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_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_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)