def test_replace_source_not_found():
source_a = DictConfigSource({})
source_b = DictConfigSource({})
config = Config()
config.add_source(source_a)
with pytest.raises(ValueError):
config.replace_source(source_b, source_a)
def test_replace_source():
sources = [DictConfigSource({}), DictConfigSource({})]
config = Config(sources=sources)
assert config.config_sources == sources
assert config.config_sources[0] is sources[0]
assert config.config_sources[1] is sources[1]
replacement_source = DictConfigSource({})
config.replace_source(sources[0], replacement_source)
assert config.config_sources == [replacement_source, sources[1]]
assert config.config_sources[0] is replacement_source
assert config.config_sources[1] is sources[1]
def test_replace_source_bad_type():
source = DictConfigSource({})
config = Config(sources=[source])
with pytest.raises(TypeError):
bad_type: ConfigSource = 3
config.replace_source(source, bad_type)