Test Coveragegood first issue
描述
gocov test -coverpkg=./graph/iterator . | gocov report shows we cover the base iterators in our integration test with a code coverage of 53.45% (as of this writing). Most of these come from lack of testing the Optional iterator or the Or iterator.
Simple enough: add some (hopefully grunty) integration/benchmark queries to cayley_test.go and raise this number considerably.