public function itCachesResultsToSaveTheRainForestAndKittens()
 {
     expect($this->dao)->searchByArtifactId()->once();
     $this->retriever->getRawMailThatCreatedArtifact($this->artifact_by_mail);
     $this->retriever->getRawMailThatCreatedChangeset($this->changeset_by_mail);
     $this->retriever->getRawMailThatCreatedChangeset($this->other_changeset_by_mail);
 }