def test_load_empty_cache(self, mocker):
wrapped = MemoryDataSet(-42)
mocker.spy(wrapped, "load")
cached_ds = CachedDataSet(wrapped)
mocker.spy(cached_ds._cache, "load")
assert cached_ds.load() == -42
assert wrapped.load.call_count == 1
assert cached_ds._cache.load.call_count == 0
def test_save_load_caching(self, mocker):
wrapped = MemoryDataSet(-42)
mocker.spy(wrapped, "load")
mocker.spy(wrapped, "save")
cached_ds = CachedDataSet(wrapped)
mocker.spy(cached_ds._cache, "save")
mocker.spy(cached_ds._cache, "load")
cached_ds.save(42)
assert cached_ds.load() == 42
assert wrapped.load.call_count == 0
assert wrapped.save.call_count == 1
assert cached_ds._cache.load.call_count == 1
assert cached_ds._cache.save.call_count == 1