reset method
void
reset()
Clears all data and re-seeds with default fixture data.
Equivalent to constructing a fresh MockDataSource()..seedDefaults().
Implementation
void reset() {
_documents.clear();
_versions.clear();
_versionData.clear();
_media.clear();
_publishedDataStore.clear();
_nextDocId = 1;
_nextVersionId = 1;
_nextMediaId = 1;
seedDefaults();
}