn't exist.
result = try_import('doesntexist')
self.assertThat(result, Is(None))
def test_existing_module(self):
# try_import('thing', foo) imports 'thing' and returns it if it's a
# module that exists.
result = try_import('os', object())
import os
self.assertThat(result, Is(os))
def test_existing_submodule(self):
# try_import('thing.another', foo) imports 'thing' and returns it if
# it's a module that exists.
result = try_import('os.path', object())
import os
self.assertThat(result, Is(os.path))
def test_nonexistent_submodule(self):
# try_import('thing.another', foo) imports 'thing' and returns foo if
# 'another' doesn't exist.
marker = object()
result = try_import('os.doesntexist', marker)
self.assertThat(result, Is(marker))
def test_object_from_module(self):
# try_import('thing.object') imports 'thing' and returns
# 'thing.object' if 'thing' is a module and 'object' is not.
result = try_import('os.path.join')
import os
self.assertThat(result, Is(os.path.join))
class TestTryImports(TestCase):
def test_doesnt_exist(self):
# try_imports('thing', foo) returns foo if 'thing' doesn't exist.
marker = object()
result = try_imports(['doesntexist'], marker)
self.assertThat(result, Is(marker))
def test_fallback(self):
result = try_imports(['doesntexist', 'os'])
import os
self.assertThat(result, Is(os))
def test_None_is_default_alternative(self):
# try_imports('thing') returns None if 'thing' doesn't exist.
e = self.assertRaises(
ImportError, try_imports, ['doesntexist', 'noreally'])
self.assertThat(
str(e),
Equals("Could not import any of: doesntexist, noreally"))
def test_existing_module(self):
# try_imports('thing', foo) imports 'thing' and returns it if it's a
# module that exists.
result = try_imports(['os'], object())
import os
self.assertThat(result, Is(os))
def test_existing_submodule(self):
# try_imports('thing.another', foo) imports 'thing' and returns it if
# it's a module that exists.
result = try_imports(['os.path'], object())
import os
self.assertThat(result, Is(os.path))
def test_nonexistent_submodule(self):
# try_imports('thing.another', foo) imports 'thing' and returns foo if
# 'another' doesn't exist.
marker = object()
result = try_imports(['os.doesntexist'], marker)
self.assertThat(result, Is(marker))
def test_fallback_submodule(self):
result = try_imports(['os.doesntexist', 'os.path'])
import os
self.assertThat(result, Is(os.path))
def test_suite():
from unittest import TestLoader
return TestLoader().loadTestsFromName(__name__)
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