def test_failover_in_case_of_exception():
class Iterator(object):
def __iter__(self):
raise FileNotFoundError()
file = Substitute()
file.yields(Iterator())
hosts = Hostnames(config=file, default=['a', 'b'])
assert_equal(list(hosts._hosts()), ['a', 'b'])
def test_call_method_returns_none():
'''Substitute: How to call a method on a substitute'''
# System under Test
substitute = Substitute()
# Act: Run
data = substitute.method()
# Assert
assert_equal(data, None)
def test_call_method_can_raise_an_exception():
'''Substitute: How to raise exceptions'''
# System under Test
substitute = Substitute()
# Act: Configure
substitute.method.raises(Apology)
# Act: Run
substitute.method()
def test_call_intercepts_many_arguments():
'''Substitute: When a call had many arguments, they are returned as a tuple'''
# System under Test
substitute = Substitute()
# Act: Run
data = substitute.method('hello', 1, 2, 3)
# Assert
assert_equal(substitute.method.args, ('hello', 1, 2, 3))
def test_call_intercepts_single_argument():
'''Substitute: How to intercept the arguments of a call'''
# System under Test
substitute = Substitute()
# Act: Run
data = substitute.method('hello')
# Assert
assert_equal(substitute.method.args, 'hello')
def test_call_method_on_substitute():
'''Substitute: How to verify that a method was called'''
# System under Test
substitute = Substitute()
# Act: Run
substitute.method()
# Assert
assert_true(substitute.method.was_called)
assert_false(substitute.other_method.was_called)
def test_call_intercepts_argument_tuples():
'''Substitute: How to intercept method arguments'''
# System under Test
substitute = Substitute()
# Act: Run
substitute.method(0, [])
# Assert
assert_equal(substitute.method.args, (0, []))
assert_true(substitute.method.was_called_with(0, []))
def test_yields():
'''Substitute: How to provide data for iteration'''
# System under Test
substitute = Substitute()
# Act: Configure
substitute.yields(['a', 'b', 'c'])
# Act: Run
result = list(substitute)
# Assert
assert_equal(result, ['a', 'b', 'c'])
def test_set_substitute_method():
'''Substitute: Properties containing functions are methods'''
# System under Test
substitute = Substitute()
# Act: Configure
substitute.name = lambda: 1
# Act: Run
name = substitute.name()
# Assert
assert_equal(name, 1)
def test_set_substitute_property():
'''Substitute: How to provide data from a property'''
# System under Test
substitute = Substitute()
# Act: Configure
substitute.name = 'Johannes'
# Act: Run
name = substitute.name
# Assert
assert_equal(name, 'Johannes')
def test_call_method_can_return_data():
'''Substitute: How to provide data from a method'''
# System under Test
substitute = Substitute()
# Act: Configure
substitute.method.returns(1)
# Act: Run
data = substitute.method()
# Assert
assert_equal(data, 1)
def test_ignore_tokens():
lexer = Substitute()
lexer.yields([Number(3.1415), NewLine(), Comment('Test'), Number(3.1415)])
expected_tokens = [
Number(3.1415),
Number(3.1415),
]
# System under Test
tokens = IgnoreTokens(lexer, tokens=[Comment, NewLine])
# Assert
tokens = list(tokens)
assert_equal(tokens, expected_tokens)
def test_call_intercepts_asserts_arguments():
'''Substitute: How to verify that a method was called with specific arguments'''
# System under Test
substitute = Substitute()
# Act: Configure
substitute.method.returns(1)
# Act: Run
data = substitute.method('hello')
# Assert
assert_true(substitute.method.was_called_with('hello'))
assert_false(substitute.method.was_called_with('bye'))
def test_substitute_nothing_happened():
'''Substitute: New substitutes do nothing'''
# System under Test
substitute = Substitute()
# Assert
assert_false(substitute.method.was_called)
def test_substitute_dictionaries_can_use_get_normally():
'''Substitute: How to use dict.get'''
# Arrange
key = 'key'
value = 42
# System under Test
substitute = Substitute()
# Act: Configure
substitute.get.returns(42)
# Act: Run
actual_value = substitute.get('key', None)
# Assert
assert_equal(actual_value, 42)
def test_substitute_dictionaries_return_configured_dictionary_values():
'''Substitute: dict.get returns values configured by __setitem__'''
# Arrange
key = 'key'
value = 42
# System under Test
substitute = Substitute()
# Act: Configure
substitute[key] = value
# Act: Run
actual_value = substitute.get('key', None)
# Assert
assert_equal(actual_value, 42)
def test_substitute_dictionaries_raise_keyerrors():
'''Substitute: Dictionary substitutes raise key errors like normal'''
# Arrange
key = 'key'
value = 42
# System under Test
substitute = Substitute()
# Act: Run
actual_value = substitute['key']
def test_substitute_dictionaries_but_only_if_configured():
'''Substitute: dict.get returns nothing if the value was not configured with __setitem__'''
# Arrange
key = 'key'
value = 42
# System under Test
substitute = Substitute()
# Act: Run, No Default
actual_value = substitute.get('key')
# Assert
assert_equal(actual_value, None)
# Act: Run, With Default
actual_value = substitute.get('key', 1)
# Assert
assert_equal(actual_value, 1)
def test_substitute_dictionaries_can_have_defaults():
'''Substitute: How to configure dictionary default values'''
# Arrange
key = 'key'
value = 42
# System under Test
substitute = Substitute()
# Act: Configure
substitute.setdefault("DEFAULT")
substitute[key] = value
# Act: Run
actual_value = substitute['key']
# Assert
assert_equal(actual_value, 42)
# Act: Run
actual_value = substitute['inexistent_key']
# Assert --> Default
assert_equal(actual_value, "DEFAULT")
def test_substitutes_can_act_as_dictionaries():
'''Substitute: How to subsitute a dictionary'''
# Arrange
key = 'key'
value = 42
# System under Test
substitute = Substitute()
# Act: Configure
substitute[key] = value
# Act: Run
actual_value = substitute['key']
# Assert
assert_equal(actual_value, 42)
def test_call_intercepts_several_arguments():
'''Substitute: When a method was called several times, all arguments are stored'''
# System under Test
substitute = Substitute()
# Act: Run
substitute.method('hello')
substitute.method('bye')
# Assert
assert_true(substitute.method.was_called_with('hello'))
assert_true(substitute.method.was_called_with('bye'))
def test_calls_are_counted():
'''Substitute: How to verify that a method was called several times'''
# System under Test
substitute = Substitute()
# Arrange
substitute.method()
assert_true(substitute.method.was_called)
assert_false(substitute.method.was_called_times(2))
# Act: Run
substitute.method()
# Assert
assert_true(substitute.method.was_called)
assert_true(substitute.method.was_called_times(2))
def test_substitute():
'''Substitute: How to create a Substitute'''
# System under Test
substitute = Substitute()