def test_src_always_in_output(dest, src):
try:
merged = merge(dest, src)
except ValueError:
assume(False)
src_paths = set(paths(src))
merged_paths = set(paths(merged))
for path in src_paths:
assert path in merged_paths
assert get(merged, path) == get(src, path)
def test_dest_in_merged_if_no_overwritten(dest, src):
try:
merged = merge(dest, src)
except ValueError:
assume(False)
dest_paths = set(paths(dest))
src_paths = set(paths(src))
merged_paths = set(paths(merged))
for path in dest_paths:
if path not in src_paths:
assert path in merged_paths
assert get(merged, path) == get(dest, path)
def test_merge_returns_new_dict():
dest = {}
src = {}
m = merge(dest, src)
assert m is not dest
assert m is not src
def test_incompatible_structures_raise_ValueError():
with pytest.raises(ValueError):
merge({'': 0}, {'': {}})
with pytest.raises(ValueError):
merge({'': {}}, {'': 0})
def test_empty_first(config):
assert merge({}, config) == config
def test_empty_second(config):
assert merge(config, {}) == config
def test_merge_empty():
assert merge({}, {}) == {}